I have a 70 with 10" manual drum brakes. I have found severe corrosion in my wheel cylinders and lines. I am replacing all the cyliders and the lines. What i am wanting to know is what is involved in rebuilding the distibution block? Is this just passages and ports to the switch or is there more in the block?

 

It's a solid brass block with a solid brass shuttle pin inside. About the only thing that can go wrong is the seals on the pin, which is unusual even when this old. Well, you could strip the threads, or hammer it to junk, I suppose.