Question about GMC Yukon

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1995 gmc yukon 2 door 4x4 5.7 gas ABS system light on and abs module will not bleed. suspect air bubble in abs . brake pros can not cure it and guess at replacing abs unit. breaks are a bit spungy. original problem; blew a brake line at rear. Repalced and bleed. now abs system light stuck. special tool for abs bleeded produces no bleed.

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  • mark loving Jul 27, 2009

    yes yes yes....how do i un stick the port and not damage the seal. I can force a small ice pick lick tool in there and......who knows if it will spring back in place??? any ideas

  • mark loving Jul 28, 2009

    Fantastic idea!!

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  • Master
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 You may start at the master cylinder bleeders just take them loose let gravity work here. Then do the pump and hold as you would in your Grandma's car (you need a helper) Try this with the engine switch on, or have the engine running. While you bleed the brakes, start at right rear wheel, move left rear, then right front, last left front. Just make sure the stitch is on and you may have to start it up and pump and press hard before you break the bleaders. Try this before you replace the unit. 

Posted on Jul 28, 2009

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  • GMC Master
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What is the ABS trouble code? sounds like if the tool doesn't work there is a sticky popit valve in the hydraulic control valve.

Posted on Jul 27, 2009

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1 Answer

ABS light and traction light and no cruise control


how on earth would the blind know what is wrong.?
scan it? yet?
btw, newer cars cut cruise feature for any signs of danger.
new laws...
the traction needs ABS to work ,so forget that and fix ABS.
ABS needs 2 things to work , brakes and ABS.

so if brakes are bad, then ABS will get upset.
after all, if it cant brake right, how can the puter save you?
if brakes are known to be ok (inspections work here)
but in this case it was BREACHED by you, with out reading the book first.
then scan the ABS. (omg? code for dead sensor?) nah, you caused it..
easy

ABS resets every key on. so...
my guess, if ABS was happy before your actions( you never said)
then you got air in to the system. and failed to follow the FSM instructions on bleeding brakes, in ABS car.

front caliper, did you block the hose with cap, so it didn't allow air to the modulator? oops... never just let them drip... or . max pain.
bleed it again, (using any or all 5 ways to do so, bleeding is skill thing) (many modulators can not just be simply bled)

now Ill quote the 2012 fSM for you , under brakes

Data: -----------------------------------------------------------------
ABS Brake Bleeding
STANDARD PROCEDURE - ABS BRAKE BLEEDING

ABS system bleeding requires conventional bleeding methods plus use of a scan tool. The procedure involves performing a base brake bleeding, followed by use of the scan tool to cycle and bleed the HCU pump and solenoids. A second base brake bleeding procedure is then required to remove any air remaining in the system.

Perform base brake bleeding, (Refer to Brakes - Standard Procedure)(Refer To List 1).

Connect scan tool to the Data Link Connector.

Select ANTILOCK BRAKES, followed by MISCELLANEOUS, then ABS BRAKES. Follow the instructions displayed. When scan tool displays TEST COMPLETE, disconnect scan tool and proceed.

Perform base brake bleeding a second time, (Refer to Brakes - Standard Procedure)(Refer To List 1).

Top off master cylinder fluid level and verify proper brake operation before moving vehicle.

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1 Answer

Replaced ABS modulator valve, unable to bleed brakes. What can I do?


Need special tool (electronic) But before that read this:http://www.stoptech.com/technical-support/technical-white-papers/bleeding-abs-brake-systems.

Oct 24, 2013 | 2001 GMC Yukon XL

2 Answers

My brother's sprayed engine cleaner on my 2003 Yukon XL and then washed it off with a water hose. 30 minutes later while driving my ABS plue Parking Brake lights came on with a message saying Check Brake...


C0550 is the code for the ABS module. It is on the frame under the vehicle around the drivers door area. It is a module with all the brake lines coming from it. Reset the trouble codes and see if the problem returns. If it does, the module is not serviceable and will need to be replaced.

