hey i recently converted my rear brakes to disc on my 64, and now after about 10-15 minutes of driving the brakes get tight and kina lock up. this causes the car to over heat. anyone had this problem? could it be my booster or a line getting to hot and cuasing fluid to not work ? when it happens all the rims are HOT! and the brake pedal cant be pushed in it is stuck out all the way. the booster is new and so are rear discs, any sugestions? to much vacum? line to close to motor??