Contents: Checking the thickness of the drum…⤓ Checking the inner diameter of the…⤓ Checking the fit of the brake shoes…⤓
Checking the thickness of the drum brake shoe linings
1. Remove the brake drum.
2. Measure the thickness of the parking brake shoe lining at the point of greatest wear.
Nominal value - 4.3 mm
The maximum permissible value is 1 mm
3. If the lining thickness is less than the maximum permissible value or uneven wear is observed, the brake pads must be replaced as a set.
Attention:
- If it is necessary to replace the brake shoe and lining assembly, replace the entire set of brake shoes on the left and right sides of the vehicle to avoid uneven braking force on the right or left wheels and the vehicle skidding when braking.
- If there is a significant difference in the degree of wear (thickness) of the brake linings on the left and right wheels, then it is necessary to check the operation of the working brake cylinders.
Checking the inner diameter of the brake drum
1. Remove the brake drum.
2. Measure the inside diameter of the brake drum at two or more points.
Nominal value - 203 mm
The maximum permissible value is 205 mm
3. If the wear of the brake drum exceeds the maximum permissible value, or the brake drum has a significant imbalance, then it is necessary to replace the brake drum and brake shoes as an assembly.
Checking the fit of the brake shoes to the surface of the brake drum
1. Remove the brake shoes and brake drum assembly.
2. Apply chalk to the inside surface of the brake drum and run the brake shoe over it.
3. If the contact patch is uneven, replace the brake drum or brake shoes as a set. Note: After checking, remove the chalk from the inner surface of the brake drum and from the lining surfaces of the brake shoes.
