Jump to content

Service Brake System Message...


Recommended Posts

I've been getting an intermittent Service Brake System Message along with the ABS light and Parking Brake warning light on my 2003 GMC Yukon 2wd with the 4.8l motor. Sometimes it will be days or a week or two between getting the message or maybe one day to the next but they always clear up after I drive a little, stop and restart the truck,. Sometimes it is as quick as just driving just a couple hundred feet and restarting the truck or it may be when I reach my destination. I'm hoping that it is just an intermittent failure from one of the front ABS sensor but is there a way to check the sensors out with a multimeter to make certain that it is them or just a way to trouble shoot the system in general. It is kind of a tough one since it is an intermittent issue. Thanks in advance!

 

IMG_2606[3350].jpg

Link to comment
Share on other sites

I've got simlilar message. Service brake booster. Read up on it and it could be many things including:

- replace brake booster or vacuum pump (wasn't for a silverado though)

- poor contact of the sensor due to rust/corrosion

I can't remember the last one, but best to take it to a mechanic because it seems pretty random

 

  • Like 1
Link to comment
Share on other sites

It's also common for the ground connection to be a problem for the abs computer.  It's located on the wing, just off the frame under the driver's seat.  Unbolt the wires from the wing, clean the connectors and the wing, bolt them back down and smear some dielectric grease over them.

  • Like 1
Link to comment
Share on other sites

Thanks guys, I'm guessing that you mean these two grounds attached to the body mount perch under the drivers footwell just behind the front wheelwell? If so, I'll clean them up and put some DI grease on them this weekend.

 

IMG_2628.jpg

Edited by Mark Francois
added picture
Link to comment
Share on other sites

Well, the grounds were not the issue so I got off my lazy butt and tested the sensors themselves. What I found was that the passenger side sensor output was half the voltage (AC) of the drivers side. I belive that testing the sensor with a multimeter on AC while spining the tire is the proper way to check function. I know that the rate in which I spun each wheel was not exact betwen the two but it wasnt so much of a difference that the voltage should differ by half. What do you guys think? Something else I noticed while troubleshooting this issue is that when not in alarm, unplugging the drivers side sensor only illuminated the abs light but when unplugging the passenger side sensor tripped the abs and brake icons in the dash. Is this the intent to help mechanics differentiate between faulty sides or am I seeing something else and don’t realize it?

Edited by Mark Francois
Link to comment
Share on other sites

  • 2 weeks later...

Well, changing out the front two abs wheel sensors didn't fix the issue. At first it seemed right but then it lot up again then it was off and then it was on again lol I didnt mind the work it took to swap those out but dang I’m tired of this intermittent problem garbage!  

Link to comment
Share on other sites

  • 2 months later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    245.8k
    Total Topics
    2.6m
    Total Posts
  • Member Statistics

    333,234
    Total Members
    8,960
    Most Online
    Donald Dolan
    Newest Member
    Donald Dolan
    Joined
  • Who's Online   4 Members, 0 Anonymous, 655 Guests (See full list)



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.