Why are automatic slack adjusters utilized?
- To prevent disconnection from pushrods
- To increase brake longevity
- To avoid regularly performing manual brake re-adjustments ✓
- To ensure the vehicle can handle heavy loads
Answer: C. To avoid regularly performing manual brake re-adjustments
Automatic slack adjusters are used to avoid regularly performing manual brake re-adjustments.
Why this is the answer
The handbook says automatic slack or brake adjusters are fitted so you do not have to keep doing manual brake re-adjustments. It adds that properly working automatic adjusters do not need regular re-adjustment, and if they do need periodic re-adjustment, that points to a defect. Inspection of brake adjustment is still required with either automatic or manual adjusters. So the purpose is to remove the routine manual re-adjustment job, while keeping the need to inspect adjustment.
Why the other answers are wrong
- A. To prevent disconnection from pushrods — The passages describe the pushrod, yoke, clevis pin and slack adjuster as connected parts, but they do not say automatic adjusters are used to stop the pushrod from disconnecting.
- B. To increase brake longevity — No passage says automatic slack adjusters are used to increase brake longevity; they are described as a way to avoid regular manual re-adjustment.
- D. To ensure the vehicle can handle heavy loads — The passages do not link automatic slack adjusters to load capacity; they discuss keeping brake adjustment within limits, not making the vehicle suitable for heavy loads.
Remember it
Automatic still needs checking: inspect the adjustment, and leave repairs to certified technicians.