Title: Inspect the brake relay valves.
Course: Diesel Equipment Technology II (20107-II) > Section: Brakes: Servicing Air Brakes

Inspection should include

- operating the treadle valve and checking the brake chambers for even application
- checking the hoses from the brake relay valve to the brake chambers for blockage or leakage.

ASE 1: III. Brakes: B. Air Brakes: Air Supply and Service Systems (P-1)

Process/Skill Questions:

- How does  the relay valve operate?

- What types of evidence indicate a defective relay valve?
- How can the brakes operate if the relay valve is not functioning properly?