How To Measure Drum Brakes

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How do you measure drum brakes on a truck? (video)

How do you measure brake shoes?

Measure each by placing the flat base of the tire tread depth gauge onto the brake lining and then pushing down on the sliding ruler. Compare the measurements of each rivet in 1/32 inches to determine even or uneven brake shoe wear. For bonded shoe measurements, use a brake lining gauge. via

What is the maximum brake drum diameter?

Brake drums have a wear limit which is the maximum inside diameter the brake drum is allowed to be. This number is often cast on the outside of the drum it's allowed to be 422.1 millimeters or sixteen point six two inches. This is for your standard American trailer brake drum or drive axle drum. via

What is the minimum allowable brake drum diameter?

SCORED DRUMS

NOTE: WHEN CHECKING BRAKE DRUM DIAMETER FOR WEAR, THE DIAMETER SHOULD NOT EXCEED . 120" OVER THE ORIGINAL DIAMETER. WHEN REBORING BRAKE DRUMS, THE FINISHED DIAMETER SHOULD NOT EXCEED . 080" OVER THE ORIGINAL DIAMETER. via

How do you measure brake drum height? (video)

How thick should brake shoes be?

Therefore, anywhere from 3mm to 4mm is the recommended thickness to replace brake pads in most cases. You may be able to get away with slightly less thickness, but certainly nothing less than 2mm. At that point, braking performance can suffer and damage to your brake rotors is more likely. via

What size are drum brake shoes?

Expert Reply: To determine whether you need a 10 or a 12 inch brake shoe, you would measure the inside diameter of your brake drum. Depending on the brake assembly, in many instances the cost of a new assembly is the same or just a few dollars more than the replacement brake shoes. via

What is brake drum diameter?

Drum outer diameter: 260 mm. Inner Brake Drum Height: 51 mm. via

How can you tell if a brake drum is out of round?

Martensite spotted drums have extremely hard, slightly raised, dark colored spots on the braking surface, shown uneven wear and the surface is out-of-round. This condition may cause excessive noise or shudder during brake applications. Unless this is detected very early, the brake drum should be scrapped. via

How do I know if my brake drums are bad?

One of the first symptoms of bad or failing drum brakes is unusual brake pedal feel. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. via

How much can you turn a brake drum?

The following should be noted when turning: A. When resurfacing a drum, allow at least 0.040 under the maximum diameter and on a rotor 0.040 over the minimum thickness for additional wear. For example, this usually means the drum may be turned a total of 0.080 over the brake surface diameter of a new brake drum. via

Can brake Drums be resurfaced?

To resurface a brake rotor or drum, a mechanic will remove a thin layer of metal from the damaged surface of your brake rotors or drums. Resurfacing is usually considerably cheaper than brake rotor or drum replacement and can be completed much faster by brake service specialists. via

How do you break a brake drum?

  • Drive your car to an open highway and accelerate to about 60 miles per hour.
  • Apply your brakes firmly but not hard enough the trigger the antilock braking system, or ABS.
  • Repeat Steps 1 and 2 about 10 times to break in your new drum brakes.
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