Drum Brake System: Service and Repair

REAR DRUM BRAKE

Inspection and Adjustment


INSPECTION AFTER REMOVAL

Check the following items and replace if necessary.
- Check the brake lining for excessive wear, damage, and peeling.
- Check the brake shoe sliding surface for excessive wear and damage.
- Check each spring for settling, excessive wear, damage, and rust.
- Check the adjuster for smoothness, and check it for excessive wear, damage, and rust.
- Check the back plate for damage, cracks, and deformation.
- Check the wheel cylinder for cracks, damage, and leakage of brake fluid.
- Visually check the brake drum for excessive wear, cracks, and damage with a pair of vernier calipers.
- Check the drum brake component parts for excessive wear, damage, and rust.

INSPECTION AFTER DISASSEMBLY

Check the following items and replace if necessary.
- Check the wheel cylinder inner wall for excessive wear, cracks, and damage.
- Check the piston for excessive wear and damage.

INSPECTION AFTER ASSEMBLY

Check that the piston moves smoothly.

INSPECTION AFTER INSTALLATION

1.Check that the component parts of drum brake assembly are installed properly.
2.Rotate the brake drum and check that there is no drag. Perform the following procedure if necessary.
3.Remove the brake shoe. Removal And Installation.
4.Push the piston.

CAUTION:
Push both side of the piston simultaneously.
5.Install the brake shoe. Removal And Installation.
6.Adjust the brake shoe clearance (parking brake lever stroke). Service and Repair.
7.Check a drag of rear drum brake again. If any drag is found, disassemble the wheel cylinder and replace if necessary. Disassembly And Assembly.
8.Burnish contact surface between brake lining and brake drum after refinishing or replacing brake lining or brake drum, or if a soft pedal occurs at very low mileage. Service and Repair (brake lining), Inspection (brake drum).

ADJUSTMENT AFTER INSTALLATION

Adjust the brake shoe clearance (parking brake lever stroke). Service and Repair.