Home › CDL Practice Tests › Air Brakes Questions › Question 109
What must a driver do before releasing the spring brakes after a cold start?
- A.Release them at 30 psi to save time
- B.Release them before starting the engine
- C.Build air pressure to the normal operating range so there is enough air to hold the springs off and to make a service stop if needed
- D.Release them and rely on rolling slowly
Correct answer
C. Build air pressure to the normal operating range so there is enough air to hold the springs off and to make a service stop if needed
Why
Releasing the springs consumes the very reserve needed for the first service application. Waiting for full pressure guarantees both a clean release and brakes ready for the first stop sign.
Manual topic: Air Brakes - Spring Brakes and Parking Brakes · From the Air Brakes practice bank (AB-109).