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