GMC 19420962 CYLINDER ASM,BRK MAS

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The brake master cylinder is located in the engine compartment and mounted on the power brake booster. Remove the brake master cylinder by first extracting as much fluid from the reservoir as possible using a syringe or turkey baster. Place rags under fluid fittings and get caps or plastic bags to cover ends of lines when disconnected. To avoid contamination, loosen connectors at the ends of brake lines and fill up their other sides. If there is one, unplug electrical connection from the brake fluid level switch and then detach nuts which hold down brake master cylinders to power boosters. Carefully take off a brake master cylinder from studs (or pins) inside an engine compartment. When mounting a new one, take out that reservoir from old part and put it into a newly bought one for it to be installed properly. For instance, set up this device in vices before bench bleeding it by connecting bleeder tubes over outlet ports; then pour some hydraulic liquid into this container with slow compression of pistons in order to remove air inclusions; keep repeating such procedures until no more bubbles appear during these processes; eventually you should remove these tubes while putting plugs into empty openings; after screwing these devices back onto power boosters of vehicles tighten their fastening elements with great care; while filling given container with fluid go ahead with bleeding operations concerning this particular element combined with entire mechanisms controlling cars' performance on roads today; and finally check if brakes work good enough before giving permission to use your autos under normal conditions again. Take away most of oil present in case you want to replace this container itself or even just o-ring seals: so detach reservoirs out of braking systems' masters but lubricate new seals before they are slipped on both connections again so that it can be fixed firmly right there; refill tanks using such oils tightly sealed against leakage-thus processing may be considered completed only after everything has been checked once more together via initial bleeding points which are guaranteed to be followed strictly.

To remove the brake master cylinder, first disconnect the cable from the negative battery terminal and unplug the electrical connector for the fluid level warning switch. Remove as much fluid as possible from the reservoir and prepare caps or plastic bags to cover the ends of the lines once they're disconnected. Loosen the fittings at the ends of the brake lines where they enter the brake master cylinder and pull the brake lines away from the brake master cylinder, plugging the ends to prevent contamination. Remove the nuts attaching the brake master cylinder to the power booster and pull the brake master cylinder off the studs. To install the new brake master cylinder, bench bleed it before installing it by mounting it in a vise and attaching a pair of brake master cylinder bleeder tubes to the outlet ports. Fill the reservoir with brake fluid of the recommended type and slowly push the pistons into the brake master cylinder until no more air bubbles are present. Remove the bleed tubes and install plugs in the open ports to prevent fluid leakage and air from entering. Replace the o-ring seal on the end of the brake master cylinder and install it to the booster, leaving the mounting nuts finger tight for now. Thread the brake line fittings into the brake master cylinder and tighten the mounting nuts to the torque specifications. Fill the brake master cylinder reservoir with fluid, then bleed the lines at the brake master cylinder, followed by bleeding the remainder of the brake system. Confirm that the brakes are fully operational before resuming normal driving.

The master cylinder is located in the engine compartment and is mounted to the power brake booster.

Bench bleed the new master cylinder before installing it.

Remove the nuts attaching the master cylinder to the power booster and pull the master cylinder off the studs.