Home › CDL Practice Tests › Air Brakes Questions › Question 160
When checking slack by hand, how much free movement at the slack adjuster suggests the brake needs adjustment attention?
- A.About 4 inches of hand movement is normal
- B.Any movement at all means the chamber is ruptured
- C.Hand checking cannot reveal anything about slack
- D.Movement of more than about 1 inch when the adjuster is pulled hard by hand where the pushrod attaches
Correct answer
D. Movement of more than about 1 inch when the adjuster is pulled hard by hand where the pushrod attaches
Why
Pulling on the adjuster with the brakes released shows the free play built up from wear and adjustment. Movement beyond about an inch at the pushrod connection is the manual's practical warning that adjustment should be checked by stroke measurement.
Manual topic: Air Brakes - Slack Adjusters · From the Air Brakes practice bank (AB-160).