I put on new calipers, then attempted to bleed the brakes. After spending hours with my kid working the pedal, I still had spongy brakes. Starting at furthest brake and working forward.
Then I bought a Mityvac hand pump bleeder and tried with it. This time I started at the closest brake to the master cylinder and worked backwards. The instructions with the vacuum said to go this way, and I read somewhere that this is proper if your chasing an air bubble. I dunno.
Anyway, at the front left brake, I would create vacuum pressure, and open the bleed nipple. Some fluid would come out, but pressure drops immediately. I could get more fluid to come if I kept pumping the vacuum, but I don't think this is what you have to do.
Moving on to the front right, the pressure would hold, even with the nipple open, and fluid would flow continuously. This seems normal and good.
Back left I need a new nipple so I can't test it. Somehow I stripped it since yesterday.
Back right, same deal as front left, pressure would not hold.
The fluid reservoir stays full after a day of driving, and I don't see leaks anywhere. Could lines be bad? Master cylinder bad?