check your brake lines and parking brake
 

I had my passenger side line blow coming into the garage and found out my parking brake barely worked. Almost ran into my Xfire. I was very lucky, cause I have a steep driveway and if it had went out coming down the hill it would have been bad news. I ordered in two lines to replace both sides and sure enough the drivers sided had been rubbing on the spring and was about to blow too. I also adjusted the rear parking brake shoes and they are fine now, just incase something like this happens again.