Home › CDL Practice Tests › General Knowledge Questions › Question 111
During a brake check, you pull the slack adjuster and the pushrod moves more than about an inch where the adjuster meets it. What does that tell you on a manual adjuster?
- A.The brakes are adjusted perfectly
- B.The brakes are out of adjustment and need attention before the stroke runs too long
- C.The air pressure is too high
- D.The brake drum is brand new
Correct answer
B. The brakes are out of adjustment and need attention before the stroke runs too long
Why
Excess pushrod movement means the chamber is using its travel just to take up slack instead of applying force. Automatic adjusters should keep stroke in range by themselves, and a stroke that stays long signals a defect to repair, not something to ignore.
Manual topic: Air Brakes - Slack Adjusters · From the General Knowledge practice bank (GK-111).