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05 Denali XL
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Discussion Starter · #1 ·
I'm trying my hardest to keep this old girl on the road.. lost a front brake line a few weeks ago, got a set of nicop lines. Replaced the leaky ones, yay, no more leak. Bled the system 3 times today, while off the pedal is pretty firm, start the truck up, no pedal at all, am I looking at a hydroboost issue? Master cylinder? I'm generally pretty patient but I'm so frustrated with this thing.
 

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Sounds like you still have air in the system. You may need to do a pressure brake bleed. There are a ton of videos about this on you tube, here is just one of them.
 

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The ABS causes a lot of bleeding problems.
Pull the ABS fuse and use a vacuum bleeder
 

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05 Denali XL
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Discussion Starter · #4 · (Edited)
Got a pneumatic bleeder, seems I should have gotten a pressure bleeder instead. It just pulls and pulls on the right rear. Held it on the bleeder for a solid 4-5 minutes and after the first little trickle nothing, not a drop of brake fluid. I got some fluid from the fronts. Not losing any fluid anywhere and can't seem to find any leaks. Getting close to giving up on it.
 
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