Ford Mustang (1999-2004) Service Manual: Brake Booster - Vacuum (Description and Operation)
Power Brake Booster


The vacuum type power brake booster (2005):
- is a dual diaphragm, vacuum assisted power brake booster
- reduces brake pedal force and travel distance.
- is located on the LH side of the bulkhead in the engine compartment, between the brake pedal (2455) and the brake master cylinder (2140).
- is divided into separate chambers by the diaphragms.
- will not operate if vacuum is restricted or if any of the vacuum related power brake components fail.
- is installed as an assembly.
If the power assist fails, the brake system will continue to operate with increased brake pedal effort.
Hose and Check Valve
The power brake booster check valve (2365):
- is located on the front of the power brake booster.
- is installed separately; (install a new grommet when installing a new check valve).
- is positioned between the power brake booster and the power brake booster hose.
- closes when the engine is turned off.
- in the closed position, traps engine vacuum in the power brake booster
- retains vacuum to provide several power assisted brake applications with the engine off.


Power Brake Actuation
Torque Specifications
...
Brake Booster - Hydro-Boost (Description and Operation)
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 brak ...
Other materials:
Hose
Special Tool(s)
Installer Set, Teflon Seal
211-D027 (D90P-3517-A) or
equivalent
Removal and Installation
CAUTION: While servicing the power steering system, make sure to plug
all open hoses,
line fittings, and fluid ports to prevent the entr ...
Piston
Material
Item
Specification
Super Premium SAE 5W-20
Motor Oil
XO-5W20-QSP or equivalent
WSS-M2C153-
H
Disassembly
1. Press the piston pin out of the connecting rod and piston assembly.
2. Remove the connecting rod from the piston.
3. ...
Manual transmission
Using the Clutch
Manual transmission vehicles have a starter interlock that prevents
starting the engine unless the clutch pedal is fully pressed.
To start the vehicle:
1. Make sure the parking brake is fully set.
2. Press the clutch pedal to the
floor, then ...
