Bushings isolate and reduce transmitted noise, road shock, and vibration.
When a vehicle is in motion, axial and radial movement of the suspension system, combined with the excess heat generated by the vehicle, cause the bushings to twist and stretch. These stresses can lead to hardening, cracking, and even breaking. This normal wear can be increased by rough road conditions, or by worn or defective shock absorbers, further shortening the life of the bushings.
Worn bushings can allow surrounding components to change positions often causing excessive noise in passenger cabin. Once bushings have begun to harden and crack, they must be replaced.
There are numerous types of bushings used in the manufacture of a vehicle. Some of the more common bushing types are:
- Control Arm - control arm bushings provide a pivot point from the control arm and maintain the lateral and vertical location of the control arm pivot points.
- Stabilizer Bar Frame - stabilizer bar bushings provide direct transmission of force from the sway bar to the body of the vehicle.
- Rack & Pinion Mount - rack and pinion mount bushings insulate road noise from the cabin of the vehicle and create a firm mounting point for the vehicle's steering system.
In a properly working bushing, the rubber portion of the bushing must allow the suspension system to twist and move in response to road conditions. Bushings that are in good condition act as a kind of sponge, absorbing vibration and motions with only minimal transmission to the passenger cabin. As a bushing wears, it will lose material and some of the sponge-like characteristics. A worn bushing will lead to excessive road noise and improper function of connected components.
Depending on the type of bushing, different materials such as rubber and polyurethane can be used in the design of the product. Many of the Mevotech X Factor bushings use polyurethane components in their design, providing enhanced corrosion resistance and an overall smoother ride for the driver.