Rear adjusters turn clockwise on both sides.  If they do not allow satisfactory adjustment you may need new shoes (too thin/worn), drums are worn beyond limits, or you need new wedges.

There, now quit complainin'.  Or, we're coming for ya!

I installed the drum with a built in 1" spacers and problem solved. The issue I have now is that I can not move the square nut to calibrate the brakes, It stopped already and I need it more tight. 

swing arm bushing. when I bought mine 4 years ago I noticed that the shock bolt on the drivers side was really close to the sub frame. it had in fact hit and bent the sub frame to allow it to clear. I changed the swing arm bushing. this year when adding hilo's to the rear I noticed the swing arm was again "loose" . turns out that the hole in the subframe had become oval. welded a washer in place and presto straight and away from the subframe! and yes looking for a subframe for next years rebuild.

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If everything's under control, you are going too slow! -Mario Andretti

I had a similar problem with mine and found that after changing out the training arm bushings and shafts, the problem went away.

Do the checks that mur suggests and let us know what you find.

I had one rear wheel rubbing on the inside too. I changed the swing arm on that side thinkng it might have been bent due to a previous owner hitting the curb hard (apparently bent swing arms are not an uncommon problem). However it turned out to be a bent subframe. I replaced the subframe and now everything lines up nicely.

A drum with a built in spacer looks like this:

artno=BRAKE%20DRUM%20MINI%20COOPER%20S%20REAR%20MINI%201%22%20WIDER%20THAN%20STOCK">

One inch of spacing integral, or commonly known as "S" rear drums. Your shoes will be 1-1/4"

Terry 

If you're not on the edge............ you're taking up to much space.

I just bought the mini with new wheels and the tires (sorry for not being more detailed). The car has a 1/4 spacer and the tires rubs against the rear trailing arms. I just measured the brake drum and it is 2 1/2 inch wide. What kind of spacer can I put? or what kind of brake drum with spaces? by the way do you know what kind of shoes has my drums if they are 2 1/2 inch wide?

 Thank you, - Pablo. 

12 inch wheels would have been rare on a 1973 mini.  Perhaps your car is actually newer than that.  In any case, your problem could be the type of wheel and tire do not fit the brake drum and spacer or lack thereof that your car may have; or you could have a bent trailing arm; or worn trailing arm bushes.  Don't discount having all three issues at one time either.

Jack the car up.  Check for play in the wheel bearing and suspension.  Remove the wheel and discover what brake drum you have, if it has a built in spacer or not, or if there has been a spacer added.  This will be a good start.

Ad a spacers and longer studs. (or spacered drums)
or
Put the original 10" wheels back on with 145's, and enjoy the feel.

A FATHER CARRIES PICTURES WHERE HIS MONEY USED TO BE 

1130cc, 12g295, SW5 cam, LCB, HIF38, CA spec.