New Brakes

[JoeNest]

Hi everyone. I'm kinda stuck a wee bit here. 04 Grand Prix n/a, ABS. I had to put new brake lines from the ABS module to the back calipers, and replaced the calipers, hoses, pads and rotors on all 4 corners (thank you NYS rust). I have bled the system, and when the car is off, two pumps on the pedal and its hard as a rock, but when its running, the pedal goes to the floor. I again tried bleeding the brakes with the car running, but still do not have the pedal. Question, does the ABS mod and or the master cylinder have a separate bleeding procedure? The mc lines were not disconnected from the ABS. Any ideas would be great, thank you.

[Scottydoggs]

if your master ran dry at any point during the brake line replacements you need to bleed the master, then bleed the calipers again.

you can bleed the master on the car, crack a line free, then wrap a rag over the wrench and line nut, then have someone pump the brakes like you were doing a caliper, hold the pedal and crack the line nut, you'll hear air come out, repeat till its just fluid. then do the other line.

[JoeNest]

I originally broke a brake line while driving it home, so I will bleed the master, very possible that happened. Thank you, will bleed it tomorrow.

[JoeNest]

That didn't do the trick, pedal still very soft and goes to the floor. Talked to a few mechanics and they said that you have to hook up a scan tool and there is a procedure to go through to bleed the ABS out. Taking it to a garage tomorrow.

[JoeNest]

In case anyone runs into this problem, had the garage do the bleed procedure and the car stops on a dime now