I have no idea why my drivers brake locks up on my 65 mustang. its got manual front drum brakes with a single resivour master cylinder, and i've tried everything to get them working properly but no luck. whenever i put any pressure on the brakes the drivers side just locks up no matter how tight/loose I adjust both sides. The brakes and all the hardware look like they are all in excellent condition and I just had the drums turned. any ideas?