Poor adjustment refers to the clearance of the pad from the brake drum; in the case of the C-51 Chrysler Windsor, it is 0.006 inches. Six thousandths of an inch requires a particularly exacting tool to ensure that the heal and toe of the pads hit the brake drum equally. What is the heal and the toe of the brake pad?
The only effective way to illustrate is offering a page out of the 1951 Chrysler Shop Manual, page 56. (see below). The toe of the brake pad is closest to the wheel cylinder. The method for using the MT-19H tool requires repetition. First you adjust the toe then the heel and repeat. You can spend some time going back and forth between adjusting the heal and toe until the pad appears to be reasonably even and round.
Once you have the whole thing adjusted, it may still need final adjustment on the car. It becomes especially apparent when the brakes pull to one side or the other.
I had another particular problem with the adjusting cam - the bolt and pin turned but the cam did not. It was an interesting problem.
Someone had originally tack welded the cam to the pin, which worked fine until the weld broke. I tried the same technique but used epoxy to secure the pin to the cam. That worked like the tack weld. My most recent attempt included a torch and a hammer. There is no assurance that it'll work any better. However, I plan to replace the drum brakes with disc brakes soon. It is a large expense, but well worth the trouble if I plan to keep the car.
After twenty years, I plan to keep the car until I can't see the road anymore.
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