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Kirk You need to be systematic with your checks and a good starting point is to suspect that the interior of the rear brake hose is collapsing. This occurs on many cars when the hose interior collapses and starts to act like a one way valve , eventually locking up the brakes. If you find that is the issue, then change the front hoses also AND ENSURE you flush the system, otherwise all the sediment from the hose interior is going to cause further problems.