Now I put the brake mount assembly back. This thing must have a real name, but I don't know it off the top of my head. It just holds all the brake stuff in place. It was hard to get this off, so I figured I should put it back on just as tightly. So I pounded the handle of the wrench with a mallet a little to snug up those bolts. If I had a torque wrench, I could put it back to the exact specs, but I don't, so I do my best. It's not falling off.
Under the hood is the master brake cylinder. You can see the fluid level is a little low. That's because all that fluid is down in the caliper piston that got extended so far when the brake pads wore down.

I use a clamp to squeeze the piston back into place.

And now look at the fluid level. It's higher. We had been getting an intermittent brake warning light when we went up and down hills, and I think that was caused by the low levels of fluid in master cylinder dipping below the sensor there. Now that the level is higher, I expect that light won't be coming on again.