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Rubber Bushing

Rubber bushing is used for vehicle suspension system, engine chassis. With the best cushioning and noise reduction, it can effectively eliminate damaging wear and tensile stress, which improve vehicle driving flexibility and safety.
Rubber bushings are used as common joints in the vehicle suspension system for automotive,industrial trucks, trains, construction machinery, etc.bushings are used if the joint only needs to move in one direction,such as up and down or side to side.

Bushings are the most common joints in your suspension system and also the most likely to cause a squeaky suspension.

Bushings are basically rubber sleeves that go between the frame of your vehicle and thesuspension component which allows the suspension component to rotate.

Bushings can squeak if the rubber becomes torn or even dried out or if the suspension component starts to rotate inside the metal sleeve inside the bushing due to incorrect torque or a broken bushing.

Worn out bushings cause more movement which in return causes those squeaking noises as well as incorrect suspension geometry. 

If you suspect a squeaking bushing try spraying a small amount of lubricant on the bushings to see if the noise goes away temporarily. If it does,consider replacing the bushing.For an even quieter ride,consider using polyurethane bushings.