Brake Noise - Corrective Action
Group: 46Number: 92-02
Date: 10/15/92
Subject:
Brake Noise
Model(s):
90/100 All Models
m.y. 1992-1993
Check/inspect for condition(s) described in this Bulletin when performing the initial Delivery Inspection. When necessary perform corrective action(s) as outlined to delivering to the customer.
Note:
For new vehicles in VWoA port inventory over 180 days follow brake cleaning procedure as outlined in Technical Bulletin Group 00, Number 92-03 instead of this procedure.
Brake noise is mainly the result of vibrations between components of the brake caliper assembly.
The following procedure has proven effective in reducing brake noise and eliminating customer complaints arising from noisy brakes.
Caution:
Brake noise will be effectively reduced only if ALL steps of this procedure are followed.
Use only Plastilube Moly 3 (R) high temperature grease, P/N ZVP 264 103. Similar products may not have the lubricating qualities necessary to achieve successful results for this repair.
Caution:
Part numbers are for reference only. Always check with the Parts Department for the latest information.
See Brake discs, front and rear - before assembling brake components.
Front brake caliper
inspect pads, deglaze and clean face of pad with sandpaper, if necessary
slightly chamfer (bevel) edges of brake pad material with file, if not like that already
clean brake pad carrier contact points (arrows) and apply Plastilube Moly 3 (R) high temperature grease, P/N ZVP 264 103
clean and lubricate caliper piston with high temperature grease
apply small amount of high temperature grease to all spring contact points when reassembling
Rear brake caliper
inspect pads, deglaze and clean face of pad with sandpaper, if necessary
slightly chamfer (bevel) edges of brake pad material with file, if not like that already
clean brake pad carrier contact points (arrows) and apply Plastilube Moly 3 (R) high temperature grease, P/N ZVP 264 103
clean and lubricate caliper piston with high temperature grease
apply small amount of high temperature grease to spring contact points when reassembling
Brake discs, front and rear
Glazed discs must be cleaned using a power disc-type sander and 80 grit sandpaper. Sand brake discs to achieve a "cross-hatch" pattern:
lightly sand in clockwise direction using leading edge of sanding disc
continue to sand in clockwise direction using trailing edge of sanding disc
Labor operation