Description
Introduction： For Escalade Suburban Yukon Tahoe Front L/R Strut Assys Shock Absorber 84176631 Introduction： Two front Air Suspesnion shock absorbers are connected from the front suspension to the chassis, and two rear Air Suspension shock absorbers are attached between the rear suspension and the chassis. Shock absorbers have three main purposes: 1. They control spring action and oscillations to provide the desired ride quality. 2. They help prevent body sway and lean while cornering. 3. They reduce the tendency of a tire tread to lift off the road, which improves tire life, traction, and directional stability. Because Air suspension shock absorbers control spring action, spring oscillations, and chassis oscillations, they contribute to vehicle safety and passenger comfort. If the shock absorbers are worn out, excessive chassis oscillations may occur, particularly on rough road surfaces. Th ese excessive chassis oscillations may result in loss of steering control. Worn-out shock absorbers also cause excessive body lean and sway while cornering, which may cause the driver to lose control of the vehicle. Shock absorbers are extremely important to providing longer tire life and improving vehicle handling, steering quality, and ride quality. Air suspension Shock absorber design is matched to the defl ection rate of the coil spring to control the spring action. Several diff erent types of shock absorbers are available for special service requirements. Fitting the Following vehicle: Cadillac Cadillac Escalade Base 6.2L 2015-2020 Cadillac Escalade ESV Base 6.2L 2015-2020 Cadillac Escalade ESV Luxury 6.2L 2015-2020 Cadillac Escalade ESV Platinum 6.2L 2015-2020 Cadillac Escalade ESV Premium 6.2L 2015-2020 Cadillac Escalade Luxury 6.2L 2015-2020 Cadillac Escalade Platinum 6.2L 2015-2020 Cadillac Escalade Premium 6.2L 2015-2020 Chevrolet Chevrolet Silverado 1500 Base 4.3L 2014 Chevrolet Silverado 1500 Custom 4.3L 2016-2019 Chevrolet Silverado 1500 Custom 5.3L 2016-2019 Chevrolet Silverado 1500 High 5.3L 2014-2019 Chevrolet Silverado 1500 High 6.2L 2014-2019 Chevrolet Silverado 1500 LD Custom 5.3L 2019 Chevrolet Silverado 1500 LD LT 5.3L 2019 Chevrolet Silverado 1500 LD WT 5.3L 2019 Chevrolet Silverado 1500 LS 4.3L 2015-2018 Chevrolet Silverado 1500 LS 5.3L 2015-2018 Chevrolet Silverado 1500 LT 2.7L 2019 Chevrolet Silverado 1500 LT 4.3L 2014-2018 Chevrolet Silverado 1500 LT 5.3L 2014-2019 Chevrolet Silverado 1500 LTZ 5.3L 2014-2019 Chevrolet Silverado 1500 LTZ 6.2L 2014-2019 Chevrolet Silverado 1500 RST 2.7L 2019 Chevrolet Silverado 1500 RST 5.3L 2019 Chevrolet Silverado 1500 SSV 5.3L 2015-2019 Chevrolet Silverado 1500 WT 4.3L 2014-2019 Chevrolet Silverado 1500 WT 5.3L 2014-2019 Chevrolet Suburban HD 6.0L 2016-2019 Chevrolet Suburban LS 5.3L 2015-2020 Chevrolet Suburban LT 5.3L 2015-2020 Chevrolet Suburban LTZ 5.3L 2015-2016 Chevrolet Suburban Premier 5.3L 2017-2020 Chevrolet Suburban Premier 6.2L 2019-2020 Chevrolet Tahoe Commercial -- 2018 Chevrolet Tahoe LS 5.3L 2015-2020 Chevrolet Tahoe LT 5.3L 2015-2020 Chevrolet Tahoe LTZ 5.3L 2015-2016 Chevrolet Tahoe Midnight 5.3L 2018 Chevrolet Tahoe PPV 5.3L 2015-2020 Chevrolet Tahoe Police 5.3L 2017-2018 Chevrolet Tahoe Premier 5.3L 2017-2020 Chevrolet Tahoe Premier 6.2L 2018-2020 Chevrolet Tahoe SSV 5.3L 2015-2020 Chevrolet Tahoe Z71 5.3L 2016-2017 GMC GMC Sierra 1500 AT4 5.3L 2019 GMC Sierra 1500 AT4 6.2L 2019 GMC Sierra 1500 Base 2.7L 2019 GMC Sierra 1500 Base 4.3L 2014-2019 GMC Sierra 1500 Base 5.3L 2014-2019 GMC Sierra 1500 Denali 5.3L 2014-2019 GMC Sierra 1500 Denali 6.2L 2014-2019 GMC Sierra 1500 Elevation 2.7L 2019 GMC Sierra 1500 Elevation 5.3L 2019 GMC Sierra 1500 SLE 2.7L 2019 GMC Sierra 1500 SLE 4.3L 2014-2018 GMC Sierra 1500 SLE 5.3L 2014-2019 GMC Sierra 1500 SLT 5.3L 2014-2019 GMC Sierra 1500 SLT 6.2L 2014-2019 GMC Yukon Denali 6.2L 2015-2020 GMC Yukon SLE 5.3L 2015-2020 GMC Yukon SLT 5.3L 2015-2020 GMC Yukon SLT 6.2L 2019-2020 GMC Yukon XL Denali 6.2L 2015-2020 GMC Yukon XL SLE 5.3L 2015-2020 GMC Yukon XL SLT 5.3L 2015-2020 GMC Yukon XL SLT 6.2L 2019-2020 Evolution Related ： Cadillac Escalade GMT400 First generation (1999-2000) GMT800 Second generation (2002-2006) GMT900 Third generation (2007-2014) GMTK2XL Fourth generation (2015-present) Chevrolet Avalanche GMT800 First generation (2001-2006) GMT900 Second generation (2007-2013) Chevrolet Suburban First generation (1935-1940) Second generation (1941-1946) Third generation (1947-1954) Fourth generation (1955-1959) Fifth