Parking Brake System: Testing and Inspection

INSPECTION

1. Inspect disassembled parts for wear, rust or damage.

Measure Brake Shoe Lining Thickness:

2. Measure parking brake shoe lining thickness.
Using a ruler, measure the thickness of the shoe lining.
Standard thickness: 2.0 mm (0.079 inch)
Minimum thickness: 1.0 mm (0.039 inch)

Measure Disc Inside Diameter:

3. Measure Disc inside diameter.
Using a vernier calipers, measure the inside diameter of the Disc.

Standard inside diameter: 170 mm (6.69 inch)
Maximum inside diameter: 171 mm (6.73 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 is worn unevenly.

Brake Lining And Disc Proper Contact:

4. Inspect Parking Brake 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.

Clearance Between Parking Brake Shoe And Lever:

5. Measure clearance between Parking Brake Shoe and lever.
Using a feeler gauge, measure the clearance.

Standard clearance: Less than 0.35 mm (0.0138 inch)

If the clearance is not within the specification, replace the shim with one of the correct size.

Shim Thickness Chart:

6. If necessary, replace shim.

Shim Replacement:

(a) Using a screwdriver, remove the C-washer.

Installing New C-Washer:

(b) Remove the Parking Brake Lever, and install the correct size shim.
(c) Install the Parking Brake Lever with a new C-washer.
(d) Remeasure the clearance.