Brake Judder

Brake judder is the phenomenon where with medium to heavy braking from high speed, severe vibration is felt throughout the whole vehicle. It is often attributed to a mode of vibration in which the front suspension executes a predominantly fore and aft vibration with the two road wheels in-phase with each other. Excitation is often provided by the oscillatory forcing generated when applying the brakes to a brake disk that has disk thickness variation.

The driver will experience:

Disc thickness variation can be caused by:

See also: Brake Graunch, Brake Squeal, Brakes.

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Subjects: Automotive Mechanical Engineering Noise & Vibration