So, the other day I heard a grinding noise from rear driver tire and put it onto my to do list looking into it the next weekend. Well a few days later that same tire fully locked after hitting the brakes. I didn't go a check on the pads when I bought it a few months back and didn't realize they were GONE. The caliper had fully extended and partially popped out. Effectively binding the caliper piston to the rotor. I replaced the rotor, caliper and pads. Since it took me 48 hours to get parts in, and in that time the entire brake master cylinder was empty. l and have been using my HF pneumatic brake bleeder that I've used on dozens of other projects. I have bled out about 3 quarts of fluid and still don't feel I'm getting anywhere. Any advice?