Common Shock /struts Absorber Questions
12. Why do I need to replace worn shocks or struts?
In a nutshell: To keep the vehicle’s stability within its designed capability. Stability means keeping the body as level as possible during bumps, turns and stops, while keeping the tyres on the road under all conditions. The shock’s main function is to resist body & tyre movement, but as shocks wear the vehicle becomes unstable; the steering feels less responsive, the body leans more and the tyres grip less. Stopping ability can be reduced as much as 23% and the driver needs more skill to keep the vehicle on the intended path and from losing control on curves. Shocks cycle about 1000 times per Km driven. After 80,000 Km, that’s 80 million cycles.Because shocks use metal discs that flex with each movement, they become fatigued over time which causes the reduced performance, which is why replacement shocks and struts are suggested after 80,000 kilometres.
13. What is the difference between shock absorbers and struts?
The function is essentially the same, but the largest difference is the way they mount to the vehicle. The strut design acts an integral part of the suspension by replacing the upper control arm and acting as a pivot point for the steering. The shock design is used in addition to the suspension and steering components.
14. Do the strut mounts come with the bearings?
Many do, but only when the strut mount is also the steering pivot. The bearing is a wear item and affects the steering response as well as wheel alignment.
15. Why should replacement spring always be fitted in axle pairs?
Although one spring may have broken and requires replacing, the other springs will be fatigued, and failure may be imminent. As with shock absorbers, replacing just one spring will result in an unbalanced axle which will manifest itself with uneven braking and handling.
16. Why do I need to check suspension geometry after fitting new springs?
As springs fatigue and sag, caster, camber, toe and the turning circle are affected, therefore, a full geometry check after fitting new springs will reduce wear in tyres, track rod ends etc.
17. Why are coil springs which come off a vehicle often longer than the new springs supplied as replacements?
Because the old springs have become coil bound. They have stopped returning to their original height following extensive compression.
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