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Old 05-07-2019, 07:47 AM   #10
Alpha1BC

 
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Drives: 2017 1SS 1LE
Join Date: Jun 2016
Location: Detroit, MI
Posts: 1,000
Quote:
Originally Posted by mblum View Post
I have a guy that has one that I think I can rent. I had him do the process before but he rushed through it and I don't think it was properly done. I was inside the car pushing the brake pedal when he needed and I could hear/feel the ABS pump cycling.

If the ABS followed by a caliper bleed does not fix the issue I will have to do a Master Cylinder bench bleed, followed by another ABS bleed and then a caliper bleed to get all air out.

Is there a way to access the GM service manual? Just curious to the recommended bench bleed process.
There's a couple places to get the manual online, unfortunately not for free that I've seen though.

Recommended bench bleed process is to take the MC off the car and clamp the flange in a bench vice. Hook clear hoses up to the outports of the MC that route back into the reservoir. Fill the reservoir with fluid, then slowly push the plunger until you can't anymore (about 1"). Keep pumping fluid through like that until there are no more bubbles coming out. Then, remove the hoses and put the reservoir cap back on and re-install in the car. Also suggested to use a rag or something to wrap around the MC while installing to keep fluid from dribbling out of the ports and onto the car.
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