When I received my M1028 the rear brakes were grabbing bad, so I pulled the rear drums to inspect. The drums and shoes looked like the surface of the moon, and my mechanic determined that the drums were too severly de-faced to be turned. The cost of new drums, shoes, and the other items was over $700, so I began thinking about replacing those drums with Disc Brakes. I found exactly what I needed at TSM Manufacturing in Castle Rock, CO.
TSM MFG. CO., INC. Special brackets, rotors, brake lines, and rebuilt calipers from a 1977 Cadillac El Dorado with emergency brakes. The whole outfit came in a little south of $700 and fit like a glove. Now, the truck will stop on a dime going forward or backward, even after being underwater. The TSM kit includes everything necessary including flexible SS lines to compensate for the caliper movement. Have a look -