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Disc Brake System: Testing and Inspection

Vibrations during braking





Fault symptoms
The front assembly may vibrate during braking.

Conditions
Car driven forward and brake pedal depressed.

Diagnostic help
Vibration can be due to the following causes
^ Excessive wheel hub runout
^ Excessive variation in brake disc thickness.

Check as described in Checking for lateral runout and variation in thickness, front wheels.