Home › CDL Practice Tests › Air Brakes Questions › Question 87
What should a driver do before timing a leakage test to get an honest result?
- A.Remove the wheel chocks on a grade
- B.Have a helper hold the truck by hand
- C.Test only on a steep hill
- D.Ensure the parking brakes are set appropriately for the test, wheels are chocked as needed, and the vehicle cannot roll when service brakes are released
Correct answer
D. Ensure the parking brakes are set appropriately for the test, wheels are chocked as needed, and the vehicle cannot roll when service brakes are released
Why
Releasing brakes for the static test can free the vehicle to roll if the setup is careless. Securing the vehicle first makes the measurement safe as well as accurate.
Manual topic: Air Brakes - Air Leakage and Brake Tests · From the Air Brakes practice bank (AB-087).