WHAT ARE SUSPENSION BUSHES AND WHAT DO THEY DO?
Suspension bushes are pieces of material, generally rubber, that are fitted where the suspension arms are bolted to the chassis. Along with the springs and shock absorbers, they dampen noise, vibration and harshness (NVH) picked up from the roads. So, why fit Polybush?
Even from new, a rubber bush that is identical in shape, size and material hardness to Polybush will deflect and deform during braking and cornering even more than its polyurethane counterpart, changing your suspension alignment. Polybush's longerchain chemical bonds give greater strength which resists this movement and requires more force to move. This is due to its high Young's modulus (which is a mechanical property)
