Ford F150 Pickup. Instruction — part 435

Fig. 98: Installing Brake Pressure Switch
Courtesy of FORD MOTOR CO.

7. Install the brake master cylinder. For additional information, refer to BRAKE MASTER CYLINDER .

8. Fill the brake master cylinder reservoir with High-Performance DOT 3 Brake Fluid C6AZ-19542-AB or

equivalent DOT 3 fluid meeting Ford specification ESA-M6C25-A and install the brake master cylinder
filler cap.

2003 Ford Pickup F150

2003 BRAKES Hydraulic Brake Actuation - F150 Pickup

Fig. 99: Filling Brake Master Cylinder Reservoir
Courtesy of FORD MOTOR CO.

9. Bleed the brake master cylinder. For additional information, refer to BLEEDING BRAKE SYSTEM .

2003 Ford Pickup F150

2003 BRAKES Hydraulic Brake Actuation - F150 Pickup

2003 BRAKES

Power Brake Actuation - F150 Pickup

SPECIFICATIONS

TORQUE SPECIFICATIONS

Fig. 1: Power Brake Actuation Torque Specification
Courtesy of FORD MOTOR CO.

DESCRIPTION AND OPERATION

BRAKE BOOSTER

The power brake booster (2005):

z

is a dual diaphragm, vacuum assisted power brake booster.

z

reduces brake pedal pressure and travel distance.

z

is located on the LH side of the bulkhead in the engine compartment, between the brake pedal (2455) and
brake master cylinder (2140).

z

is divided into separate chambers by the diaphragm.

z

will not operate if vacuum is restricted or if any of the vacuum related power brake components fail.

z

is replaced as an assembly.

If the power assist fails, the brake system will continue to operate with increased brake pedal effort.

Hose & Check Valve

The power brake booster check valve (2365):

z

is located on the front of the power brake booster.

z

is positioned between the power brake booster and the power brake booster hose.

z

closes when the engine is turned off.

2003 Ford Pickup F150

2003 BRAKES Power Brake Actuation - F150 Pickup

2003 Ford Pickup F150

2003 BRAKES Power Brake Actuation - F150 Pickup

z

in the closed position, traps engine vacuum in the power brake booster.

z

retains vacuum to provide several power assisted brake applications with the engine off.

Fig. 2: Identifying Power Brake Booster Components
Courtesy of FORD MOTOR CO.

DIAGNOSIS AND TESTING

POWER BRAKE SYSTEM

Refer to DISC - BLACKWOOD, F150 HERITAGE PICKUP & F150 PICKUP .

GENERAL PROCEDURES

PUSH ROD ADJUSTMENT

2003 Ford Pickup F150

2003 BRAKES Power Brake Actuation - F150 Pickup