In case it has been realized that the master cylinder is faulty, then it is necessary to change it with a new one, whereas the fluid reservoir seals, are the only parts that can be serviced. Start with emptying the reservoir with a syringe, suction gun or poultry baster, being careful to rinse off all the spilled brake fluid with cold, clean water so as to avoid leaving paint on the reservoir. Disconnect the electricity connector of the fluids level warning switch and lay rags underneath the fittings and set up caps or plastic bags to cover the disconnected ends of the lines. Detach the brake fluid line to the fluid reservoir and plug to avoid contamination in vehicle having a manual transaxle. Loose the fittings at the terminals of the brake lines as they enter the master cylinder with a flare-nut wrench so as not to round the flats off and then pull away the brake lines and insert the terminals. Unscrew the nuts that hold the master cylinder to the power booster and unscrew the master cylinder in the cowl region, not to spill the fluid. Take off the old O-ring on the end of the master cylinder and disregard. Bench bleed This should be done before the new master cylinder is installed with the recommended brake fluid by mounting it in a vise and connecting bleeder tubes to the outlet ports and forcing the pistons slowly to expel all the air. Continue the process till all of the air bubbles have come to pass and remove the bleed tubes and place plugs in the open ports. Install a new O-ring on the end of the master cylinder, insert it into the power
Brake Booster and screw on the nuts that connect it on the power brake booster using fingers. Install the fittings of the brake line in the master cylinder, not stripped, and screw the mounting nuts and the fittings in place. Fluid fill master cylinder reservoir, bleed the lines at the master cylinder then bleed the rest of the brake system, and scrutinize the functioning of the brake system before driving to ensure it is functioning. In case there is a damage to the brake fluid reservoir, the reservoir can be replaced independently of the master cylinder body and in case of leakage between the reservoir and the master cylinder body, the grommets may be changed. Take the fluid out of the reservoir, put the rags under the master cylinder to wipe off the spills, and drag the reservoir out. In case of grommet replacement, you should pry the old grommets out and put new ones in, lubricating them with clean brake fluid prior to stickinging reservoir back in to position. Top up the reservoir with the prescribed brake fluid and ensure that there are no leaks and then bleed the master cylinder.