Hey everyone, I have a 2003 bmw 530i (M package). I was driving the car about a week ago and as I was driving I noticed that the brake pedal progressively began to get more firm, I also noticed the car was slowing down without me touching the breaks. Gradually, the car came to a halt in the road when the breaks overpowered the throttle. (it appears as though it may be only one or both of the rear wheels) after coming to a stop, the: brake, ABS, and traction lights all came on the cluster. Unsure of what to do, I turned off the car and let it sit. after a few hours, went back to the car and it was completely fine (no lights). Today, (after about 200 miles or so) the car did the same thing. I did the same thing, (let the car sit) and it was perfectly fine. Does anyone have any idea what the problem could be? Getting kind of sketched out driving this car now.