Home › CDL Practice Tests › Air Brakes Questions › Question 89
What does the brake test at the start of a trip, rolling at about 5 mph, check that gauge tests cannot?
- A.That the brakes actually stop the vehicle evenly and the service and parking controls feel and work correctly in motion
- B.The top speed of the vehicle
- C.The accuracy of the odometer
- D.The temperature inside the trailer
Correct answer
A. That the brakes actually stop the vehicle evenly and the service and parking controls feel and work correctly in motion
Why
Gauges prove air is present, but only a low-speed stop proves the friction brakes convert it into stopping force without pulling. That rolling check is the final link in the inspection chain.
Manual topic: Air Brakes - Air Leakage and Brake Tests · From the Air Brakes practice bank (AB-089).