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If you are talking about just bleeding the brakes system, you shouldn't have to bleed it at the master cylinder. The sequence should start with RR, LR, RF, LF, have someone pump the brakes for you if you are just using a hose to bleed the system. Connect one end of the hose to the bleed valve, and submerge the other end to a container with some brake fluid in it. Pump the pedal a few times and then hold it down, open up the bleed valve and let the fluid out. When the pedal goes down to the floor, tighten the valve. Do this on each wheel a few times, keeping an eye on the fluid level in the master cylinder. Always close the valve with the pedal down, but with the hose in the container with fluid there is less chance of air re-entering the system.
To bleed the new master cylinder, you can bench bleed it, by clamping the master cylinder down with a vise, fill the reservoir up first, then just let it gravity bleed for a little bit until you see fluid coming out of the ports. Then cover the ports up with your fingers or buy a kit to re-direct the fluid back into the reservoir. You can bleed it further to get all the air out but it does get messy if you don't have any means of re-directing the fluid back into the reservoir. Or you can use the pedal in the car and the lines as a means to finish bleeding the M/C. Mount the M/C in the car, snug the lines down while holding the pedal to the floor. Then pump the pedal a few times, crack the lines loose to let the air out. Do this until you have a firm pedal. Then go through the bleeding process above for all wheels.
Others may have different ways of doing this, I use this way when I don't have my vacuum bleeder with me.
N.E.O.
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