generation (1960-1966) Sixth generation (1967-1972) Seventh generation (1973-1991) Eighth generation (1992-1999) Ninth generation (2000-2006) Tenth generation (2007-2014) Eleventh generation (2015-present) Chevrolet Tahoe GMT400 First generation (1992-2000) GMT800 Second generation (2000-2006) GMT900 Third generation (2007-2014) GMTK2UC/G Fourth generation (2015-present) GMC Yukon Rebadged Version of Chevrolet Tahoe GMT400 First generation (1992-2000) GMT800 Second generation (2000-2006) GMT900 Third generation (2007-2014) GMTK2UC/G Fourth generation (2015-present) Advantage of Our Air Suspension: -The Original Size -Direct Replacement -Perfect Fit -Safe and Stable -Longer Life -Eliminating abnormal sound -After-sales Guarantee -Made of high quality raw materials, effectively reduce air leakage, strong sealing -All parts are hand inspected off the line before packaging and once again by our team before shipment -It has a high compressive strength and good sound insulation to ensure our driving comfort and safety If you are interested with any other air suspension parts, please click and save our store When Should We Replace Air Suspension: The car was subjected to excessive up, down, and left/right vibrations, nods during braking, and irregular tire wear An excessive tilt or swing of a car in a turn Wear or damage of final assembly housing, resulting in oil leakage of air suspension and affecting its performance If the car vibrates violently when it comes to an emergency stop while moving slowly Common Air Suspension Failure Inspection: 1.Abnormal Sounds When the air suspension strut is damaged,it will give out an abnormal sound. 2.Poor Handling Stability When the car passes over a rough road ,it bumps and cannot keep steady. 3.Air Leakage Leaking air、seal gasket failed. 4.Car Body Slant Under the condition of poor road (Bumpy Road),the body will collapse. 5.Irregular Tire Wear The air suspension sturt needs to be replaced if tyre surface has uneven wear marks. 6.Over Bend When you turn to brakes,tilt faster and the steering wheel will fail. Recommended replacement cycle: Since the average annual distance of the car is 20,000 kilometers, the replacement frequency is obtained every 4 years or 80.000km. In fact, the replacement frequency will vary depending on the car condition, road condition and shock absorber manufacturer.When driving a certain number of kilometers, we should take corresponding measures to ensure our driving safety. 20.000km: Please check your air suspension 80.000km: Need to replace your air suspension 100.000km: Please replace your air suspension as soon as possible OEM Part Number: 84176631，84061228 84977478, 23312167 23464589, 23151123 Air Suspension Shock Absorber Operation: Air Suspension Shock absorbers are usually mounted between the lower control arms and the chassis. When a vehicle wheel strikes a bump, the wheel and suspension move upward in relation to the chassis. Upward wheel movement is referred to as jounce travel. Th is jounce action causes the spring to deflect or compress. Under this condition, the spring stores energy and springs back downward with all the energy absorbed when it defl ected upward. Th is downward spring and wheel action is called rebound travel. If this spring action were not controlled, the wheel would strike the road with a strong downward force, and the wheel jounce would occur again. Th erefore, some device must be installed to control the spring action, or the wheelwould bounce up and down many times after it hit a bump, causing passenger discomfort, directional instability, and suspension component wear. Shock absorbers are installed on suspension systems to control spring action. When a wheel strikes a bump and jounce travel occurs, the shock absorber lower tube unit is forced upward. Th is action forces the piston downward in the lower tube unit. Since oil cannot leak past the piston, the oil in the lower unit is forced through the piston orifi ces or valves to the upper oil chamber. These valves provide precise oil fl ow control and control the upward action of the wheel and suspension, which is referred to as a shock absorber compression stroke (Figure 5-2). When the spring expands downward in rebound travel, the lower shock absorber unit is also forced downward. When this occurs, the piston moves upward in the lower tube unit, and hydraulic oil is forced through the piston orifi ces or valves from the upper oil chamber to the lower oil chamber. Since the