I have the same brake dragging problem. Just started last week, other wise brakes work fine. I saw "mrfixit" reply to replace the brake springs with stronger ones. Where to get those? Also where is a good place online to get other parts for it. C25C ?
I tried other suggestion to losen the brake bleeder, no fluid came out. So I would also agree with that post the it should be mechanical within the brake wheel area.

I'm pretty sure if you take the relief valve out you wont have any brakes at all. That is a 85 psi relief valve to keep the shoes out close to the drums so that you have a good pedal.
1. The relief valve could be clogged up.
2. Pedal linkage adjustment. Set the pedal so that you have to slightly push down on the valve spool to get the clevis pin in the clevis. This keeps pressure in the system from pushing up on the valve spool when you are not applying the brakes.
3. As was mentioned above, since the relief valve applies 85 psi to the wheel cylinders the condition of the brake shoe return springs is very important. The springs keep the 85 psi from moving the shoes out to contact the drum.

This is a tough brake system to troubleshoot... Good Luck!

took auto adjusters out e brake is loose...
we did try adjusting the rod from the slave to the pedal does make a difference but cant get a nodrag spot...
dont think springs will do it....depending on the a fore mentioned linkage... it wont move without stuffing the gas pedal... some one suggested a relief valve after the slave cylinder... remove it...
going try that

If adjusting the master cyl linkage back didn't solve it then there are 2 other possibilities
- the parking brake adjustment
- the shoe adjustment in the hubs

Parking brake can cause a drag if it is set too tight
And of course if the wheel adjusters are malfunctioning they might tighten up too much and cause a drag.

I worked on one of them once that had that problem even after a new master cylinder/valve was put on and it still dragged. There is a slight pressure in the lines going to the wheel cylinders all the time. I installed stronger springs on the brake shoes and that solved it.

ty 4 the reply
this doesnt tell me if its brake master cylinder problem or hydraulic slave cylinder problem , from what i gather the return from the power steering runs the slave cylinder for the brakes.... sounds silly... best comment i found on the net was "that system sucked BEFORE it was on the drawing board"

First thing to try is cracking a bleeder with no pedal pressure. If pressure comes out then it's a hydraulic issue. If no pressure then it's a mechanical issue in the brakes.

looks like the brakes are hydraulic right ff the hydraulics tried adjusting the link from the pedal to the valve to no avail please help