GM Service Manual Online
For 1990-2009 cars only

Causes

Correction

Glazed brake linings

Replace the glazed brake linings.

Low engine vacuum

Diagnose the low engine vacuum condition.

Leaking vacuum booster

Replace the vacuum booster.

Restricted passage in vacuum booster

Locate and fix the source of the vacuum restriction in the vacuum booster.

Worn out brake linings

Replace the brake linings.

Incorrect lining material

Replace the brake linings.

Contaminated brake linings

Replace the brake linings.

Linings damaged by abusive use

Replace the brake linings.

Restricted brake fluid passage

Locate and fix the source of the brake fluid restriction.

Brake pedal linkage interference/binding

Repair/replace the brake pedal linkage.

Operator riding brake pedal

Advise the operator of proper brake usage.

Excessive vehicle loading

See the tire placard for vehicle capacity specification.

Leaking O-ring between the master cylinder and the vacuum booster

Overhaul the master cylinder in order to replace the O-ring.