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A badly scored drum can sometimes be repaired by refinishing. Where disc brakes have a minimum allowable thickness, drum brakes have a maximum allowable diameter. Since the contact surface is the inside of the drum, as you remove material from the drum brake the diameter gets bigger.What is the difference between brake drums and brake shoes?
The brake drums and shoes are vital components of a vehicle’s braking system. Brake drums and shoes are more commonly found on older vehicles which don’t use a disc brake system to slow the car down. Basically, the brake drums serve as the brake disc and the brake shoes serve as the brake pads.How do you measure the diameter of a brake drum?
To check, use a drum gage as shown to measure the diameter of the drum at least 1" from the lip or outer edge of the braking surface. If the measurements exceed the allowable limitations (see note below), the brake drum can be machined to restore concentricity.What are the symptoms of bad brake drums and shoes?
Below are 4 symptoms of bad brake drums and shoes. 1) Weak Brakes – If you step on the brake pedal and it takes longer for the car to slow down or stop, then you may have a problem with your brake drums and shoes. Although it is possible that other problems in the braking system may exist, the cause usually revolves around these two components.