Jack up the front of the truck, and rotate the wheels. If you can feel a drag, loosen the nuts on the mastercylinder and pull it away from the booster. If the drag goes away you found your problem. I have also seen new mastercyclinders right out of the box be defective and do this. Good Luck
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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