Parking Brake Shoe

INSPECTION - REAR DRUM IN HAT BRAKE As a general rule, riveted brake shoes (1) should be replaced when worn to within 0.78 mm (1/32 in.) of the rivet heads. Bonded lining should be replaced when worn to a thickness of 1.6 mm (1/16 in.). Examine the lining contact pattern to determine if the shoes are bent or the drum is tapered. The lining should exhibit contact across its entire width. Shoes exhibiting contact only on one side should be replaced and the drum checked for runout or taper. Inspect the adjuster screw assembly. Replace the assembly if the star wheel or threads are damaged, or the components are severely rusted or corroded. Discard the brake springs and retainer components if worn, distorted or collapsed. Also replace the springs if a brake drag condition had occurred. Overheating will distort and weaken the springs. Inspect the brake shoe contact pads on the support plate, replace the support plate if any of the pads are worn or rusted through. Also replace the plate if it is bent or distorted.

DESCRIPTION Drum in hat park brakes are dual shoe, internal expanding units with an automatic self adjusting mechanism.

Drum in hat park brakes are dual shoe, internal expanding units with an automatic self adjusting mechanism.

When the parking brake lever is pulled the brake cable pulls the brake shoes outward against the brake drum. When the brake lever is released the return springs attached to the brake shoes pull the shoes back to their original position.

1.   Raise and support the vehicle.
  2.   Remove the tire and wheel assembly.
  3.   Remove the disc brake caliper. See REMOVAL.
  4.   Remove the disc brake rotor. See REMOVAL.
  5.   Remove the axle shaft (2). Refer to REMOVAL .

6. Disassemble the rear park brake shoes (1).

Clean the individual brake components, including the support plate exterior, with a water dampened cloth or with brake cleaner. Do not use any other cleaning agents. Remove light rust and scale from the brake shoe contact pads on the support plate with fine sandpaper.

As a general rule, riveted brake shoes (1) should be replaced when worn to within 0.78 mm (1/32 in.) of the rivet heads. Bonded lining should be replaced when worn to a thickness of 1.6 mm (1/16 in.).

Examine the lining contact pattern to determine if the shoes are bent or the drum is tapered. The lining should exhibit contact across its entire width. Shoes exhibiting contact only on one side should be replaced and the drum checked for runout or taper.

Inspect the adjuster screw assembly. Replace the assembly if the star wheel or threads are damaged, or the components are severely rusted or corroded.

Discard the brake springs and retainer components if worn, distorted or collapsed. Also replace the springs if a brake drag condition had occurred. Overheating will distort and weaken the springs.

Inspect the brake shoe contact pads on the support plate, replace the support plate if any of the pads are worn or rusted through. Also replace the plate if it is bent or distorted.

NOTE: On a new vehicle or after parking brake lining replacement, it is recommended that the parking brake system be conditioned prior to use. This is done by making one stop from 25 mph on dry pavement or concrete using light to moderate force on the parking brake lever.

1. Reassemble the rear park brake shoes (1). 2. Adjust the rear brake shoes (5). See ADJUSTMENTS.

3. Install the axle shaft (2). Refer to INSTALLATION . 4. Install the disc brake rotor. See INSTALLATION. 5. Install the disc brake caliper. See INSTALLATION.

6. Install the tire and wheel assembly. Refer to STANDARD PROCEDURE . 7. Lower the vehicle.