Which component is not a part of the air brake chamber?
- Diaphragm
- Camshaft ✓
- Pushrod
- Return spring
Answer: B. Camshaft
The camshaft is not a part of the air brake chamber.
Why this is the answer
The handbook diagram shows the air brake chamber's pushrod connected to a slack adjuster, and the slack adjuster attached to a camshaft with an s-shaped head. That places the camshaft in the mechanical linkage outside the chamber, not as one of the chamber's parts. The basic-components list also treats brake chambers and slack adjusters as foundation-brake parts. So when asked which listed item is not part of the chamber, the camshaft is the one the passage shows beyond the chamber.
Why the other answers are wrong
- A. Diaphragm — The passage does not place the diaphragm beyond the slack adjuster; the component it shows there is the camshaft.
- C. Pushrod — The passage names the pushrod as the chamber part connected to the slack adjuster, so it is not the outside component asked for.
- D. Return spring — The passage does not name a return spring as the shaft turned by the slack adjuster; it names the camshaft in that position.
Remember it
Follow the force: pushrod, slack adjuster, camshaft. The camshaft lives past the chamber, not inside it.