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Cant get brakes to bleed..

Ihave a 1989 harley sportster and i cant get the brakes to bleed..ive stripped the macter cylinder,cleaned and reassebled it..everything was as it should be going by the manual but the master cylinder dos'nt seem to be doing anything..even when ive removed the pipe from the caliper and capped the ends of with my fingers..its seems to create more of a vacum than pressure..any ideas greatly appreciated as the problem is driving me

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Easier to do from the bottom up.... (bubbles rise...right!)

You can get a pump at an auto parts store - I made one with a syringe and a peice of tubing. Attack the tube to the nipple at the caliper. Open the resavoir and fill the pump with fluid. Force it slowly up through the calpier, let it overflow the res. When the bubbles stop, close the nipple. If dual caliper, do the bottom, then the top. Close the system and pump the brakes a few time. that should do it

Posted on Oct 19, 2008


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A common problem with the single pot disc brake system.
I find that I have to remove the bleed nipple completely before I can shift it and then the fun begins flushing the fresh fluid through and getting rid of the air.
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It's not you, it's the design. Keep on going, it will work in the end.

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Go here to see an exploded view of your front master cylinder.

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