Hi there, often this can be sticky brake calipers, or faulty brake hoses, but if both are doing it at the same time, you may have a problem with the master cylinder or proportioning valve, you will have to check out if it is a hydraulic or mechanical problem first, if you can crack a bleeder when the brakes are locked, if fluid releases and the brakes back off, this will normally be a hydraulic problem.
Mark (mhpautos)
Dec 11, 2009 at 2:44 PM