Update - done and done. Perfect working brakes now.

Had to break down and purchase a rear caliper for my 1988 300SEL today. Removed the hose and the caliper was still sticking, so we assumed the caliper was bad. Within 2000 miles it had already eaten up the new brake pads we had installed! We already had the new hose, so went ahead and installed it as well.

This evening me and my dad tried bleeding the brakes, starting at that wheel (right rear), but the pedal will not pump up at all. Also when the screw is turned, nothing will come out but air. No fluid at all. We tried it about 30 times. Reservior is staying full too. No fluid coming out. I dont think the master cylinder is bad, because the brakes were working fine before, other than that RR sticking some. We had just decided to replace that hose, as someone said the hose may have swelled up, but even when removed, it was still sticking.

Anyone know what is going on? Is there a special way to bleed brakes on a W126? We have never done brakes on a W126 (other than new pads before), so we are clueless as to what is going on.

Thanks for any information!