Brakes dragging after driving

The Master Cylinder hasn't been replaced in a few years. And what you're saying makes sense about the heat thing. The first time it happened the right rear started to drag or lock up and by loosening the Master Cylinder bolts it worked to lessen the drag. Thinking it was the right rear caliper I replaced it and then tightened the Master Cylinder bolts again and it worked for a while and then it happened again, and I had to pull over. After loosening the Master Cylinder bolts again, I drove home. Question the Master Cylinder bolts are loose now, and the brakes work fine. Can I drive it this way until I replace the master cylinder? The Booster for this car is back ordered bigtime but Master Cylinder is available.

By the way. Owning this car for fifty years I do all the work on it myself.

Joe,

I rebuilt the front calipers a year or so ago and as I said before replaced the rear right caliper a month ago when it locked up. Yes of course the wheels heated up. The first time it happened it was in the right rear and this last time was front right. I felt all the wheels and the last time the front left was heated but the front right was really hot. It can't be a caliper problem. It's either Master Cylinder which I ordered because it's available and hope that is the cure. If not, I'm going to have to wait until the booster becomes available. My question is, is there a problem running it with the Master Cylinder bolts loosened in the meantime?

Joe, first let me say I am and have enjoyed this exchange. Thank you for that.
Secondly, I have access to a Classic Fiat 124 guru. Mark Allison at Allisonsautomotive. Com, who has been working on these classics for years now and is the go-to guy for these cars. Mark told me just now in his email response to adjust the booster pushrod which I'm going to do this weekend.
But to do that I have to disconnect the Master Cylinder from its line in order to get it out of the way, which will take some time. I play in golf games on Wednesday and Thursday and will drive it like it is and be very careful not to follow too close and keep my right hand free to grab the emergency brake if need to. LOL
I will let you know after I adjust the pushrod this weekend how that is going.
Again, thank you for the exchange.
P.S. My other daily driver is a 36-Ford truck that I have a 292 cu in Yblock in and is in the middle of brain surgery. Blown head gasket and number 8 piston blew the rings off and came partially apart. (Probably detonation) The ring and piston pieces were in the oil pan and when I popped this piston the cylinder wall was remarkedly unscathed (smooth as a baby's butt) so luckily, I think I'll get away with honing it and dropping a new piston in it. The problem is finding a single piston set of rings, so I don't have to cough up several hundreds of dollars buying a whole set.
I also have two Ford 9N tractors that I love and use regularly.
Lastly friends of mine who know me well just say it's another RonTron when one of my rigs goes south. There is always some strange thing that happens to RonTron cars and tractors, LOL.

Joe, just thought I would give you an update.
I put spacers between the booster and the Master Cylinder and haven't had any issues in the last couple of weeks. The spacers are only a couple bolt washers thick. Doesn't take much apparently to take the load of the Booster. I'll let you know if things change.

Joe. Have no idea about why the booster plunger suddenly got longer but the spacers are still working. By the by go to YouTube and search Ron Troncatty. I’m an actor who can’t get arrested anymore but worked a lot in my younger days.