Bleeder screw on the ABS module?

ALAN POSEY

MEMBER
2004 PONTIAC GRAND PRIX
3.8L
V6
TURBO
105,000 MILES

I am finished with head gasket and replacing radiator, car is running great now, but previously I had replaced all four brake calipers, and had bled all four calipers and got all fluid and no air and I assumed I had brakes so I pursued replacing head gaskets and radiator. Now the car is back running I realized I don't have brakes. I have been reading that there is a bleeder screw on the ABS module but I can't find one anywhere. How do I need to bleed the brakes on this car?

1 Reply

STEVE W.

MECHANIC
13,003 POSTS

As you replaced all the parts it's likely that you got air into the ABS module. You bled the hydraulic section but the ABS module does not have a manual bleed option, to bleed it properly you need to connect up a scan tool that can activate the ABS auto bleed function. That purges air out of the ABS module. Then you do a manual bleed while the solenoids and valves are cycling. There are a few lower cost scan tools that can run the bleed option, and some parts stores have them as "loaner" tools as well but on the cars of that year there is no manual option. Here is a video and guide below to help you bleed the brake system correctly.

https://youtu.be/w7gUsj2us0U

and

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

and

https://youtu.be/WDxvEQrMkBg

Please run down these guides and report back.