I need to replace my master cylinder 4 wheel abs, I've watched some video's on youtube and they bench bled the master cylinder before installation. Once it was installed, they had someone push the brake peddle and they cracked each line connected to the master cylinder to bleed the air. The car was then put back in service and the brakes worked fine. I've read elsewhere that when the master cylinder is changed, you need to have the dealer bleed the brakes. Can I do it like the youtube video and use my power bleeder to bleed the brakes at the caliper?
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The older abs systems needed to be active while bleeding the brakes - dealer function. The new systems in our impalas are pass thru and can be done at home. Yes you need to bench bleed the master and then install it. Then bleed all 4 wheels. Its not a bad idea to get all the old fluid out anyway.
There is an option in the EBCM to actuate the brake pressure modulator valve (BPMV) one caliper/corner at a time while doing a positive pressure bleed from the master cylinder but you have to have a Tech 2 to do it. As long as you don't disconnect the individual brake lines from the BPMV or introduce air into the BPMV I don't see the need to do it.
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A little off topic but something the same.. I had to replace all the steel brake lines from the EBCM back. I left all the bleeder valves open and gravity feed the fluid to each wheel, then started closing the bleeder valves when the fluid started to run out. Never had any problems.
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