Change Car Shock Absorbers
The rear shock absorbers control the body movement relative to the wheels. Worn shock absorbers spoil the roadholding, lengthen the stopping distance and encourage uneven tyre wear, often without the driver noticing, because the deterioration is gradual.
Symptoms of shock absorbers needing replacement
Look out for the following signs: greater sensitivity to crosswinds, longer stopping distances, difficulty holding a line through bends (a floating feeling), or uneven tyre wear. Average life is around 80,000 km.
What to change at the same time
Replacement is always done in pairs to avoid an imbalance. It is advisable to replace all four shock absorbers at once. After the work, a wheel alignment is essential.
Key points for the replacement
Safety first
On rear axles with a semi-rigid (torsion) beam, never remove both shock absorbers at the same time: you risk damaging the brake hoses and the bushes.
Difficulty 2/5
At the rear, the shock absorbers are usually separate from the springs: technically easy, but needs a torque wrench.
Reference ride height
On refitting, before tightening to torque, set the vehicle at its reference ride height. Without this step, the bushes will wear out quickly.
Price
Average garage price: around £290 for a pair, excluding labour. Allow a further £40 to £80 for the wheel alignment.
Types of shock absorber
Hydraulic shock absorbers (twin-tube)
Two concentric tubes filled with oil. Proven technology, comfortable, suited to everyday use. This is the most common type on passenger cars.
Gas shock absorbers (monotube)
A single tube with a pressurised gas chamber. Better resistance to heat build-up, a firmer response. Preferred on sporty or heavily laden vehicles.
