3.3 Brake Noise

Occasional groaning or squealing sounds coming from the brakes, especially disc brakes, are usually caused by vibrations transmitted through the brake pads. The problem is not unique to Volkswagens. New brake friction materials, using little or no asbestos for health reasons, may contribute to an increase in brake noise problems in all makes. These noises, though discomforting, are normal and rarely indicate a problem in brake system function or effectiveness.

Although there is no permanent solution, proper maintenance and repair may help minimize brake noise. Disc brake caliper assemblies include anti-rattle springs, designed to minimize vibration and noise. As much as possible, brake pads and calipers should be kept free of foreign matter and corrosion which may inhibit smooth operation. Always resurface or replace brake rotors when changing brake pads.

A reduction in brake noise may be possible by installing a shim kit with the pads. The kit, Volkswagen Part No. 171 698 993, contains self-adhesive shims which attach to the backs of the brake pads to damp vibration. The backs of the pads must be cleaned down to the bare metal for good adhesion, and the shims can only be installed on thinner, partially worn pads. The combined thickness of the pad and shim must not exceed the thickness of a new pad. See LUBRICATION AND MAINTENANCE for specifications.

Rear drum brake squeak may be more easily corrected. A lubricant is available to coat the points on the backing plate where the brake shoes make contact with the plate (raised or embossed points). The lubricant is Wolfracote grease, part number G 000 650, and is available from authorized Volkswagen dealers.