The correct procedure to prime a brake master cylinder involves using only DOT 3 brake fluid due to safety reasons because alternative fluid types will damage it permanently and disable brake functionality. Take caution when handling brake fluid since exposure to your eyes must be avoided and hand washings should be thorough after completion of use. When eyes do come into contact with fluid, seek medical help if continuous irritation occurs. Main tasks in the bleeding operation require full reservoir filling only with recommended brake fluid while discarding used fluid because exposed brake fluid affects painted surfaces and plastics. Air will enter any disconnected hydraulic system part, so bleeding operations will be necessary after reconnection. When performing in-vehicle priming, the user should disconnect
Brake Lines from the brake master cylinder, while bench priming requires placing the brake master cylinder inside a vise. The reservoir needs short brake tube deviations that lead into it while users must use either High Performance DOT 3 Brake Fluid C6AZ-19542-AB or a DOT 3 equivalent which meets Ford specification ESA-M6C25-A. Assembling a new brake master cylinder requires users to loosen the speed control pressure switch followed by a slow depression and holding of the primary piston or having assistance from another person who tightens the switch. Use this method until air bubbles disappear from the fluid stream that exits the system and pump the
Brake Pedal to produce clear fluid through both tubes. The installation process requires fitting the brake master cylinder to the vehicle, after which both short tubes must be uninstalled and the outlet tubes can be installed. A technician should loosen the outlet tube at the 4WABS hydraulic control unit (HCU) while an assistant holds the brake pedal during the tightening process of the outlet tube fitting. Perform the process another time until the brack of bubbles disappears before moving on to the second tube. Install a flexible tube on the brake master cylinder bleeder screw before submerging its opposite end into brake fluid. Then proceed under instruction from an assistant who will operate the brake pedal and pump the cylinder. You should maintain the bleeder screw loosened until the fluid appears while repeating this step until air bubbles no longer emerge. Finally, bleed the brake system.