Component Tests and General Diagnostics

PARKING BRAKE: PARKING BRAKE ASSEMBLY: INSPECTION

1. CHECK BRAKE DISC INSIDE DIAMETER

(a) Using a drum gauge or equivalent, measure the inside diameter of the disc.





Standard inside diameter:

172 mm (6.77 in.)

Maximum inside diameter:

173 mm (6.81 in.)

(b) If the inside diameter is more than the maximum, replace the disc.

2. CHECK PARKING BRAKE SHOE LINING THICKNESS

(a) Using a ruler, measure the shoe lining thickness.





Standard thickness:

3.5 mm (0.138 in.)

Minimum thickness:

1.0 mm (0.0394 in.)

(b) If the shoe lining thickness is less than the minimum, replace the brake shoe assembly.

3. CHECK BRAKE DISC AND PARKING BRAKE SHOE LINING FOR PROPER CONTACT





(a) Apply white 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 assembly.