A brake shoe is not a part of
- a wedge brake.
- a drum brake.
- a disc brake. ✓
- any of the above.
Answer: C. a disc brake.
A brake shoe is not part of a disc brake.
Why this is the answer
The handbook separates foundation brakes into drum and disc designs. In a drum brake, shoes and linings sit inside the drum and press outward when you brake. A disc brake instead uses a rotor and a caliper with brake pads, which clamp the rotor. The component list for disc air brakes names rotors, calipers, brake pads, slack adjusters and brake chambers, not brake shoes. That is why the shoe does not belong to the disc brake choice.
Why the other answers are wrong
- A. a wedge brake. — Wedge brakes are listed with brake drums, brake shoes and linings among their components, so a brake shoe does belong to a wedge brake.
- B. a drum brake. — Drum brakes use brake shoes and linings inside the drum, so a shoe is part of a drum brake.
- D. any of the above. — A brake shoe does belong to both wedge and drum brakes, so saying it is not part of any of them is false.
Remember it
Picture drum and wedge brakes holding shoes inside; picture disc brakes squeezing pads instead.