valves restrict oil flow with precise control, the downward suspension and wheel movement is controlled. When the shock absorber piston moves, oil is forced through the piston. Since the piston valves and orifi ces resist the fl ow of oil, friction and heat are created. Th e resistance of the oil moving through the piston must be calibrated as closely as possible to the spring’s deflection rate or strength. Wheels and suspension systems defl ect at many diff erent speeds, depending on the type and size of bump and the vehicle speed. Th e resistance of a shock absorber piston increases with the square of its speed. For example, if the wheel defl ection speed increases four times, the piston resistance is sixteen times as great. Th erefore, if a wheel strikes a large bump at high speed, the wheel defl ection and rebound can be eff ectively locked by the shock absorber. Shock absorber engineers prevent this action by precisely designing shock absorbervalves and orifi ces to provide enough friction to prevent the spring from overextending on the rebound stroke. Th ese piston valves and orifi ces must not create excessive friction, which slows the wheel from returning to its original position. Shock absorber pistons have many diff erent types of valves and orifi ces. In some pistons, small orifi ces control the oil flow during slow wheel and suspension movements. Stacked steel valves control the oil fl ow during medium speed wheel and suspension movements. During maximum wheel and suspension movements, larger orifi ces between the piston valves provide oil fl ow control. On other shock absorber pistons, the stacked steel valves alone provide oil flow control. Regardless of the piston orifi ce and valve design, the shock absorber must be precisely matched to absorb the spring’s energy. During fast upward wheel movement on the compression stroke, excessive pressure in the lower oil chamber forces the base valve open and thus allows oil to fl ow through this valve to the reservoir. Th e nitrogen gas provides a compensating space for the oil that is displaced into the reservoir on the compression stroke and when the oil is heated. Since the gas exerts pressure on the oil, cavitation, or foaming of the oil, is eliminated. When oil bubbles are eliminated in this way, the shock absorber provides continuous damping for wheel defl ections as small as 0.078 in (2.0 mm). A rebound rubber is located on top of the piston. If the wheel drops downward into a hole, the shock absorber may become fully extended. Under this condition, the rebound rubber provides a cushioning action. Package Includes: Single for Front Left or Right Air Suspension Shock Strut Notes : Of all the suspension components, shock absorbers and struts contribute the most to ride quality. As the vehicle is driven over road irregularities, the shock absorbers or struts are continually operating to control the spring action and provide acceptable ride quality. It has been my experience that shock absorbers and struts usually wear out fi rst in suspension systems, because they are working every time a wheel strikes a road irregularity. Th erefore, you must understand not only shock absorber and strut operation but also how ride quality is aff ected if these componen Please double confirm the compatibility as well as the OEM number before purchasing. Instruction is not included. Professional installation is recommended. Item Specifics Brand hqas-accessories Manufacturer Part Number HQ115300A01 Type Shock & Spring Assembly Placement on Vehicle Front Left Features Easy to Replace OE/OEM Part Number 84176631 Manufacturer Warranty 1 Year Material Iron Performance Part Yes Universal Fitment No Interchange Part Number 23464589 Superseded Part Number Air shock absorber Part Type Shock Absorber & Coil Spring Assembly Fitment Type Direct Replacement Adjustable Yes OE Spec or Performance/Custom OE Spec Surface Finish yes Items Included Shock Payment PayPal preferred. Payments are expected within 7 days after the last winning auction is closed; Otherwise Unpaid Item Dispute will be filed with eBay. Shipping Product will be shipped within 2 business days after full payment is received and verified. Delivery Time is about 3-7 business days to most of countries. All domestic orders will be shipped via USPS, UPS or FedEx from our US warehouse and usually arrives to your door in about 3-5 business days. We ship the package to your shipping address in eBay instead of the one in PayPal. Please tell