Mar 24, 2011 | 2003 GMC Yukon XL

1 Answer

Abs light on after replacement of pads.fluid bled off while compressing pistons.


it sounds to me like the brakes ned to be bleed, there should be a bleeder valve on the back side of the brake hub, its usually a 3/8 or 5/16 size open end wrench required, although it could be metric, 8mm, start with the furtherest wheel from the master cylinder, have someone pump the brakes until they are tight, then loosen the bolt until the pedal goes to the floor, retighten before they release the pedal, continue doing this until you get just fluid coming out, no air or bubbles, you may need to keep adding brake fluid will you are in the process of bleeding them as you will be steadily letting it out

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1 Answer

Why does ny service break system light and abs warning light come on gmc yukon 2003


CHECK FUSES TO BRAKE AND ABS BRAKE SYSTEM.IF FUSE OKAY NO BLOWED BULBS. YOU HAVE A ELECTRICAL PROBLEM IN BRAKES AND ABS BRAKE UNIT.THE DEALERSHIP HAS TO FIX.

Jun 09, 2010 | 2004 GMC Yukon

3 Answers

Gmc yukon has the abs & parking brake light


you have to fix the problem with ur brakes- first check the wiring ,connectors and connection clips to the abs sensors and modulator if looks ok than have truck scanned some auto stores such as auto zone / advanced auto do it for free the code will give u a start point towards fixing ur problem--visual inspection of brakes doesnt always show problem

Nov 26, 2009 | 2001 GMC Yukon Denali

1 Answer

Driver side brake not bleeding properly after bleeding left side and changing rotors, calipers, and pads?


first of all make sure master cylinder is full of brake fluid.then you crank car leave foot off brake pedal. watch abs light on dash it should turn off in 10 seconds if not have car towed to garage or dealer. they have to use a scanner to scan the abs brakes if abs light turn off in 3 seconds. then starting bleeding from master bleed the lower brake line fitting at the proportional valve followed by the upper brake line fitting. keep eye on brake fluid in mastercylinder dont let run dry.next prime the abs hydralic modulator.connect the bleeder hose to the rear bleeder valve on the modulator.place the other end into a container partially filled with cleab brake fluid.make sure the end of the hose is submerged.open the bleeder valve slowly about 1/2 to 3/4 turn have an assistant depress the brake pedal and hold it in the depressed position. when the flow of fluid ceases close the bleeder valve.repeat process until no air bubbles are present in the fluid.then tighten the bleed valve securely. start bleeding brakes. your bleeding sequence is right rear - left front - left rear - right front.WARNING IF ALL FAILS YOUR BRAKES DONT FEEL SOLID AND FEEL VERY SPONGY.DONT DRIVE CAR. HAVE IT TOWED TO DEALERSHIP.THEY WILL HAVE TO PRESSURE BLEED YOUR BRAKE SYSTEM.

Nov 17, 2009 | 1999 Oldsmobile Alero

1 Answer

2003 Sonoma SLS 6 cylinder 4.3L ABS issue


I WOULD NOT KEEP DRIVING IT.WHEN ABS LIGHTS AND BRAKE LIGHTS COME ON.YOU HAVE BRAKE FAILURE. TOW IT TO DEALERSHIP HAVE IT SERVICE.AND CHECK THE ABS BRAKES SYSTEM .BECAUSE ABS BRAKE SYSTEM IS NOT A HOME FIX.BECAUSE THE ABS HYDRAULIC MODULATOR UNIT HAS LOWER FROM HOME POSITION .IN ORDER TO MOVE THE MASTER CYLINDER FROM UNIT.YOU NEED A TECH 2 SCANNER TO DO THE JOB.TO GET ABS BRAKES TO BLEED RIGHT BEST TO GET THEM PRESSURE BLEED INSTEAD OF MANUAL BLEEDING GET LESS AIR IN SYSTEM.THAT WHY SEE DEALER SHIP HAS THE THINGS TO DO THE JOB.

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2 Answers

ABS bleeding technique on GMC Yukon


If you forced the pads back into the calipers without loosening the bleeders you probably forced gunk into the abs modulator valves. Sometimes doing the automated bleed proceedure (need Tech or Bi Directional Scanner) will bring things back to life.

Nov 30, 2008 | 2003 GMC Yukon XL

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