So newbie mechanic here, my brother-in-law gave me his 97 grand prix. He drove it hard. When he gave it to me he said don't use the parking brake....so naturally I wanted to see what he meant. So when I used it, the abs light came on and it just started acting like brakes without abs. Then shortly after, I fired it up and it was gone and the abs worked fine. Still does it every time I use the parking brake though. Any ideas what the heck is going on?