2001 pontiac grand am se

[roodatoot]

brake system? Replaced brake pads and calipers. Bleed brake system completely. When engine is off the brake pedel has pressure and is firm. When engine is running brakes go to floor, no brakes. Is there anything computer related? Also with no brakes the ABS light is not even on.

 

[Ric]

does the pedal go down slowly? if so it maybe be an internal leak in the master cylinder.

 

[wde3477]

Offhand, don't think it's computer-related. If the pedal was fine before, suggest the system has not been bled properly. Doesn't take a lot of air in the lines to make the pedal go to the floor.