Title: Inspect the tractor protection valve.
Course: Diesel Equipment Technology II (20107-II) > Section: Brakes: Servicing the Air Brakes

Inspection should include

- chocking the wheels before beginning
- starting the engine to build air pressure to 120 psi
- turning the engine off and listening for air leaks
- applying the brakes until air pressure reaches 60 psi.

Process/Skill Questions:

- What might cause a valve to leak when released?
- How long should it take to build the air pressure?