I just did the cobra brake upgrade to my 99GT (cobra calipers and 13" rotors) followed by bleeding. Now my parking brake idiot-light comes on during braking??? if I'm stopped and apply the brakes it doesn't come on, only during motion. what the heck is this about?
Possibly a little low on fluid. I'd check that first. You could still have some air in the lines. Did you bleed with a vacuum pump? You can get one at Autozone for about 25 bucks. Bleeds alot better than the foot on the brake method.