Title: Check the emergency (spring) brake control/modulator valve, if applicable.
Course: Diesel Equipment Technology I (20107-I) > Section: Preventive Maintenance and Inspection: Servicing Air Brakes

Checking should include inspecting and testing, based on

- DOT guidelines
- the description of normal operation.

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

Process/Skill Questions:

- What are common reasons for the emergency (spring) brake control/modulator valve not working as designed?
- Why is the spring brake important?
- Why is it important to put the correct valve on the tractor and on the trailer?