Hi stephen1907. Welcome to the forum. You obviously know more about this system then most people, and you've already replaced the two most likely suspects, the hoses and calipers. Next, check the rubber bladder seals under the reservoir caps. If they are blown up and mushy, the fluid is contaminated with petroleum product. If the cap seals appear ok, when the brakes lock up again, stop on a slight incline, put a block a few inches downhill from one of the tires, then open the bleeder screws and see if one of the calipers releases. If it does, try that again by loosening the steel lines at the master cylinder. Where the pressure will or will not release will provide the clue. To solving the mystery of the locking brake.
Caradiodoc
SPONSORED LINKS
Friday, April 30th, 2010 AT 7:17 PM