Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Is it all four wheels locking up, or just one axle?
I'd suggest getting the wheels to lock, jack up the locked wheel and loosen the nuts that attach the master cylinder to the hydroboost. If the wheels unlock, then you've got a few suspects. One, the pushrod between the booster and the master is too long, causing the master to stay partially applied. Adjust as needed. Two, something is causing the brake pedal hang applied, or not return to it's rest position. Three, your replacement hydroboost sucks. :silly:
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