Section 06-00: Brake System, Service | 1996 F-150, F-250, F-350, F-Super Duty Chassis Cab, Motorhome Chassis and Bronco Workshop Manual |
Hydraulic type power brake boosters (2005) have the potential to provide greater boost. They are especially effective on diesel-powered vehicles and vehicles that need extra boost to handle the demands of 4-wheel disc brakes. The higher boost capability of the hydraulic power brake booster produces a different pedal feel than the vacuum type power brake booster.
A hydraulic boost system gets its boost from pressure developed by the power steering pump (3A674).
The power steering pump provides the fluid pressure to operate both the power brake booster (Hydro-Boost) and the steering gear (3504).
A Hydro-Boost reserve system (compressed gas accumulator) stores sufficient fluid under pressure to provide at least two power-assisted brake applications in the event the power steering pump fluid flow is interrupted.
The brakes can also be applied manually if the reserve system is depleted.