Many mechanics throughout the US prefer using KYB shock bushings doing suspension projects. A big reason why is because a lot of automakers use KYB parts when assembling vehicles, so often, it is a matter of continuing on with similar part values. But even if the components are different, KYB shock bushings are still considered an industry standard. They are extremely durable and retain their effectiveness for more miles than most factory bushings. They are also available for a wide variety of vehicles. You can find KYB shock bushings for sedans, trucks, and SUVs.
The design is the first order of importance. KYB manufactures their shock absorber bushings to be a direct fit. That means they are not universal and are designated to fit onto your vehicle’s shock absorbers the same way your originals did. While this is nice because it makes for a relatively easy installation, it is more important in function. Shock absorber bushings play a critical role in dampening sound, vibration, and keeping the vehicle steady over rough road surfaces. Your vehicle’s suspension system was configured a certain way to minimize turbulence on the components. KYB takes into account the OEM’s intent, which helps their shock absorber bushings deliver more of a benefit upon installation.
Another point of emphasis is the material. Each shock absorber bushing is made of specially-treated rubber. Unlike polyurethane, automotive rubber has a touch more give to it. The texture of rubber shock bushings is different; it is both hard and soft at the same time. It has to have certain amount of density to support the shocks. On the other hand, rubber shock bushings have just a little pliability that allows them to offer a cushion while maneuvering the vehicle’s weight. This pays off for models that take on a lot of miles over changing terrain. The wheels go from smooth to rough to inclines and so forth. Rubber shock bushings will last longer when faced with changes in topography.
Most experts will agree that the suspension dampers should last approximately 50,000 miles. Some cars will last longer than others. Factors such as age of vehicle, area where the car is driven, and tire wear can affect how long it is until you need replacement shocks.