us your shipping address if it is different from the one in eBay. The tracking number will be given for the customer to check the shipping status online (registered or faster service only). We are not responsible for any wrong or undeliverable addresses. Please verify and update your shipping address on eBay during checkout. Returns WARNING : Cancer and Reproductive Harm - www.P65Warnings.ca.gov. We stand behind every product we sell. All of our brand new items come with a 60-Days money-back guarantee. We define the item as defective only if it doesn't function as described. It is the buyer's responsibility to understand the item description before bidding. We will replace the defective items, provided that they are in stock within the warranty period posted with the listing and the buyer return the original item and pay for the S&H cost for the replacement. We will refund the purchase price if the replacement is not available or buyer prefers a refund and send the original item back at his/her own cost. Shipping & handling cost are not refundable. Man-made damage by abuse or wrong operation is not covered by this warranty. No product liability insurance is assumed. Contact Us Q: How do I pay for my purchase? A: MY store accepts PayPal. Q: When will the item be shipped out? A: This item will be shipped with 2 business day once payment completed. Q: Where is my tracking number? A: Please log on your account, click "my eBay"-->"my summary", or open your email box and find the shipping notification email. Q: How do I return an item? A: My tore accepts returns. Items must be returned within 60 days. Refunds will be given as money back. Please contact our customer service before you return an item. ] Q: How do I pay for my purchase? A: MY store accepts PayPal. Q: When will the item be shipped out? A: This item will be shipped with 2 business day once payment completed. Q: Where is my tracking number? A: Please log on your account, click "my eBay"-->"my summary", or open your email box and find the shipping notification email. Q: How do I return an item? A: My tore accepts returns. Items must be returned within 60 days. Refunds will be given as money back. Please contact our customer service before you return an item. ] We are dedicated to provide high quality products and satisfied customer service to our sincerely customers, so if there's any questions or problems with our products or service, feel free to contact us please. DESCRIPTION PAYMENT SHIPPING RETURN POLICY CONTACT US For Escalade Suburban Yukon Tahoe Front L/R Strut Assys Shock Absorber 84176631 Introduction： Two front Air Suspesnion shock absorbers are connected from the front suspension to the chassis, and two rear Air Suspension shock absorbers are attached between the rear suspension and the chassis. Shock absorbers have three main purposes: 1. They control spring action and oscillations to provide the desired ride quality. 2. They help prevent body sway and lean while cornering. 3. They reduce the tendency of a tire tread to lift off the road, which improves tire life, traction, and directional stability. Because Air suspension shock absorbers control spring action, spring oscillations, and chassis oscillations, they contribute to vehicle safety and passenger comfort. If the shock absorbers are worn out, excessive chassis oscillations may occur, particularly on rough road surfaces. Th ese excessive chassis oscillations may result in loss of steering control. Worn-out shock absorbers also cause excessive body lean and sway while cornering, which may cause the driver to lose control of the vehicle. Shock absorbers are extremely important to providing longer tire life and improving vehicle handling, steering quality, and ride quality. Air suspension Shock absorber design is matched to the defl ection rate of the coil spring to control the spring action. Several diff erent types of shock absorbers are available for special service requirements. Fitting the Following vehicle: Cadillac Cadillac Escalade Base 6.2L 2015-2020 Cadillac Escalade ESV Base 6.2L 2015-2020 Cadillac Escalade ESV Luxury 6.2L 2015-2020 Cadillac Escalade ESV Platinum 6.2L 2015-2020 Cadillac Escalade ESV Premium 6.2L 2015-2020 Cadillac Escalade Luxury 6.2L 2015-2020 Cadillac Escalade Platinum 6.2L 2015-2020 Cadillac Escalade Premium 6.2L 2015-2020 Chevrolet Chevrolet Silverado 1500 Base 4.3L 2014 Chevrolet Silverado 1500 Custom 4.3L 2016-2019 Chevrolet Silverado 1500 Custom 5.3L 2016-2019 Chevrolet