GM 84118589 Cylinder Kit, Brake Master

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In order to pull the Brake Master Cylinder out you will need to press the brake pedal several times, if there is a vacuum in the brake booster, the O-ring will be compressed in. The Brake Master Cylinder itself is mounted on the lower part of the firewall at the left rear of the engine compartment near the brake booster. Make certain that the ignition switch is turned off, then press the brake pedal several times to waste the brake booster reserve vacuum. If necessary, there is an engine cover that you can pull up for even more space. It is better to use a syringe, or any small vessel, which you might have used in a previous year to scoop the maximum amount of the fluid as can be withdrawn from the reservoir. Do not remove any hose connections or drain any coolant - simply remove the coolant expansion tank and put it to one side. Unplug the electrical connector of the brake fluid level switch positioned on the Brake Master Cylinder reservoir but before doing this place rags around the fluid fittings where you will be disconnecting the lines and prepare caps or plastic bags to cover the these ends of the lines. Debris around the brake line fittings need to be removed in order to prevent it from getting into the brake system; painted surfaces are vulnerable to brake fluid. Two of the bolts at the end of brake lines that connect to the Brake Master Cylinder should be loosened using a flare-nut wrench so as not to round the corners. The brake lines can be pulled slightly apart and the ends plugged. Depress the Brake Master Cylinder from the power booster where the nuts fasten it, and you should do this carefully in order not to spill any of the fluids. The reservoir can be detached from the Brake Master Cylinder, with the aid of a vise: Unscrew the retaining pin while tapping the reservoir, or if there is one, unscrew the retaining bolt. New res seals must be smeared with brake fluid before they are fitted on the new Brake Master Cylinder and fitted tightly before the reservoir is pressed in place and secured by a retaining pin or bolt in its place. Before to install you need to bench bleed the new Brake Master Cylinder: put it, for example, in a vice and connect the bleeder tubes to the outlet ports. The brake fluid is then poured into the reservoir to the recommended level and the pistons are more slowly pushed into the Brake Master Cylinder to force out the air bubbles into the reservoir until none is seen. After removal of bleed tubes, put plugs in the other remaining ports and the reservoir cap. Fit a new O-ring with the threads of the Brake Master Cylinder sleeve, then place the Brake Master Cylinder over the studs of the power brake booster and tighten the nuts slightly. Screw on the brake line fittings in the Brake Master Cylinder and make sure that they do not get stripped by applying little force if needed. Hex the mounting nuts to the torque setting and fix the brake line fittings. Refill the Brake Master Cylinder reservoir with fluid, next, open the fitting on the Brake Master Cylinder to release the air as the brake pedal is pumped by an assistant until the discharging fluid is free from bubbles. For any dripping, use the rags and after bleeding the area under the Brake Master Cylinder should be washed with fresh water. Last of all, check on how the brake system functions properly before going back to regular traffic or usage of the vehicle.