Title: Inspect a vacuum-type power booster unit for leaks; inspect the check-valve for proper operation; determine the needed action.
Course: Automotive Technology III (20104-III) > Section: BRAKES: Power-Assist Units Diagnosis and Repair

Inspection should include

- listening for noise (e.g., hissing, air leaks)
- depressing the brake pedal and releasing it
- checking the reserve
- restarting the engine.

Process/Skill Questions:

- How does a vacuum booster operate?
- What are the procedures to inspect and check the operation of a vacuum booster?
- What is the operation of the check valve and vacuum valve?