Silverado 1500 High 5.3L 2014-2019 Chevrolet Silverado 1500 High 6.2L 2014-2019 Chevrolet Silverado 1500 LD Custom 5.3L 2019 Chevrolet Silverado 1500 LD LT 5.3L 2019 Chevrolet Silverado 1500 LD WT 5.3L 2019 Chevrolet Silverado 1500 LS 4.3L 2015-2018 Chevrolet Silverado 1500 LS 5.3L 2015-2018 Chevrolet Silverado 1500 LT 2.7L 2019 Chevrolet Silverado 1500 LT 4.3L 2014-2018 Chevrolet Silverado 1500 LT 5.3L 2014-2019 Chevrolet Silverado 1500 LTZ 5.3L 2014-2019 Chevrolet Silverado 1500 LTZ 6.2L 2014-2019 Chevrolet Silverado 1500 RST 2.7L 2019 Chevrolet Silverado 1500 RST 5.3L 2019 Chevrolet Silverado 1500 SSV 5.3L 2015-2019 Chevrolet Silverado 1500 WT 4.3L 2014-2019 Chevrolet Silverado 1500 WT 5.3L 2014-2019 Chevrolet Suburban HD 6.0L 2016-2019 Chevrolet Suburban LS 5.3L 2015-2020 Chevrolet Suburban LT 5.3L 2015-2020 Chevrolet Suburban LTZ 5.3L 2015-2016 Chevrolet Suburban Premier 5.3L 2017-2020 Chevrolet Suburban Premier 6.2L 2019-2020 Chevrolet Tahoe Commercial -- 2018 Chevrolet Tahoe LS 5.3L 2015-2020 Chevrolet Tahoe LT 5.3L 2015-2020 Chevrolet Tahoe LTZ 5.3L 2015-2016 Chevrolet Tahoe Midnight 5.3L 2018 Chevrolet Tahoe PPV 5.3L 2015-2020 Chevrolet Tahoe Police 5.3L 2017-2018 Chevrolet Tahoe Premier 5.3L 2017-2020 Chevrolet Tahoe Premier 6.2L 2018-2020 Chevrolet Tahoe SSV 5.3L 2015-2020 Chevrolet Tahoe Z71 5.3L 2016-2017 GMC GMC Sierra 1500 AT4 5.3L 2019 GMC Sierra 1500 AT4 6.2L 2019 GMC Sierra 1500 Base 2.7L 2019 GMC Sierra 1500 Base 4.3L 2014-2019 GMC Sierra 1500 Base 5.3L 2014-2019 GMC Sierra 1500 Denali 5.3L 2014-2019 GMC Sierra 1500 Denali 6.2L 2014-2019 GMC Sierra 1500 Elevation 2.7L 2019 GMC Sierra 1500 Elevation 5.3L 2019 GMC Sierra 1500 SLE 2.7L 2019 GMC Sierra 1500 SLE 4.3L 2014-2018 GMC Sierra 1500 SLE 5.3L 2014-2019 GMC Sierra 1500 SLT 5.3L 2014-2019 GMC Sierra 1500 SLT 6.2L 2014-2019 GMC Yukon Denali 6.2L 2015-2020 GMC Yukon SLE 5.3L 2015-2020 GMC Yukon SLT 5.3L 2015-2020 GMC Yukon SLT 6.2L 2019-2020 GMC Yukon XL Denali 6.2L 2015-2020 GMC Yukon XL SLE 5.3L 2015-2020 GMC Yukon XL SLT 5.3L 2015-2020 GMC Yukon XL SLT 6.2L 2019-2020 Evolution Related ： Cadillac Escalade GMT400 First generation (1999-2000) GMT800 Second generation (2002-2006) GMT900 Third generation (2007-2014) GMTK2XL Fourth generation (2015-present) Chevrolet Avalanche GMT800 First generation (2001-2006) GMT900 Second generation (2007-2013) Chevrolet Suburban First generation (1935-1940) Second generation (1941-1946) Third generation (1947-1954) Fourth generation (1955-1959) Fifth generation (1960-1966) Sixth generation (1967-1972) Seventh generation (1973-1991) Eighth generation (1992-1999) Ninth generation (2000-2006) Tenth generation (2007-2014) Eleventh generation (2015-present) Chevrolet Tahoe GMT400 First generation (1992-2000) GMT800 Second generation (2000-2006) GMT900 Third generation (2007-2014) GMTK2UC/G Fourth generation (2015-present) GMC Yukon Rebadged Version of Chevrolet Tahoe GMT400 First generation (1992-2000) GMT800 Second generation (2000-2006) GMT900 Third generation (2007-2014) GMTK2UC/G Fourth generation (2015-present) Advantage of Our Air Suspension: -The Original Size -Direct Replacement -Perfect Fit -Safe and Stable -Longer Life -Eliminating abnormal sound -After-sales Guarantee -Made of high quality raw materials, effectively reduce air leakage, strong sealing -All parts are hand inspected off the line before packaging and once again by our team before shipment -It has a high compressive strength and good sound insulation to ensure our driving comfort and safety If you are interested with any other air suspension parts, please click and save our store When Should We Replace Air Suspension: The car was subjected to excessive up, down, and left/right vibrations, nods during braking, and irregular tire wear An excessive tilt or swing of a car in a turn Wear or damage of final assembly housing, resulting in oil leakage of air suspension and affecting its performance If the car vibrates violently when it comes to an emergency stop while moving slowly Common Air Suspension Failure Inspection: 1.Abnormal Sounds When the air suspension strut is damaged,it will give out an abnormal sound. 2.Poor Handling Stability When the car passes over a rough road ,it bumps and cannot keep steady. 3.Air Leakage Leaking air、seal gasket failed. 4.Car Body Slant Under the condition of poor road (Bumpy Road),the body will collapse. 5.Irregular Tire Wear The air suspension sturt needs to be replaced if tyre surface has uneven wear marks. 