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The front brakes keep locking up. You can crack the bleeders open and ride again but they will lock up again. I rebuilt the calipers and master cylinder. Flushed the system, cleaned everything. Put on new pads and still doing it. Any ideas?? Maybe it needs new break lines??
 

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Which braking system, front, back, or both?What did you do when the calipers and master cylinders were rebuilt?
What did you use to clean brake components?


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The problem, as you describe it, seems like the system is building up pressure when everything heats up. This is usually caused by a plugged relief hole in the master cylinder. Remove the master cylinder cap, peer down and at the bottom, you will see two small holes. Take a stiff nylon bristle and run it through both holes to ensure that they are clear. I do not recommend using a wire, etc as these holes are soft and the master cylinder cup is right there.

Post back with your results.
 

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As an add, brake clean is usually not recommended to come in contact with rubber parts, so if it has, that could be another issue.
 

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If you ride along, they lock up, and you crack the master cylinder bleeder and you have pressure there, then there is some type of blockage in the master cylinder that is preventing the fluid return to reservoir. If the hole is free, then possibly the cylinder has been assembled incorrectly.

If you crack the upper bleeder and no pressure, crack the lower bleeder and there is pressure, then you most likely have a bad rubber brake line.

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If you ride along, they lock up, and you crack the master cylinder bleeder and you have pressure there, then there is some type of blockage in the master cylinder that is preventing the fluid return to reservoir. If the hole is free, then possibly the cylinder has been assembled incorrectly.

If you crack the upper bleeder and no pressure, crack the lower bleeder and there is pressure, then you most likely have a bad rubber brake line.

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X2^^^^^
The maintenance schedule recommends new front brake hoses every 4 years. Yours are likely the originals, so are due for replacement.

Check out these SS lines on ebay:
http://cgi.ebay.com/ebaymotors/FTP-VN750-Vulcan-2006-2008-SS-Front-Brake-Lines-_W0QQcmdZViewItemQQhashZitem562d0540d3QQitemZ370122506451QQptZMotorcyclesQ5fPartsQ5fAccessories
 
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