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Username Post: Anti-lock brake light coming on intermittently        (Topic#196304)
BBT 
Senior Member
Posts: 631

Loc: San Diego
Reg: 03-18-02
08-12-08 04:05 PM - Post#1497961    

I tried to do a search, and "ABS" is apparently too short of a string to search by, and "anti-lock" only gets me threads about lock cylinders and door handles

Sunday I picked up the new/used Suburban for the the growing family: 2002 w/ 75K on the clock. K2500 with way more options than I have need for. Runs and drives great. Have put about 100 miles on it. Today the ABS light came on along with the Brake light while I was driving. The next time I started the truck those lights did not stay on, but the next time I started it, and the time after that, they did stay on. After another stop and re-start they did not come back on.

This just started, and I have not had a chance to find any rhyme or reason to it. Are there any suggestions for likely culprits which I should look for?

I have yet to pull the wheels off. Brake fluid level looks fine. Dark in color, but the level is fine. I plan to siphon the old stuff and bleed the system with new.

Suggestions are welcome.

Thank you.
Who is John Galt?


 
TwentyBucks 
Contributor
Posts: 283

Loc: Cape Cod, MA
Reg: 11-06-07
08-13-08 07:30 AM - Post#1498373    
    In response to BBT

ABS light coming on can be a sign of a bad front wheel speed sensor or maybe both sensors bad. If the front wheel speed sensors go it means you will no longer have ABS in a panic stop which means if you stomp on the brakes the tires will lock up and you will get lots of smoke but you will stop, maybe without the control you want but you will stop.
2010 Cadillac CTS
2003 Suburban 4X4
98 K1500 5.0L
2002 Honda Civic, commuter car


 
p.u. guy 
Member
Posts: 19

Reg: 01-15-03
08-13-08 09:02 AM - Post#1498432    
    In response to TwentyBucks

It could be a number of things, but I would bet it is a faulty ABS module. Chevrolet is notorius for that! Does your ABS pump continue to run after you shut off the engine? That is only one sign. You won't know for sure until the code is pulled with a scanner. You can now buy the scanner from Acton. They are not cheap, but the dealer will charge a fortune to scan it. If it is a faulty module they want over $ 600 for the module alone plus scan cost and installation. There are services on E-Bay that will rebuild them for $ 99.00 plus postage with a lifetime guarantee. Easy to pull the module off and you can still drive the vehicle, no ABS , but you probably don't have it now. I have the same problem on my 2000 S-10. I bought the scanner and determined the problem. I just have not fixed it yet. Has anyone used the rebuilding services and were they happy?

 
TwentyBucks 
Contributor
Posts: 283

Loc: Cape Cod, MA
Reg: 11-06-07
08-13-08 09:08 AM - Post#1498436    
    In response to p.u. guy

I brought my truck to a Midas Muffler shop and they scanned my system for free. Not sure if they all do it but its worth a try.
2010 Cadillac CTS
2003 Suburban 4X4
98 K1500 5.0L
2002 Honda Civic, commuter car


 
p.u. guy 
Member
Posts: 19

Reg: 01-15-03
08-13-08 09:17 AM - Post#1498444    
    In response to TwentyBucks

Did they scan for ABS codes or check engine light codes? Different scanners are required for the ABS codes. I tried every parts house etc. and no one had an ABS scanner, but everyone had a check engine light scanner and would scan for free.

 
TwentyBucks 
Contributor
Posts: 283

Loc: Cape Cod, MA
Reg: 11-06-07
08-13-08 09:52 AM - Post#1498469    
    In response to p.u. guy

Not sure which scan tool he had but I was standing right there when he scanned and it came back with a faulty front wheel speed sensor. Since they do not do tuneups I would think that all of the nationwide muffler and brake shops have the tool for scanning ABS brake codes.
2010 Cadillac CTS
2003 Suburban 4X4
98 K1500 5.0L
2002 Honda Civic, commuter car


 
beejay 
Ultra Senior Member
Posts: 12599
beejay
Age: 78
Loc: Pflugerville, Texas
Reg: 06-01-04
08-13-08 11:11 AM - Post#1498544    
    In response to BBT

As already said, either sensors or module. For module repair go to http://www.modulemaster.com/en/index.php . The warranty is better than a new GM module. That's what I did with mine. And the cost/installation on mine two years ago was $1200 from the dealer.
Bruce

'56 4-door BelAir, 350, Holley 600, Eddie intake, TKO 600, CPP P/S and A arms, Sierra Gold & Adobe Beige
2010 VW Jetta S/W, 2.5, 5-cyl,6-spd auto.
'87 Elkie, 350 with 700r4 tranny B&M floor shift
http://www.picturetrail.com/beejay3/"


 
Bad Bowtie 
Valued Contributor
Posts: 4514
Bad Bowtie
Age: 42
Loc: TX
Reg: 07-04-03
08-13-08 02:24 PM - Post#1498673    
    In response to beejay

I would try cleaning both of ur front ABS sensors 1st.
GMC. We are Professional Grade.

http://www.cardomain.com/id/2004VHO


 
95bigtime 
Member
Posts: 13

Loc: IOWA
Reg: 11-24-04
08-16-08 08:54 PM - Post#1501085    
    In response to Bad Bowtie

you can't clean the abs sensors on your surburban-they are integrated into the wheel bearing assembly. try taking it to a parts wholesaler that pulls codes for free or a shop with free estimates and then decide if it is something that you can handle. You can start by looking at the wires that come out of the wheel bearing and track them back inspecting for breaks or spots where the insulation is rubbed through.

 
BBT 
Senior Member
Posts: 631

Loc: San Diego
Reg: 03-18-02
08-17-08 08:19 AM - Post#1501264    
    In response to 95bigtime

Update: The vehicle won't repeat the problem

It did it three times one day, and hasn't done it since. Makes it a bit tricky to diagnose.

With regard to reading codes, I decided to call first before running over to Autozone to take advantage of their free code-reading service and was told that a law has been passed in the glorious and all knowing state of California prohibiting them from doing this anymore. (Insert political rant here ) On the other hand, they gave me a couple of options for repair shops which would scan codes for free.

Without the lights on, I have not pursued getting the codes read. I suspect that the BCM does not store code history as does the ECM.

I have pulled the wheels, and the brakes all look fine. Wires look fine. Fluid was fairly dark so I suctioned out the tank and filled it with new fluid, then bled the brakes until I got better looking fluid out.

Now I am just driving it around, looking to see if it will act up again.

Thanks to all for the information. I especially appreciate the information regarding rebuilding the BCM. Sounds like the aftermarket has GM whupped again.
Who is John Galt?


 
Jims56chevy 
Frequent Contributor
Posts: 2207
Jims56chevy
Loc: chino valley az
Reg: 11-23-04
08-17-08 08:33 AM - Post#1501271    
    In response to BBT

Reading your post I found it interesting what yoy said about autozone not being able to scan vehicles anymore in cali.Sounds like cali, but what i was getting to was that here in arizona autozone told me that there was anew bill passed that they can scan the vehicle but they arn't allowed to reset it for you, but they will let you use there tool to set it, but they can't do it.Crazy stuff.
56 210 2dr


 
95bigtime 
Member
Posts: 13

Loc: IOWA
Reg: 11-24-04
08-18-08 04:59 AM - Post#1501890    
    In response to Jims56chevy

abs does store history codes

 
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