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Rebuilt the rear m/c and now I can't get it to pump fluid. All of the seals are in correctly, but it won't build pressure. I did a search for my problem, and found out I need a vacuum bleeder. Is this the only way? Thanks,
Justin
Try this method, it always works for me.
Take off the banjo bolt and line, and pump the pedal, but before you let the pedal go put your finger or thumb over the master cylinder fluid line hole. Then let off the pressure at the pedal and then release your finger or thumb, and you will hear a popping sound as the vacuum is released. Do this a few times and fluid should start to flow. Obviously connect everything back together, and then bleed up as normal.
You have to open the bleed screw a bit. Place a piece of vinyl tube on the nipple of the bleed screw, tying it with a piece of wire or ty-wrap. Put the end of the tube into a catch cup.Open the reservoir and pour a full amount into the cup. Leaving the reservoir open push down on the brake lever. holding the brake lever in the down position close the bleed screw. This prevents air from backing up into the system. Release the lever, and repeat. Once you have the vinyl tube full sticking down into fluid in the catch can, then you can stop holding the lever while you close the bleed screw. All you have to do is keep the reservoir full and pump until the tube shows that the fluid in the system is clear and you can close the bleed screw and top off the reservoir, and close up. If the above cannot be done, then something is wrong with your rebuild or you are sucking air from other source, maybe a defective hose.
Another thought occurred. The bleed screw may be clogged up. I had this to happen. I had to take the bleed screw out completely and get the harden junk out as that was blocking the fluid bleed. Once the screw was clean the fluid started to flow.
I just did both of my master cylinders, and when I got done and tried to pump them up and bleed them, I couldnt get them to do anything either. So I hooked up a squeeze bottle full of fluid and attached a hose to it and the bleeder screw and opened the screw a bit. I then squeezed until the fluid came up in the reservoir. I then closed the screw and pumped the brake and then opened the screw and the bottle sucked the bubbles out (make sure it is above the level of the screw). Keep adding fluid to the reservoir so it doesn't run dry.
The first time I didn't clean the spooge hole, and that gave me trouble. So check that.
That worked for me. Good luck!
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