I'm working on the brakes of a recently purchased 1978 Mercury Monarch.
I've never worked on floating caliper disk brakes of this vintage. My experience has been on more recent cars or on the old 2 piston fixed calipers like those used by 1960's/70's Mercedes, Avantis and Ramblers.
On my Monarch the brakes were badly neglected putting 1/4" scores into the left front rotor. It should be replaced. It looks like the rotor and hub are all one casting with the lug bolts pressed in. Are replacements available as an assembly with lug bolts fitted or will some machine shop work with a press be required? None of my local parts houses have the rotor in stock - it has to be special ordered and I'd like to know what to expect.
Also, I'm not sure if the sliding surfaces of the floating caliper should be lubricated. The two sections seem to just grind across each other versus the modern floating calipers that glide on lubricated pins. Is some lubrication used with this old style?
There also seems to be a flat wear bushing set into place on the side of the caliper with a hex head screw. The plate can be slid back and forth, then it's locked into place with the hex head screw. What's this about?
tnx,
Doug