Things You'll Need:
- Brake master cylinder Vise Brake fluid Phillips screwdriver Rubber plugs Wrench
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Step 1
Place the master cylinder into a vise. Clamp the vise's jaws onto the cylinder's mounting flange. Connect the bleeder tubes to the cylinder's outlet ports.
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Step 2
Fill the master cylinder reservoir with brake fluid. Use the exact type of brake fluid required for the vehicle you are installing the master cylinder onto.
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Step 3
Press the master cylinder's pistons slowly into the cylinder using a Phillips screwdriver or similar device. This will expel the air out of the cylinder and into the reservoir--you will see air bubbles in the reservoir. Release the pistons; this won't draw air back into the cylinder, since the tubes are submerged in fluid.
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Step 4
Repeat the process of pressing the pistons until you no longer see air bubbles from the reservoir.
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Step 5
Remove one bleeder tube from the cylinder outlet port and quickly replace it with a rubber plug to keep fluid from escaping and more air from entering. Repeat for the other bleeder tube and port.
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Step 6
Install the master cylinder onto the vehicle by mounting it in place on the brake booster, threading the brake lines into the cylinder's outlet ports (after removing the plugs) and tightening all mounting nuts to the appropriate torque. Make sure the reservoir has the correct amount of fluid.
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Step 7
Loosen the fittings connecting the cylinder to the brake lines while an assistant presses down on the brake pedal. Do this with one fitting at a time until no more air bubbles come out and then move to the other fitting.
