Drum Brake System: Testing and Inspection

INSPECTION





1. Measure the inside diameter of the brake drum. Check the runout of the brake drum by using a dial indicator.
Inside diameter mm (inch)
Standard value: 180 (7.09)
Service limit: 182 (7.17)
Out-of-round (brake drum) mm (inch)
Service limit: 0.05 (0.002)





2. Measure the brake shoe lining thickness.
Lining thickness mm (inch)
Standard value: 4.8 (0.19)
Service limit: 1 (0.04)





3. Inspect the brake lining and drum for proper contact.
4. Inspect the wheel cylinder outside for excessive wear and damage.
5. Inspect the backing plate for wear or damage.