Drum Brake System: Testing and Inspection

BRAKE DRUM INSIDE DIAMETER CHECK





1. Remove the brake drum.
2. Measure the inside diameter of the brake drum at two or more locations.
Standard value: 228.6 mm (9.00 inches)
Limit: 230.6 mm (9.08 inches)
3. Replace the brake drums, shoe and lining assembly when wear exceeds the limit value or is badly imbalanced.

BRAKE LINING AND BRAKE DRUM CONTACT CHECK





1. Remove the brake drum.
2. Remove the shoe and lining assembly.
3. Chalk the inner surface of the brake drum and rub with the shoe and lining assembly.
4. Replace the shoe and lining assembly or brake drums if there are any irregular contact areas.

NOTE: Clean off chalk after check.

BRAKE DRUM INSIDE DIAMETER CHECK





1. Remove the rear brake assembly, raise the rear brake assembly and secure it with a wire, etc.
2. Remove the brake disc.
3. Measure the inside diameter of the hub and disc at two or more locations.
Standard value: 168.0 mm (6.61 inches)
Limit: 169.0 mm (6.65 inches)
4. Replace the brake discs and shoe and lining assembly when the wear exceeds the limit value or if the measured areas are not equal to each other. (concentric).