This is a very wierd issue and I have almost diagnosed it? The car will drive normally, then in it will start to gain drag until it basically will not even move. It usually takes about 10 minutes for this to start happening. Sometimes you will begin to feel the drag and then it will just randomly stop dragging and drive normally. When it happens, the brakes will feel really hard. I felt it had to do with the brake booster, so I removed the vacuum that was going to the brake booster and continued driving which solved the problem for a bit, but as I kept driving the problem started again. This is a really wierd issue I had it diagnosed at the shop, all they did was a brake flush and it didn't solve the problem. Please help me out with this one

 

Oh yea, the car is a 92 RHD FD