OEM Ford Explorer Sport Trac Brake Master Cylinder

Ford Explorer Sport Trac Brake Master Cylinder Parts and Q&A

• Master Cylinder
  F87Z-2140-AC
  Q: How to properly prime the brake master cylinder using DOT 3 brake fluid on Ford Explorer Sport Trac?

  A:

  When priming the brake master cylinder from either a vehicle or lab setting, utilize DOT 3 brake fluid exclusively because using alternative fluids will result in permanent damage that creates an inoperable braking system. When handling brake fluid, handle it properly since direct eye contact should be prevented and complete hand washing becomes necessary after finishing; if fluid contacts your eyes, flush them with water for 15 minutes followed by medical assistance if eye irritation persists. The bleeding operation requires maintaining the brake master cylinder reservoir with the correct fluid type and avoiding reuse of hydraulic system fluid because it will damage painted surfaces and plastics. Any hydraulic system disconnection may introduce air, which requires a bleeding procedure following system reconnection. You can perform in-vehicle priming when you disconnect Brake Lines from the brake master cylinder or bench priming from mounting the brake master cylinder into a vise with short brake tubes bent into the reservoir. The reservoir requires High Performance DOT 3 Brake Fluid C6AZ-19542-AB or a DOT 3 equivalent product that meets Ford specification ESA-M6C25-A. Before using a new brake master cylinder, you should loosen the speed control pressure switch while having an assistant slowly press the brake pedal or manually press the primary piston. To remove air bubbles from the fluid outlet, perform the speed control pressure switch tightening procedure until no more bubbles exist. Push the brake pedal or depress the primary piston so clear liquid flows out from both tubes without any sign of air bubbles appearing. Finally, install the brake master cylinder inside the vehicle and cut off short tubes while attaining outlet tubes into place. An assistant should maintain pressure on the brake pedal after allowing the brake outlet tube at the 4WABS HCU to gently loosen while regularly refilling the reservoir when needed. Assume tightness of HCU outlet tube fittings while repeating the procedure until the expelled fluid shows no bubbles present before doing it for the other outlet tube. A flexible tube should connect to the brake master cylinder bleeder screw while directing the other end into a container that contains brake fluid. The assistant should hold down the brake pedal while using the bleeder screw to loosen, then close it when fluid begins to exit. To complete this procedure, continue until the expelled fluid shows no air bubbles and then commence the brake system bleed.
• Master Cylinder
  8L2Z-2140-B
  Q: How to service and repair the brake master cylinder on Ford Explorer Sport Trac?

  A:

  All service and repair tasks on the brake master cylinder start with disconnecting the battery ground cable. A suitable suction device should be used to drain the brake master cylinder reservoir and workers should disconnect the brake fluid level warning switch electrical connector and the two brake tube fittings from the brake master cylinder before torquing each component to 18 Nm (13 ft. lbs.). The service of the brake master cylinder begins with unfastening its two retaining nuts followed by removal of the square cut seal which should be refitted with a torque of 25 Nm (18 ft. lbs.). Installation of the square cut seal must be proper to prevent feeling what is known as incorrect brake pedal feel. The braking system requires bleaching with a proper brake system protocol after returning all components to their original position. Always employ DOT 3 brake fluid when maintaining brake components while washing off any brake fluid spills from painted or plastic surfaces using water immediately. In case of emergency brake fluid needs, contact Ford/Motorcraft products at 1-800-959-3673 both inside and outside the United States for medical advice.