The brakes on our Buick seem to drag when we back out of the garage and the ABS light goes on. There is no problem first thing in the morning but if it runs and then goes back into the garage the problems appears. We live in Wisconsin and my husband thinks that it is caused by a build up of slush from the road and it is frozen on the brakes, but I am concerned since I have had a master cylinder go out on another Buick we had and I had no brakes while I was driving. A very scary ordeal. Any suggestions?