Title: Repair or replace the hydraulic brake assist (booster), hoses, and control valves.
Course: Diesel Equipment Technology I (20107-I) > Section: Brakes: Servicing the Power Assist Units

Repair or replacement should include inspecting the power steering system, hoses, and hydro boost for proper operation.

Process/Skill Questions:

- What is the operation of a hydro boost system?
- What part of the hydro boost unit acts as a reserve?
- What might cause a hard brake pedal?