I’m having an issue with one rear brake on the drivers side that just started, seems to occur if the car is left alone for more than 24 hours without driving it. I will start the car and as it moves forward a few feet suddenly the one rear wheel locks up. Oddly if I put the car in reverse and step on the brakes it unlocks and I can back up fine, going forward it may do it again, and using this forward/reverse rocking motion it usually gives and after I leave the driveway no problem. I’m afraid of it suddenly seizing up on the highway which could be catastrophic. After it rains it seems worse and yes there is a good deal of rust beneath the vehicle. My mechanic seems to think it’s the brake shoe separating, but it does’t make sense, he wants to replace both rear brakes but that’s more money than I can spend now given the current economic situation especially since I’m not sure that’s the issue. The first time it happened I had it towed and the operator released the lock up with the emergency brake and said it was probably just due to rust. I’ve never used the emergency brake for any reason and I will be the first to admit I’m not savvy at all when it comes to cars. I have tried to research it some and have read that sometimes this kind of thing happens from non use of the emergency brake, that it can seize up? From only one side though? I appreciate any kind of help or suggestions from anyone who may know what’s going on before I pay for an expensive and possibly unnecessary repair?