Finally have the 52 GMC driving around the neighborhood and trying to work out some bugs. Five-mile cruise on mountain roads, 35 mph max, probably hit the brakes 25 times for stops, steep hills, testing, etc. Truck stops well without pulling.
LF, RF, and LR drums are HOT to the touch upon return. New NAPA drums, shoes and wheel cylinders on all four wheels. Drums have been turned lightly to true them up. Dual master cylinder conversion, new brake lines and hoses. No pre-load on master cylinder and I don't think it's hanging up.
I spent quite a while with the wheels jacked up tinkering with the anchor point and tapping the backing plates to center the shoes and backing all four shoes off to the point where I don't hear any drum-to-shoe contact when spinning the wheels. I don't have all the adjusting screws identical- each is backed off to the point where the rubbing stops.
So, friends, is some heat to be expected during break-in of new shoes and drums? Will it quit in a hundred miles? Should I continue to tinker with shoe-to-drum adjustment? I'm reluctant to get on the highway at higher speeds until I figure this out. Thanks! Dave
