Brake Booster (Hydro-Boost)

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2003 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Some Excursion and Super Duty Pickups use a Hydro-Boost system. See Figure. The Hydro-Boost brake booster is a hydraulically operated brake booster powered by the power steering pump. The power steering pump provides the fluid pressure to operate both the power brake booster and the power steering gear. A Hydro-Boost reserve system (accumulator) stores sufficient fluid under pressure to provide at least 2 power-assisted brake applications in the event the power steering pump fluid flow is interrupted. For low assist concerns on vehicles equipped with the Hydro-Boost system, check the power steering pump pressure and flow, see appropriate POWER STEERING article in STEERING. The brakes can also be applied manually if the reserve system is depleted. Model identification is stamped into the power brake booster housing near the power steering pressure hose. Any leakage goes directly back to the power steering pump reservoir.