Hope your brake issue gets fixed man. Here's my story.
It's like -30 below freezing outside on friday and my rear drum brake freezes up solid. Or so I think. So I take the other truck to work. Sunday I take it down to the father-in-laws shop. On the way there (about 13 miles) I am avoiding all traffic stops and/or attempting to hit every light. Cause every time I hit the brakes that rear drum locks up and I'm down the road sidways for a mile till the damn thing breaks loose. I get down to the shop thanking God for the arrival without a rear tire blowout. There happens to be anywhere from two to four inches of ice on all in town roads so that helped also. I take the wheel off and realize that I can't get the rear passenger drum off without a special puller tool. WTF!!! So I decide to take a space heater to the drum brake to see if that helps it break loose. After about five minutes under heat the rear drum breaks loose and I have been driving on it ever since. I don't know what the issue is? Ice/condensation build up in the drum? Loose, damaged or broken shoe? Bearings in axle frozen? I'm stumped. This issue happened last winter everytime it got below -30 degrees outside or if I take it into a garage to warm up then back outside. The weather has been above -20 most of the weekend, so I don't know if It'll happen again. I did bleed that rear drum when I was at the shop. Took off the bleeder valve and nothing came out. I pumped the brake and some fluid squirted out. I think I may have condensation build up or something in that damn drum? I'm taking it down next week after I get paid to have the rear drum pads replaced.
Oh, I lifted the rear end up and checked the axle for LSD? None! Damn it!!! Good luck with your brakes man.