Go Back   Tahoe Forum - Chevy Tahoe Forum > 2000 - 2006 Chevrolet Tahoe / GMC Yukon / Cadillac Escalade Year Models > Technical Discussions

Welcome to the Tahoe Forum - Chevy Tahoe Forum.
Register to remove these ads.


Technical Discussions This forum is for technical discussions related to customizing your Tahoe/Yukon



Reply
 
Thread Tools Display Modes
Old 09-21-2007, 01:41 AM   #1
Whipple1
Full Access Member
 
Whipple1's Avatar
 
Join Date: Apr 2007
Posts: 118
Whipple1 is on a distinguished road
Default Brake Bleeding?


Register to remove these ads. It's free!
Was wondering if our trucks need a scan tool to bleed the brakes properly,it supposed to reset the abs accuator through a cycle then you can bleed,not sure if this is true:confused2: .Ever since I installed my brakes I have an inconsistant brake pedal,when I start it or when I drive around town it feels fine,but when I drive on the parkway wait for a couple of min. depress the pedal it travels twice the distance it should then 1 or two pumps its back to normal,its really unpredictable but it always happens somtimes its high somtimes low,I will try the motive power bleeder next if I dont have to cycle the accuator for the abs.Anyone with info would be great.Thanks
Whipple1 is offline   Reply With Quote
Old 09-21-2007, 02:07 AM   #2
JKmotorsports
tahoeyukonforum.com
 
JKmotorsports's Avatar
 
Join Date: Jul 2007
Location: ATX
Age: 40
Posts: 2,661
JKmotorsports is on a distinguished road
Default

There is an automated bleed procedure that uses the scan tool.
If you do not have the JL4 option (Vehicle Stability Enhancement System), then you have to re-initialize the abs system with the scan tool after the automated bleed procedure.
If you DO have the JL4 option, I don't believe you need to perform abs initialization.
But if you have no abs lights illuminated, I would double check to make sure you don't have any trapped air in the system before you move on. You can still manually bleed the base hydraulic system like normal before performing the automated bleed and abs initialization with the scan tool.

Last edited by JKmotorsports; 09-21-2007 at 03:41 AM.
JKmotorsports is offline   Reply With Quote
Old 09-21-2007, 04:14 AM   #3
unlukky
Tahoeforum Apprentice Member
 
Join Date: Aug 2007
Posts: 34
unlukky is on a distinguished road
Default

And remember to start with the furthest wheel from the master cylinder and work your way to the closest.
ie: RR, LR, RF, LF.
Good luck.
unlukky is offline   Reply With Quote
Old 09-21-2007, 06:08 PM   #4
Whipple1
Full Access Member
 
Whipple1's Avatar
 
Join Date: Apr 2007
Posts: 118
Whipple1 is on a distinguished road
Default

Quote:
Originally Posted by JKmotorsports View Post
There is an automated bleed procedure that uses the scan tool.
If you do not have the JL4 option (Vehicle Stability Enhancement System), then you have to re-initialize the abs system with the scan tool after the automated bleed procedure.
I do not have stability control,so your saying that I should have to re-initialize the abs system?Im not sure because I called the dealer and they said they dont do that,but that doesnt mean there right,Im still thinking there is air in the lines,I will get a power bleeder and try that.Hey JK unless you have some source thats 100% sure then I will take it somewhere thats familiar with that procedure,Thanks for the help guys.:yesnod:
Whipple1 is offline   Reply With Quote
Old 09-21-2007, 11:46 PM   #5
JKmotorsports
tahoeyukonforum.com
 
JKmotorsports's Avatar
 
Join Date: Jul 2007
Location: ATX
Age: 40
Posts: 2,661
JKmotorsports is on a distinguished road
Default

Quote:
Originally Posted by Whipple1 View Post
I do not have stability control,so your saying that I should have to re-initialize the abs system?Im not sure because I called the dealer and they said they dont do that,but that doesnt mean there right,Im still thinking there is air in the lines,I will get a power bleeder and try that.Hey JK unless you have some source thats 100% sure then I will take it somewhere thats familiar with that procedure,Thanks for the help guys.:yesnod:
I would say you have air trapped in the system still somewhere from what it sounds like. The abs system wouldn't cause what you are describing (at least I wouldn't think so from my experience). GM tech service and repair procedure guide states the ABS re-initialization is only done if you perform the automated bleed with the scan tool. Manual bleeding of the system doesn't require this.
JKmotorsports is offline   Reply With Quote
Old 10-26-2007, 12:13 AM   #6
Whipple1
Full Access Member
 
Whipple1's Avatar
 
Join Date: Apr 2007
Posts: 118
Whipple1 is on a distinguished road
Default

Well I finally figured out what the cause of the low brake pedal is after installing the Brembo brakes,It wasnt air,the master cylinder or the brake booster, it turned out to be excessive end play in my rear end shafts,it turns out that our posi units in our rears are beyond garbage a time bomb waiting to explode,so what happens is with the rear caliper off I can move my rear axle in and out at least 1/4 of an inch on both sides due to a worn posi unit,You cant feel this play when everything is assembled,So due to a fixed caliper the back and forth play is causing my rotors to compress my caliper pistons inward around turns and swervy driving is when I would get a low Pedal,just like you get when you do a new brake job you have pump the pedal to ceat the pads back to the rotor.Im getting the rear rebuilt completly but with a eaton posi to bullit proof the rear,I know a guy by me thats been building rears for 40 years.So anyone doing brakes check the end play in the shafts there should be very little play,Note: Floating calipers absorb this play dramaticly aposed to fixed calipers,but this is also what can cause a low pedal on our trucks and it is commom.
Whipple1 is offline   Reply With Quote
Old 10-26-2007, 11:39 AM   #7
JKmotorsports
tahoeyukonforum.com
 
JKmotorsports's Avatar
 
Join Date: Jul 2007
Location: ATX
Age: 40
Posts: 2,661
JKmotorsports is on a distinguished road
Default

Whipple, makes complete sense now. Not something you would normally look for during a low/spongy pedal diagnosis. Thanks for the useful info. I'm going to check mine when I change my brakes here in the next couple days.
Btw, good to see you around again.
JKmotorsports is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



 
Advertisement

Other Sponsors






All times are GMT -4. The time now is 04:44 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All rights reserved and copyrighted
Fully Driven Auto Network
GM Truck Forum
Ford Raptor Forum
Dodge Ram Forum
Chevy Cobalt Forum
Chevy Camaro Forum
FJ Cruiser Forum
Ford Truck Forum
88-98 GM Truck Forum
73-87 Gm Truck Forum
Ford Expedition Forum
Chevy Equinox Forum
Chevy Cruze Forum
Jeep Liberty Forum
Jeep Forum
Dodge Ram SRT10 Forum
Chrysler 200 Forum
Scion xD Forum
Scion xB Forum
Dodge Challenger Forum
SRT Forum
Nissan Titan Forum
Buick Enclave Forum
Cadillac Forum
Cadillac XTS Forum
TRD Forum
Central US Mopars
Southeast Mopars
Cadillac CTS Forum
Oklahoma Dodge Ram Club
Softball Forum