Hydraulic suspension bushings were developed in response to specific customer desires: quieter and better-handling vehicles.
Let’s focus on identifying when control arms need to be replaced, and why they should always be replaced in pairs.
As the bushing ages, it acquires a “set” that is easily disturbed when a vehicle’s steering system is realigned. When this happens, the bushing begins to separate from its metal sleeve and becomes, in essence, a frictional wearing component.
With wide adoption of large diameter wheels and low-profile tires, suspensions on late-model vehicles have changed. The extra weight of larger wheels has meant that suspension components have had to go on a diet of aluminum. Less sidewall area has transferred the role of absorbing road impacts to larger bushings in order to achieve the same ride quality.