6.Over Bend When you turn to brakes,tilt faster and the steering wheel will fail. Recommended replacement cycle: Since the average annual distance of the car is 20,000 kilometers, the replacement frequency is obtained every 4 years or 80.000km. In fact, the replacement frequency will vary depending on the car condition, road condition and shock absorber manufacturer.When driving a certain number of kilometers, we should take corresponding measures to ensure our driving safety. 20.000km: Please check your air suspension 80.000km: Need to replace your air suspension 100.000km: Please replace your air suspension as soon as possible OEM Part Number: 84176631，84061228 84977478, 23312167 23464589, 23151123 Air Suspension Shock Absorber Operation: Air Suspension Shock absorbers are usually mounted between the lower control arms and the chassis. When a vehicle wheel strikes a bump, the wheel and suspension move upward in relation to the chassis. Upward wheel movement is referred to as jounce travel. Th is jounce action causes the spring to deflect or compress. Under this condition, the spring stores energy and springs back downward with all the energy absorbed when it defl ected upward. Th is downward spring and wheel action is called rebound travel. If this spring action were not controlled, the wheel would strike the road with a strong downward force, and the wheel jounce would occur again. Th erefore, some device must be installed to control the spring action, or the wheelwould bounce up and down many times after it hit a bump, causing passenger discomfort, directional instability, and suspension component wear. Shock absorbers are installed on suspension systems to control spring action. When a wheel strikes a bump and jounce travel occurs, the shock absorber lower tube unit is forced upward. Th is action forces the piston downward in the lower tube unit. Since oil cannot leak past the piston, the oil in the lower unit is forced through the piston orifi ces or valves to the upper oil chamber. These valves provide precise oil fl ow control and control the upward action of the wheel and suspension, which is referred to as a shock absorber compression stroke (Figure 5-2). When the spring expands downward in rebound travel, the lower shock absorber unit is also forced downward. When this occurs, the piston moves upward in the lower tube unit, and hydraulic oil is forced through the piston orifi ces or valves from the upper oil chamber to the lower oil chamber. Since the valves restrict oil flow with precise control, the downward suspension and wheel movement is controlled. When the shock absorber piston moves, oil is forced through the piston. Since the piston valves and orifi ces resist the fl ow of oil, friction and heat are created. Th e resistance of the oil moving through the piston must be calibrated as closely as possible to the spring’s deflection rate or strength. Wheels and suspension systems defl ect at many diff erent speeds, depending on the type and size of bump and the vehicle speed. Th e resistance of a shock absorber piston increases with the square of its speed. For example, if the wheel defl ection speed increases four times, the piston resistance is sixteen times as great. Th erefore, if a wheel strikes a large bump at high speed, the wheel defl ection and rebound can be eff ectively locked by the shock absorber. Shock absorber engineers prevent this action by precisely designing shock absorbervalves and orifi ces to provide enough friction to prevent the spring from overextending on the rebound stroke. Th ese piston valves and orifi ces must not create excessive friction, which slows the wheel from returning to its original position. Shock absorber pistons have many diff erent types of valves and orifi ces. In some pistons, small orifi ces control the oil flow during slow wheel and suspension movements. Stacked steel valves control the oil fl ow during medium speed wheel and suspension movements. During maximum wheel and suspension movements, larger orifi ces between the piston valves provide oil fl ow control. On other shock absorber pistons, the stacked steel valves alone provide oil flow control. Regardless of the piston orifi ce and valve design, the shock absorber must be precisely matched to absorb the spring’s energy. During fast upward wheel movement on the compression stroke, excessive pressure in the lower oil chamber forces the base valve open and thus allows oil to fl ow through this valve to the reservoir. Th e