CDL Air Brakes TestInspecting Air Brake SystemsMedium
A driver is inspecting the brake pushrods and slack adjusters on a vehicle equipped with air brakes. They notice that a slack adjuster on a service brake chamber is bent. What is the primary concern with a bent slack adjuster?
- AIt will prevent proper brake adjustment and reduce braking force.
- BIt will cause the brake lining to wear unevenly.
- CIt will lead to a continuous air leak from the brake chamber.
- DIt indicates that the brake drum is out of round.
Show answer & explanationAnswer & explanation
Correct answer: A. It will prevent proper brake adjustment and reduce braking force.
A bent slack adjuster will not be able to pivot or move correctly, which will prevent it from properly adjusting the brake and maintaining the correct pushrod travel. This directly impacts the ability to achieve full braking force and can lead to uneven braking or reduced overall stopping power.
Why the other options are wrong
- B. While uneven wear might be a secondary effect, the primary issue is the inability to adjust the brake and apply force correctly.
- C. A bent slack adjuster itself does not typically cause an air leak from the brake chamber, though extreme damage could indirectly lead to other failures.
- D. A bent slack adjuster is usually a result of impact or excessive force, not an indicator of a warped brake drum.
Bent Slack Adjuster
A bent slack adjuster is a critical defect that prevents proper brake adjustment, leading to insufficient braking force and potential safety hazards.
- Prevents correct brake adjustment.
- Reduces effective braking force.
- Requires immediate repair/replacement.
Memory trick: Bent slack adjuster, brake's a goner, no adjustment, danger's on ya!