Home › CDL Practice Tests › Air Brakes Questions › Question 170
If a brake is adjusted too tightly, what problem can result?
- A.The brake will never apply at all
- B.The chamber will build air pressure faster
- C.Tight adjustment always improves fuel economy
- D.The shoes can drag against the drum, building heat and causing rapid wear and possible fade
Correct answer
D. The shoes can drag against the drum, building heat and causing rapid wear and possible fade
Why
A brake with too little clearance may stay in light contact even when released. That constant rubbing overheats the drum and linings, wastes fuel, and can leave the brake faded when a real stop is needed.
Manual topic: Air Brakes - Slack Adjusters · From the Air Brakes practice bank (AB-170).