Having an issue on one I just picked up, all four calipers are sticking and I can't figure it out. The buddy I bought it from said he was towing his boat and felt it struggling and parked it. I've collapsed the calipers by hand completely off the truck but they will not do it while on the truck. Rubber hoses seem to be good. Hydroboost is testing good. Is there something I'm missing? ABS pump possibly bad??
Stuck Brakes 05 tahoe z71
- Thread starter Wells596
- Start date
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Ok, first, welcome to the forum from Oregon.
Second: How do you know ALL FOUR calipers are sticking? Did you lift all 4 wheels/tires off the ground at the same time and all in neutral and you cannot spin the tires by hand? If they are all 4 bound up, then what controls all four at the same time, is something that is like riding around with your foot on the brake all the time. Get a helper. While in the air and engine off, pull the brake pedal up and then see if the wheels still bind. Then try the same with engine running. What are the results? If still binds, then loosen where the hydro-boost and master cylinder bolt together. Not completely unbolt, just loosen to where there is slight separation. do the binding wheels check again. What are the results?
Second: How do you know ALL FOUR calipers are sticking? Did you lift all 4 wheels/tires off the ground at the same time and all in neutral and you cannot spin the tires by hand? If they are all 4 bound up, then what controls all four at the same time, is something that is like riding around with your foot on the brake all the time. Get a helper. While in the air and engine off, pull the brake pedal up and then see if the wheels still bind. Then try the same with engine running. What are the results? If still binds, then loosen where the hydro-boost and master cylinder bolt together. Not completely unbolt, just loosen to where there is slight separation. do the binding wheels check again. What are the results?
When I drive around the neighbor hood and back to my house all four wheels are smoking at the calipers. I do believe I just figured it out. I pulled both abs module fuses and now the only affected wheels are the rear. Before I couldn't coast down the hill my house sits on now it'll coast to the end of my road about an 1/8th mile.
If it helps I do have three u1000 codes. One for powertrain, one for airbag and one for body control module.
Each specific code will have a diagnostic procedure to follow. The diagnostic process helps you keep from shooting the "parts cannon" at the problem.
I would guess that the codes set after you drove after pulling the fuses? Or were the codes there before pulling fuses?
Any concern you have on any problem you post here, NEEDS the concerns and the attempts made to address them, posted here in chronological order.
I would guess that the codes set after you drove after pulling the fuses? Or were the codes there before pulling fuses?
Any concern you have on any problem you post here, NEEDS the concerns and the attempts made to address them, posted here in chronological order.
So with my scanner the only thing it's telling me is u1000 indicates a comm error between system control modules and is often accompanied by other network related u codes. So with how I'm looking at that is the related modules to those specific items are bad. Correct way to look at it or no? I'm trying everything before I resort to just letting the parts cannon go full auto. lol
Again, did you get the code(s) after pulling fuses or before? Are you saying the only code you have is u1000 and it is repeated 3 times?
Another question, did the buddy or you do any, I mean any, work on the truck before this problem came up? Don't assume. Call the buddy and pin him down and find out.
He did do the passenger caliper. All I’ve done is put a set of rear pads on it and try to diagnose the brake issue. Bled them as I thought maybe they didn’t bleed all the air out. Other than that haven’t done anything.
Had the codes before pulling fuses.
