Component Tests and General Diagnostics
PARKING BRAKE ASSEMBLYINSPECTION
1. CHECK BRAKE DISC INSIDE DIAMETER
(a) Using a drum gauge or equivalent, measure the inside diameter of the disc.
Standard inside diameter: 190 mm (7.48 in.)
Maximum inside diameter: 191 mm (7.52 in.)
If the inside diameter is greater than the maximum, replace the disc.
2. CHECK PARKING BRAKE SHOE LINING THICKNESS
(a) Using a ruler, measure the shoe lining thickness.
Standard thickness: 2.5 mm (0.098 in.)
Minimum thickness: 1.0 mm (0.039 in.)
If the shoe lining thickness is equal to or less than the minimum, replace the brake shoe.
3. CHECK BRAKE DISC AND PARKING BRAKE SHOE LINING FOR PROPER CONTACT
(a) Apply chalk to the inside surface of the disc. Touch the brake shoe to the disc and check that there is full contact between the brake shoe and disc (white chalk is transferred to the entire brake shoe).
If the contact is not as specified, use a shoe grinder to repair the brake shoe, or replace the brake shoe.
4. CHECK CLEARANCE BETWEEN PARKING BRAKE SHOE AND LEVER
(a) Using a feeler gauge, measure the clearance.
Maximum clearance: 0.35 mm (0.0138 in.)
If the clearance is greater than the maximum, replace the shim with one of the correct size.
