1984 SL500 brake question
 

I have a 1984 MB 500SL, it is the 1st 500SL. It is at my dad's in Vegas and is barely driven. Brought it in for a brake job 2 years ago and put 250 miles on it since. The front right brake is binding, while driving the car pulls to one side and the same on braking.

When jacked up I can barely turn the wheel, I take the wheel off and cannot turn the rotor. I open the bleeder screw and it turns, I bleed it, close the screw drive the car and the same problem. OK I figure bad caliper so I put a new on on. Same problem, any suggesstions?

If the rotor was free while the caliper was removed, and you replaced the caliper with a new/rebuilt part the only thing remaining is that there is still hydraulic pressure on the caliper.

I'm going to presume you haven't swapped the wheel with one of the incorrect offset that doesn't clear the caliper. (I did that once and wondered why the wheel wouldn't turn...)

The most common thing that retains pressure on the caliper is a defective rubber brake hose. These rupture internally and pinch off the inside of the line. Depending on the rupture, it can HOLD pressure on the caliper, or BLOCK pressure from the caliper.

I presume that opening the bleeder valve on the caliper releases the pressure?

There is nothing related to the master cylinder that could do this to only one wheel...

Thank you I didn't think about the rubber brake line, that could very well be it since I haven't swapped rims.

Its probably the rubber brake lines, they are cheap I'd replace all 4.