I have an 06 Lucerne with a brake line that rotted out and it’s been replaced. It’s been bled and the pedal will not firm up. I’m confident air is trapped in the ABS module. I used to be able to just plug a pressure bleeder onto the master cylinder and do a scan tool ABS bleed sequence when I ran into this. Prior to this, I can’t recall ever needing to do a pressure/scan tool bleed on a GM with only one hydraulic circuit broke open. But, this car is acting like two or more circuits have air in them and I no longer have access to a pressure bleeder with my current shop. I have a GM Tech II, a Snap On Solus, and an Autel Maxisys at my disposal for the automated sequence, but is there a way I can get around this lack of a pressure bleeder?
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