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the MC piston is at its end point. Thanks for the tips. I will try those things tomorrow, starting with bleeding at the banjo bolt at the MC.

My question still remains. How do I discern between failing MC vs seized/corroded caliper piston.

Symptoms:
- brake lever doesn't build enough pressure to push piston out (though it can push...

My neighbor has a compressor -- might ask him if I can use it to push the piston out.

I'm also going to rebuild my rear MC first and see if that fixes the issue.

That is a brand new caliper assembly... I'm not trying to spend $90 when a few new seals and piston is <$20

St Paul HD doesn't have a rebuild kit for the rear caliper... Anybody know an equivalent part number for the Nissin assembly?

Nah -- I just pushed it back in. Now the pedal isn't pushing the piston back out.

I don't have a compressor or grease gun -- how else could I get it out?

Went to change my pads -- it took a lot of force to push the piston back in. More than what I think would be normal.

Upon reassembly, I added new fluid and bled the line for any air that might...