What Is a Shock Absorbers?
Shock absorbers — also called dampers — are hydraulic or gas-pressurised cylinders that control the rate at which the suspension compresses and extends. They work alongside the coil springs (which support vehicle weight) to control suspension movement. Inside the damper, fluid is forced through precisely calibrated valves as the piston moves, creating resistance that dissipates the energy of suspension movement as heat. Most modern vehicles use monotube or twin-tube gas-pressurised dampers.
What Does the Shock Absorbers Do?
Without shock absorbers, a vehicle with coil springs would bounce continuously after hitting a bump, making it impossible to control. The damper controls both the compression stroke (when hitting a bump) and the rebound stroke (as the suspension returns), keeping the tyre in contact with the road surface at all times. Worn dampers increase stopping distances, reduce cornering stability and cause uneven tyre wear.
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Get My Free Fault Scan →Symptoms of a Failing Shock Absorbers
Worn shock absorbers cause excessive body roll in corners, nose-diving under braking, rear squatting under acceleration, bouncing or wallowing over bumps, cupped or uneven tyre wear, and a general vague or floaty handling feel. A simple test is the bounce test — push down firmly on each corner of the car and release. The body should return to rest after one bounce. If it continues to oscillate, the damper may be worn.
When Should the Shock Absorbers Be Replaced?
Shock absorbers should be inspected every 30,000 to 50,000 miles and replaced in axle pairs when worn. Always replace front or rear as a pair — mixing worn and new units causes unpredictable handling. Replacement cost ranges from £150 to £400 per axle including labour.
If you are experiencing symptoms related to your shock absorbers and are unsure whether it needs replacing, a free MotorLoom fault scan can help identify whether the component is likely at fault - giving you the most likely cause and estimated repair cost before you visit a garage.
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Related Parts
Other components that work alongside or are related to the shock absorbers: