Title: Identify components of the brake power assist system (vacuum and hydraulic); check vacuum supply (manifold or auxiliary pump) to vacuum-type power booster.
Course: Automotive Technology I (20104-I) > Section: Brakes: Power-Assist Units

Procedure should include

- removing the vacuum supply hose to booster and checking with a gauge
- testing brake pedal by depleting the reserve
- restarting the engine.

ASE Education Foundation
2017 Maintenance and Light Repair (MLR) Level
V. Brakes
E. Power-Assist Units
Task 2

Process/Skill Questions:

- How should vacuum supply be checked?
- How much vacuum is enough?
- What causes a hard brake pedal?