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I have 1981 Interstate that the front brake calipers will rub when applied and let off, thus locking down and making unrideable. I have rebuilt the mastercylinder and rebuilt calibers. I think the rotors are warped. Is there a place to get everything I need to fix this cheap? Bike runs great and right now I bleed front brakes and dont use so I can ride....but its not the safest ride right now.
 

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have you tried ebay for some used rotors
 

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+1 on the little hole in the MC need to be cleaned out......get some piano wire to run through the hole to clean it out.
 

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Another thing to check is to be sure that the MC piston is returning fully. A partially depressed MC piston will block the fluid return hole.

Another is to be sure that the MC is not overfull causing the brakes to be applied as the fluid heats and expands.


I cleaned it out. Thanks for the tip. Still didnt fixing the rubbing. Safe to say the rotors are warped. I found a guy selling a complete front wheel with rotors, calipers, etc. His bike is a '75. Do any of those components carry over to a '81?
 

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Have you actually checked the runout variance of the rotors? If they are warped even a little it will be measurable and also noticeable with free spinning the front wheel slowly with it elevated. There would be a noticeable pulse in the rotation of the wheel and rotor with very little pressure from the caliper(s). Not saying, just saying.;)
 

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Have you actually checked the runout variance of the rotors? If they are warped even a little it will be measurable and also noticeable with free spinning the front wheel slowly with it elevated. There would be a noticeable pulse in the rotation of the wheel and rotor with very little pressure from the caliper(s). Not saying, just saying.;)
+1 = Trust but verify!

I once knew a guy whose brakes stuck because the pins and springs the pads travel on were pinched or something and had no anti-sieze grease on them (pins) so they just hung up instead of travelling freely.
 

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Might tyr and see if a member of this site has some used rotors to buy. Goes by the handle "Cantankerous" He has aprted out bikes.
 
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