Component Tests and General Diagnostics

PARKING BRAKE: PARKING BRAKE ASSEMBLY: INSPECTION

1. INSPECT BRAKE DISC INSIDE DIAMETER

(a) Using a brake drum gauge or an equivalent tool, 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 more than the maximum, replace the disc.

2. INSPECT PARKING BRAKE SHOE LINING THICKNESS

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





Standard thickness:

2.45 mm (0.0965 in.)

Minimum thickness:

1.0 mm (0.0394 in.)

If the lining thickness is less than the minimum, or if there is severe or uneven wear, replace the brake shoe.

NOTICE:
Always replace both No. 1 parking brake shoe assembly and No. 2 parking brake shoe assembly together.

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

(a) Apply chalk to the inside surface of the disc, then grind down the brake shoe lining to fit the disc.

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.