Brake Drum: Service and Repair
REAR DRUM BRAKEBR-34 Component:
CAUTION:
- Clean dust on drum and back plate with a vacuum dust collector. Do not blow with compressed air.
- Make sure parking brake lever is released completely.
Removal and Installation of Drum Brake Assembly
REMOVAL
1. Remove tire from the vehicle.
2. With the parking brake lever released, remove the brake drum. If it is difficult to remove brake drum, remove as follows:
a. Press up adjuster lever with a wire or equivalent from plug hole (plug hole at the side of wheel cylinder) on the back plate as shown. Turn frame of adjuster assembly using a suitable tool in the direction that narrows frame to narrow enlarged brake shoe.
3. While pushing and rotating the retainer, pull out shoe hold pin, and remove shoe assembly.
CAUTION:
Do not damage the wheel cylinder boot.
4. Remove the parking brake rear cable from the operating lever.
CAUTION:
Do not bend the parking brake cable.
5. Disassemble the shoe assembly (shoe, springs, adjuster, adjuster lever).
6. Remove retainer ring (A) with a tool to separate operating lever (C) from brake shoe.
- Retainer ring (A)
- Contact point (B)
- Operating lever (C)
- Pin (D)
INSPECTION AFTER REMOVAL
Lining Thickness Inspection
Check lining thickness.
Standard thickness (A): 4.0 mm (0.157 in)
Repair limit thickness (A): 1.5 mm (0.059 in)
Drum Inner Diameter Inspection
Check inner diameter of brake drum.
Measurement area: lining contact surface (center)
Standard inner diameter 228.6 mm (9.000 in) dia.
Repair limit inner diameter 230.0 mm (9.055 in) dia.
Wheel Cylinder Leakage Inspection
- Check wheel cylinder for brake fluid leakage.
- Check for wear, damage, and looseness. If any nonstandard condition is found, replace it.
Other Inspections
Check the following:
- Inside of the drum for excessive wear, damage, and cracks.
- Lining for excessive wear, damage, and peeling.
- Shoe sliding surface for excessive wear and damage.
- Return spring for sagging.
- Check back plate for damage, cracks, and deformation. Replace back plate as necessary.
Replace applicable part as necessary.
INSTALLATION
1. If operating lever (C) if removed.
a. Install operating lever (C) to brake shoe.
b. Install retainer ring (A) to operating lever (C), and crimp them until their contact points (B) are met.
- Retainer ring (A)
- Contact point (B)
- Operating lever (C)
- Pin (D)
2. Apply NISSAN brake grease (KRF0000005) to brake shoes sliding surfaces (the shaded areas) and other parts on the back plate as indicated by arrows.
3. Apply NISSAN brake grease KRF00 00005) to screw and confirm the difference between right and left wheel for assembling when disassembled.
Right rear wheel Thread cutting direction: Right-hand screw
Left rear wheel Thread cutting direction: Left-hand screw
4. Assemble the shoe, adjuster, adjuster lever and springs to the shoe assembly.
5. Connect the parking brake rear cable to the operating lever.
6. Install the shoe assembly. After assembly, be sure that each part is installed properly.
CAUTION:
Do not damage the wheel cylinder piston boot.
7. Install the brake drum.
8. Depress brake pedal for several times (approximately 2, 3 times).
9. Adjust clearance of brake shoe. Refer to PB-4, "On-Vehicle Service". Adjustments
10. Install tires to the vehicle.