So I'm in the process of working on the brake system for my 70 Chally "restore". It has been sitting for several years and has been sandblasted, and painted and is ready to put back to together. I remove the left right drum. Full of sand, rust and cobwebs. I decide to replace all hardware and the cylinder that is full of rust. I remove the right rear NO PARTS. O.K. no problem. I was going to replace all anyways. I move to the fronts. Left front NO PARTS. Same thing. Just replace all including wheel cylinder. I then move to the right front. All new parts and a newer looking cylinder. I decide to leave that one alone, then I realize the hardware is all wrong. Cable in wrong direction. Springs attached wrong etc. I decide to redo and then I take a better look at the cylinder. On second thought I will replace that one too so all are new. I go to pull it, but they bolts were replaced with slotted screw bolts! I cant't remove it unless I remove the entire backing plate, which I do. This is what I found after I removed the cylinder!
I found rust in the other cylinders but this is full of sand, rust and old brake fluid. I am glad I replaced ALL lines with stainless, and braided, all brake parts and cylinders, including a rebuilt master. Now I know why the previous owner cut all the brake lines. He didn't want anybody to try wo use any of the parts on the car.
Now for the next development. After removing the plate I inspect the bearings. RUST! Practically no grease and very rough. Now I am going to replace all bearings, races and seales. Man this is turning out to be a big job!