Parking Brake Drum: Testing and Inspection

Parking Brake (Drum) Inspection





1. MEASURE BRAKE DISC INSIDE DIAMETER
Using a brake drum gauge or equivalent, measure the inside diameter of the disc.

Standard inside diameter: 190 mm (7.48 inch)
Maximum inside diameter: 191 mm (7.52 inch)

Replace the disc if the inside diameter is at the maximum value or more.
Replace the disc or grind it with a lathe if the disc is scored or worn unevenly.
2. INSPECT PARKING BRAKE SHOE LINING AND DISC FOR PROPER CONTACT
Apply chalk to the inside surface of the disc, then grind down the brake shoe lining to fit. If the contact between the disc and the brake shoe lining is improper, repair it using a brake shoe grinder or replace the brake shoe assembly.