Title: Identify components of the brake power assist system (vacuum and hydraulic); check the 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 the brake pedal by depleting the reserve
- restarting the engine.

Process/Skill Questions:

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