Home › CDL Practice Tests › Air Brakes Questions › Question 161
With the service brakes fully applied, what angle relationship should the pushrod and slack adjuster arm show?
- A.The pushrod should be parallel to the adjuster arm
- B.The pushrod and the adjuster arm should form an angle of about 90 degrees or slightly greater
- C.The arm should point straight back toward the chamber
- D.The angle should be as small as possible
Correct answer
B. The pushrod and the adjuster arm should form an angle of about 90 degrees or slightly greater
Why
Near a right angle, chamber force is transferred into cam rotation most effectively through the stroke. Angles far from that range signal excessive travel or geometry problems and reduce the force that reaches the shoes.
Manual topic: Air Brakes - Slack Adjusters · From the Air Brakes practice bank (AB-161).