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Can't bleed air out of brakes - 2008 Silverado...help!!

This is a discussion on Can't bleed air out of brakes - 2008 Silverado...help!! within the Technical / Maintenance forums, part of the General Discussion category; I don't know what the problem is but we tried to bleed the brakes after changing to stainless steel brake ...

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    Can't bleed air out of brakes - 2008 Silverado...help!!


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    I don't know what the problem is but we tried to bleed the brakes after changing to stainless steel brake lines...it's a 2008 2wd silverado. We bled the rear with no problems, but now the front is giving us all sorts of trouble. When we drive it, only the rear brakes work. When we bleed the front, the pedal never gets stiff and nothing but 80% air/20% fluid come out of the bleeder.

    Do you guys have any ideas?
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    Torque Engineer SoCalZ28's Avatar
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    Did you do any brake work at the same time? Also, if you used thread tape, maybe a clog.
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    Home of the Snooki punch! CKTA's Avatar
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    By any chance, did you let the resovour get really low on fluid? If so, you may have air in the ABS?
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    Registered User GCncsuHD's Avatar
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    Quote Originally Posted by CKTA View Post
    By any chance, did you let the resovour get really low on fluid? If so, you may have air in the ABS?
    if you don't keep it topped off while bleeding and this happens, the ABS must be electronically bled by the dealer or someone with a Tech2.
    Last edited by GCncsuHD; 10-13-2009 at 05:41 AM.

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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    Quote Originally Posted by GCncsuHD View Post
    if you don't keep it topped off while bleeding and this happens, the ABS must be electronically bled by the dealer or someone with a Tech2.
    We kept the reservoir full...but we know that air got into the ABS. We cracked open the line going at the ABS unit to the front left caliper and it was full of air.

    Is there any other way to bled the ABS unit ourselves?? I'm pissed because we've bled tons of brake systems and this is the first time we've ever had an issue - and I'm positive the reservoir stayed full.
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    G-FORCE FinalBreath's Avatar
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    If you kept the res full, How did air get into the abs unit?
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    Quote Originally Posted by FinalBreath View Post
    If you kept the res full, How did air get into the abs unit?
    That's what I'm trying to figure out...it doesn't add up at all.
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    G-FORCE FinalBreath's Avatar
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    Leave the cap off the res full of fluid and open the bleeders. Let it gravity bleed for a while. Keep watching the res and keep it full. That should get most of the air out.
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    Quote Originally Posted by FinalBreath View Post
    Leave the cap off the res full of fluid and open the bleeders. Let it gravity bleed for a while. Keep watching the res and keep it full. That should get most of the air out.
    I'll give this a shot and see what happens.
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    Home of the Snooki punch! CKTA's Avatar
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    That won't work as far as I know. To get air out of the ABS the dealer or Tech II has to do it.
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    Re: Can't bleed air out of brakes - 2008 Silverado...help!!

    I wish I knew someone with a Tech II...
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