Brake shudder, judder, pulse hot

Faulty disk rotors

 

Hot juddering

"Thermal juddering" can be described as follows:

A droning noise in the frequency range between 100 and 250 Hz - in the course of braking the droning can change intensity; the brake effect is not impaired by this. Fluctuations in the brake torque and/or vibrations in the steering wheel as well as a pulsating brake pedal and vibrating chassis parts. During the braking process the intensity of brake juddering depends on the currently effective brake force (pedal force). As a rule, the effects of hot juddering are recognized in the form of circular arranged marks on the friction surfaces of the brake discs. As a result of local temperature peaks during the brake process there is a material transfer from the disc brake pad to the brake disc and/or a permanent structural change in the cast structure of the brake disc. As a rule, a material transfer can be removed again by braking in the normal load range; the punctually occuring structural change, which is called a martensite formation, is harder than the original structure and can only be removed mechanical processing. In this case, you must make sure that the hardened structure is completely removed. Make sure that you do not reach or fall short of the minimum measurement! However, to exclude any risks, we recommend to change the brake disc. 

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