Parking Brake System: Testing and Inspection

PARKING BRAKE ASSEMBLY

COMPONENTS:

INSPECTION
1. INSPECT DISASSEMBLED PARTS
a. Check the disassembled parts for wear, rust or damaged.





2. INSPECT BRAKE SHOE LINING THICKNESS
a. Using a ruler, measure the thickness of the shoe lining.
Standard thickness: 4.0 mm (0.157 inch)
Minimum thickness: 1.0 mm (0.039 inch)
If the lining thickness is equal to or less than the minimum, or if severe or uneven wear is present, replace the shoe.





3. INSPECT BRAKE DRUM INSIDE DIAMETER
a. Using a drum gauge or equivalent, measure the inside diameter of the drum.
Standard inside diameter: 230 mm (9.06 inch)
Maximum inside diameter: 231 mm (9.09 inch)
If the inside diameter of the drum is greater than the maximum, replace the drum.





4. INSPECT BRAKE DRUM AND BRAKE SHOE LINING FOR PROPER CONTACT
a. Apply chalk to the inside surface of the drum. Then grind the brake shoe lining on the drum until full contact is achieved.

HINT: If the drum and brake shoe lining do not have full contact, use a brake shoe grinder or replace the brake shoe.

b. After the inspection, wipe off chalk of the inside surface of the drum and lining surface.
5. INSPECT PARKING BRAKE SHOE AND PARKING BRAKE SHOE LEVER CLEARANCE





a. Using a feeler gauge, measure the clearance between the shoe and lever.
Standard clearance: Less than 0.25 mm (0.0098 inch)
If the clearance is not within the specification, replace the shim with one of the correct size.

Standard Shim Thickness:

b. If necessary, replace the shim.
1 Using a screwdriver, remove the C-washer.
2 Remove the parking brake shoe lever and shim.
3 Install the correct size shim.





4 Install the parking brake shoe lever and a new C-washer.
5 Remeasure the clearance.