Buick 15142479 Cylinder,Brake Master

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To disassemble the Brake Master Cylinder, it is necessary to join the cable from the negative terminal of the battery and also to disconnect the electrical connector for the fluid level warning switch. Suction out the reservoir by using a suction gun, a large syringe or poultry baster after which lay rags on the fittings in order to absorb any spills that may occur when the lines are disconnected and prepare caps or plastic bags to cover the end of the lines after disconnecting them. Remove the nuts on the ends of the brake lines where they are connected to the Brake Master Cylinder; to do this, use a flare-nut wrench so that the flats are not rounded off, then pull the brake lines out and plug the ends to avoid contamination. The Brake Master Cylinder should be disconnected from the power brake booster; therefore, the nuts securing the two components have to be taken off. For installation, bench bleed the new Brake Master Cylinder by using a set of bleeder tubes inserted into the outlet ports place it in a vise and fill the reservoir with the recommended brake fluid for a while. Gradually, the pistons have to be advanced into the Brake Master Cylinder in order to force out the air, and this must be done until there is no more bubble visible. When bleed tubes are disconnected then plugs are fitted, the Brake Master Cylinder should be positioned over studs of the power brake booster with new gasket and nuts tightened until finger tightness. Slide the brake line fittings into the Brake Master Cylinder taking consideration on the male threads not to stripped, then tighten the mounting nut and fittings. Pump the brake fluid into the reservoir, unscrew the line connections at the Brake Master Cylinder and let an assistant press down the brake pedal as the fittings are opened and the air/brake fluid mixture is vented until the brake fluid gives a ringing sound when dropped in a metal pan. Lastly check whether all the brake system is in proper working condition before going for a drive. For reservoir or O-ring replacement, do not strip the Brake Master Cylinder of brake fluid, put some rags beneath the Brake Master Cylinder. Remove the roll pins that hold the reservoir, then pull it out, if you are replacing the O-rings then pop off the old ones and install new ones after which it is recommended that you lubricate the O-rings with fresh brake fluid before fixing the reservoir using the new roll pins. Replace the brake fluid in the reservoir with the recommended type and look for any weeping at the Brake Master Cylinder before bleeding the latter as done above.