Drum Brake System: Testing and Inspection
A: INSPECTION1. REAR DRUM BRAKE
1. Remove brake drum, and check that there is no fluid leakage from wheel cylinder.
If there is fluid leakage from wheel cylinder, replace it.
2. Inspect brake shoes for damage or deformities and check brake linings for wear.
NOTE:
- Always replace both leading and trailing brake shoes for the left and right wheels at the same time.
- When either the left or the right brake assembly is replaced, always replace the leading shoe and trailing shoe of the other.
- The cotter pin, once removed, cannot be reused.
To replace trailing shoe, remove cotter pin. Clevis pin should also be replaced if worn.
3. Check brake drum for wear, dents or other damage.
If the inside surface of brake drum is streaked correct the surface with emery cloth (#200 or more). If it is unevenly worn, tapered, or the outside surface of brake drum is damaged, correct or replace it.
Brake drum inner diameter
Standard value: 228.6 mm (9.000 in)
Service limit: 230.6 mm (9.079 in)
If deformation or wear of back plate, shoe, etc. is noticeable, replace the affected parts.
2. PARKING BRAKE (REAR DISC BRAKE)
Inspect brake linings and drums of both sides of the rear brake at the same time by removing brake drums.
1. Inspect brake shoes for damage or deformation and check brake linings for wear.
NOTE: Always replace both primary and secondary brake shoes for the left and right wheels at the same time.
2. Check brake drum for wear, dents or other damage. If the inside surface of brake drum is streaked, correct the surface with emery cloth (#200 or more). If it is unevenly worn, tapered, or the outside surface of brake drum is damaged, correct or replace it.
3. If the deformation or wear of back plate, shoe, etc. is noticeable, replace them.
4. When the shoe return spring tension is excessively weakened, replace it, taking care to identify upper and lower springs.
B: ADJUSTMENT
1. REAR DRUM BRAKE
The main brake is adjusted automatically, and so there is no need to adjust it.
2. PARKING BRAKE (REAR DISC BRAKE)
For rear disc brake, adjust parking brake after bleeding the air.
1. Remove rear cover (rubber) installed at back plate.
2. Turn adjuster toward arrow mark (upward) until it is locked slightly, by using slot-type screwdriver as shown in illustration.
3. Turn back (downward) adjuster 3 to 4 notches.
4. Install cover (rubber) at original position correctly.