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  #1 (permalink)  
Old 08-24-2011, 01:04 PM
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PM Brake Problem

I have PM brake levers and 6 piston front brakes on my custom bike I built. They worked fine since I built it up. The bike sat for a year and when moving the bike to start it the brake went from full brake to a full dead lever. I tried to bleed it with out any luck multiple times lever still totally dead. The one think I noticed is very small air bubbles come out of the bleed screw when it is shut and I pump the brakes. Can you let me know what you may think it is. Thanks
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Old 08-24-2011, 03:08 PM
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may take a while to bleed all air out of system. Front brakes usally take longer had sim. trouble.
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Old 08-25-2011, 06:17 PM
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tried everything but nothing
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Old 08-25-2011, 06:27 PM
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You need to isolate the problem, use a vise grip to pinch the brake hose and pull the lever, if it's rock hard the master cylinder is fine, if not you need to tear the m/c apart. If the m/c is fine then you need to disassemble the caliper. If I were to guess you have a couple of sticky pistons that need to be made free.
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Old 08-28-2011, 09:43 PM
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I agree, keep pumping,,, I have the same setup
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Old 08-29-2011, 08:29 AM
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Pumping the master cylinder is futile when there is air in it.

You have to gently coerce the unit to remove all the air.

The air is coming from somewhere and finding the source of the air is the first and most important thing to do.

Just blindly pumping the master cylinder will not get it done!

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Old 08-29-2011, 09:19 AM
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I understand, yes your right to find air source first.
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Old 08-29-2011, 09:37 AM
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there should be no bubbles, no nothing coming out of the bleed screw if its closed if I understand your feedback correctly.
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