65 impala drum brakes dragging
I've got a problem with my 65 impala, with all new original replacement brake parts, after driving around for 5-10 miles my front brakes start to stick and hold pressure in the brake lines we've installed new master cyl., brake lines and rubber hoses, all wheel cylinders, brake booster and all springs, self adjusters, and start adjusters, the only thing we didn't change is the distribution block, I've been told there is a residual valve in there can someone tell me how to replace it, do I just order a distribution block? or can I replace just the residual valve? and where would I purchase one.
Please help as the car is almost a hundred miles from home at this time, and we are minutes from finishing the full 2 year restoration.