nitrogen gas provides a compensating space for the oil that is displaced into the reservoir on the compression stroke and when the oil is heated. Since the gas exerts pressure on the oil, cavitation, or foaming of the oil, is eliminated. When oil bubbles are eliminated in this way, the shock absorber provides continuous damping for wheel defl ections as small as 0.078 in (2.0 mm). A rebound rubber is located on top of the piston. If the wheel drops downward into a hole, the shock absorber may become fully extended. Under this condition, the rebound rubber provides a cushioning action. Package Includes: Single for Front Left or Right Air Suspension Shock Strut Notes : Of all the suspension components, shock absorbers and struts contribute the most to ride quality. As the vehicle is driven over road irregularities, the shock absorbers or struts are continually operating to control the spring action and provide acceptable ride quality. It has been my experience that shock absorbers and struts usually wear out fi rst in suspension systems, because they are working every time a wheel strikes a road irregularity. Th erefore, you must understand not only shock absorber and strut operation but also how ride quality is aff ected if these componen Please double confirm the compatibility as well as the OEM number before purchasing. Instruction is not included. Professional installation is recommended. Payment Shipping Returns Contact Us PayPal preferred. Payments are expected within 7 days after the last winning auction is closed; Otherwise Unpaid Item Dispute will be filed with eBay. Product will be shipped within 2 business days after full payment is received and verified. Delivery Time is about 3-7 business days to most of countries. All domestic orders will be shipped via USPS, UPS or FedEx from our US warehouse and usually arrives to your door in about 3-5 business days. We ship the package to your shipping address in eBay instead of the one in PayPal. Please tell us your shipping address if it is different from the one in eBay. The tracking number will be given for the customer to check the shipping status online (registered or faster service only). We are not responsible for any wrong or undeliverable addresses. Please verify and update your shipping address on eBay during checkout. WARNING : Cancer and Reproductive Harm - www.P65Warnings.ca.gov. We stand behind every product we sell. All of our brand new items come with a 60-Days money-back guarantee. We define the item as defective only if it doesn't function as described. It is the buyer's responsibility to understand the item description before bidding. We will replace the defective items, provided that they are in stock within the warranty period posted with the listing and the buyer return the original item and pay for the S&H cost for the replacement. We will refund the purchase price if the replacement is not available or buyer prefers a refund and send the original item back at his/her own cost. Shipping & handling cost are not refundable. Man-made damage by abuse or wrong operation is not covered by this warranty. No product liability insurance is assumed. Q: How do I pay for my purchase? A: MY store accepts PayPal. Q: When will the item be shipped out? A: This item will be shipped with 2 business day once payment completed. Q: Where is my tracking number? A: Please log on your account, click "my eBay"-->"my summary", or open your email box and find the shipping notification email. Q: How do I return an item? A: My tore accepts returns. Items must be returned within 60 days. Refunds will be given as money back. Please contact our customer service before you return an item. ] Q: How do I pay for my purchase? A: MY store accepts PayPal. Q: When will the item be shipped out? A: This item will be shipped with 2 business day once payment completed. Q: Where is my tracking number? A: Please log on your account, click "my eBay"-->"my summary", or open your email box and find the shipping notification email. Q: How do I return an item? A: My tore accepts returns. Items must be returned within 60 days. Refunds will be given as money back. Please contact our customer service before you return an item. ] We are dedicated to provide high quality products and satisfied customer service to our sincerely customers, so if there's any questions or problems with our products or service, feel free to contact us please. All right reserved. 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