Home › CDL Practice Tests › Air Brakes Questions › Question 64
Which condition would cause BOTH the low-pressure warning to activate and, if ignored, the spring brakes to eventually apply?
- A.A burned-out marker lamp
- B.A major air leak or compressor failure that steadily drains the reservoirs
- C.Low engine oil pressure alone
- D.A loose cargo strap
Correct answer
B. A major air leak or compressor failure that steadily drains the reservoirs
Why
Warning and spring application are two stages of the same pressure loss: warning first near 60 psi, springs later in the 20 to 45 psi range. Recognizing the sequence gives the driver one clear chance to stop under control.
Manual topic: Air Brakes - Safety Valve and Low Pressure Warning · From the Air Brakes practice bank (AB-064).