Brake Drum: Service and Repair

REAR DRUM BRAKE


Removal and Installation of Drum Brake Assembly


WARNING:
Clean dust with a vacuum dust collector to minimize the hazard of air borne particles or other materials.

CAUTION:
- While removing brake shoes, do not depress brake pedal because wheel cylinder pistons will pop out.
- It is not necessary to disconnect brake tube except for disassembly or replacement of wheel cylinder assembly.
- Keep drum free from brake fluid.

REMOVAL
1. Remove rear wheels and tires using power tools.
2. With the parking brake lever released, remove the brake drum. If it is difficult to remove the brake drum, use the following procedure.
a. Remove the plug from the back plate.





b. Press up adjuster lever with a suitable tool from the plug hole (at the side of wheel cylinder) on the back plate as shown. Turn the frame of the adjuster assembly using a suitable tool in the direction that narrows the expanded brake shoes.
3. While pushing and rotating the retainer, pull out the shoe hold pin, and remove the brake shoe assembly.

CAUTION:
Do not damage the wheel cylinder boot.
4. Disconnect the parking brake rear cable from the operating lever.

CAUTION:
Do not bend the parking brake cable.
5. Disassemble the brake shoe assembly (brake shoes, springs, adjuster and adjuster lever).





6. Remove the retainer ring (A) with a suitable tool to separate the operating lever (C) from brake shoe.
- Contact point (B)
- Pin (D)

INSPECTION AFTER REMOVAL

Lining Thickness Inspection
Check lining thickness.











Drum Inner Diameter Inspection
Check inner diameter of brake drum.





Measurement area: lining contact surface (center)






Wheel Cylinder Leakage Inspection
- Check wheel cylinder for brake fluid leakage.





- Check for wear, damage, and looseness. If any non-standard 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. Install the operating lever (C) using the following procedure.





a. Position operating lever (C) on brake shoe.
b. Install retainer ring (A) on operating lever (C), and crimp them until their contact points (B) are met.
- Pin (D)





2. Apply NISSAN brake grease (KRF00 00005) 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.










4. Assemble the shoe, adjuster, adjuster lever and springs on the shoe assembly.
5. Connect the parking brake rear cable to the operating lever.
6. Install the shoe assembly. After installation 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 approximately 2 to 3 times.
9. Adjust the clearance of brake shoe.
10. Install rear wheels and tires. Refer to Rotation.