Ford 2003 Mustang Workshop Manual page 633

SECTION 206-07: Power Brake Actuation
DESCRIPTION AND OPERATION
Brake Booster —Hydro-Boost
The Hydro-Boost brake booster is a hydraulically operated brake booster powered by the power
steering pump (3A674). The power steering pump provides the fluid pressure to operate both the
power brake booster and the power steering gear (3504).
A Hydro-Boost reserve system (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.
For low assist concerns on vehicles equipped with the Hydro-Boost system, refer to
check the power steering pump pressure and flow.
Item Part Number
1 2140
2 2B559
The brakes can also be applied manually if the reserve system is depleted.
Any leakage goes directly back to the power steering pump reservoir (3E764).
Description
Master cylinder
Hydro-Boost
2003 Mustang Workshop Manual
Section 211-00 to