I looked at a fairly nice 73 Duster today (4500 bucks) But there is a strange problem with the brakes. It stops just fine, good pedal feel, but after 10 or so minutes of driving, the front calipers start to grab, it doesn't lock the tires up but if you put it neutral the car will start to slow down & eventually stop by itself. the owner said after the car sits ( overnight presumably) the brakes are fine again. Whats up with this car ? Any ideas?