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  1. C

    Help with brakes before I pull my hair out

    Well I couldn't get any more air so I went for a drive and the brakes were fine BUT my initial problem of the brakes staying engaged after hard was still present. To be fair almost everything needed replaced anyway because the car sat with my father in law for 2-3 years with brake fluid that was...
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    Help with brakes before I pull my hair out

    Of course. What I mean is I prefer to use a kit with hoses so I can be sure no more air is circulating. I prefer this over the "plug ports and pump until air stops rising into reservoir" method since it never works for me. BUT, when I am done, I remove the hoses and install the provided plugs...
  3. C

    Help with brakes before I pull my hair out

    Yes, I am using a scan tool to do the autobleed sequence.
  4. C

    Help with brakes before I pull my hair out

    Basically the same as you but Orion bleeder. just your typically pump up pressure bleeder. I'd think it was impossible too but here we are.
  5. C

    Help with brakes before I pull my hair out

    What I meant was that I was pressure bleeding getting no air through so I went back to a revised manual bleed to get some air through finally.
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    Help with brakes before I pull my hair out

    Just a quick update: Over the weekend I received a replacement master cylinder and an ABS valve block. ABS valve block is put to the side but on hand in case I need it, can be returned for full refund. I bench bled the master cylinder perfectly until no compression (realistically just a teeny...
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    New hydroboost to master cylinder question

    It's all good. I used the rod from the original booster in the new one once I got them apart. Doesn't really matter because I have another thread open where the brakes are unbleedable after replacing the master for some reason. Got another ACDelco master cylinder bench bled and on the truck...
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    New hydroboost to master cylinder question

    And there's no adjustment so I'd have to remove the pushrod and trim.. maybe with this amount of preload they designed it to not cover the bypass port. Just seems odd since it's like 1.4mm preload. You have a gmt900 with hydroboost? If you ever get the time I'd love to know if you remove the 2...
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    New hydroboost to master cylinder question

    Hey everyone. Just wanted to report back that I finally used an air hammer to separate the original booster from the original master cylinder and they also have the same preload. Anyone here has experience with the hydroboost? I've only ever worked on vacuum boosters and this is a big no no but...
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    Help with brakes before I pull my hair out

    Haha I was the one with the gap. Unfortunately it is the right parts so idk why they didn't fit together neatly. It was ACDelco 18M2564 for the master cylinder and the booster is Bosch 0204777579. I ended up pulling out the rod on the booster and removing material until it was just .030 gapped...
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    Help with brakes before I pull my hair out

    Thanks. I used a pressure bleeder as well to no avail.
  12. C

    Help with brakes before I pull my hair out

    Thanks. This kind of affirms that something is wrong. I've replaced master cylinders and have redone entire brake systems many of times but never on ABS vehicles. I have this unfortunate hunch that the abs valving is leaking internally causing either trapped air or bypassing the pressure...
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    Help with brakes before I pull my hair out

    Yes
  14. C

    Help with brakes before I pull my hair out

    TLDR: I was having brakes sticking issues. After replacing everything I can't get a firm pedal. Wondering if ABS valve failure is common. I own a 2008 Suburban 2500. The brakes were dragging so I started going around all four corners replacing pads and rotors. I also replaced the rear calipers...
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    New hydroboost to master cylinder question

    Hi everyone! First post here, first GM vehicle, and first hydroboost vehicle. I have a 2008 Suburban 2500 that I haven't been able to drive much since purchasing because of brake lock up issues. Long story short, I'm at the point of replacing the hydroboost and master cylinder. I purchased a...
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