Home › CDL Practice Tests › Air Brakes Questions › Question 171
A brake is manually brought back into adjustment but is out of adjustment again a few days later. What does that pattern most likely mean?
- A.The air tanks need draining more often
- B.There is an underlying problem such as worn foundation parts, a faulty adjuster, or excessive lining or drum wear that needs repair
- C.The brake is breaking in normally and should be ignored
- D.The driver is pressing the pedal too firmly
Correct answer
B. There is an underlying problem such as worn foundation parts, a faulty adjuster, or excessive lining or drum wear that needs repair
Why
Adjustment that will not hold is a symptom, not a complete repair. Worn cams, bushings, rollers, drums, or a defective automatic adjuster will keep recreating the excess stroke until the cause is fixed.
Manual topic: Air Brakes - Slack Adjusters · From the Air Brakes practice bank (AB-171).