Measure the thickness with a micrometer (A) overlays.
- Nominal lining thickness: 3.2 mm.
- The maximum allowable thickness of the overlays: 1.5 mm.
Visually inspect the inside of the brake drum for uneven wear, streaks and cracks. By caliper timeittn inner diameter of the brake drum in two directions.
- Nominal inner diameter of the brake drum: 172 mm.
- Maximum permissible inner diameter of the brake drum: 173 mm.
If necessary, remove the parking brake pads and check the following:
- Check brake pad surfaces for uneven wear and damage.
- Check anchor pins for minor wear and corrosion.
- Check return springs for looseness.
- Check the operation of the clearance adjustment mechanism.