I have been having this issue in driver front side since Feb. 2010. I’ve had the ABS sensor and bearing in this wheel replaced twice; also all 4 wheels’ brake pads, rotors and caliphers replaced; parking brake replaced. My mechanic (not dealer) is master mechanic and has 3 other mechanics in a forum…

2004 Grand Prix - ABS/Traction Control Problem won't stop

knfenimore October 21, 2010, 5:16pm 5

Could be the rubber brake line is colapsing internally and keeping pressure on the caliper when the brakes are released. I would replace both.