Have a Car Question? Ask a Mechanic Online.
Hello, My name is XXXXX XXXXX I will try my best to help you with your vehicle issue. Just to make sure it is the ABS system doing this - have you tried pulling the fuse and test driving?
Do you know what the ABS code is?
Does it only do it when slowing down to a stop - say about the last 10-15 feet?
Our chat has ended, but you can still continue to ask me questions here until you are satisfied with your answer. Come back to this page to view our conversation and any other new information. What happens now? There were some standard questions that I needed to know.
I'll await your reply so that I may contine to help you.
Does it when you are sitting still - that's a new one.
The ABS activates when it senses a different/slower AC signal from one of the sensors.
A scanner to know what the codes are would be helpful.
Does everything else on the vehicle operate properly?
Any warning lights on?
I ask these questions because if there is nothing else happening, we need to check some electrical wiring.
Do you have a multi meter?
1. My mistake - does it activate going any certain speed or mainly over bumps and such?
2. Does the issue ONLY occur when the ABS light is on or off?
3. Could you send me your VIN?
I want to look up your specific ABS system through GM.
4. When the motor is making noise & pedal is hard - does the brake pedal "pulse" up & down?
Thanks for the info - since I can't hear or feel it, I'm trying to narrow down the area.
5. Have you had the codes read - Autozone and places like that do it for free.
This bulletin is being revised to update the correction and warranty information. Please discard Corporate Bulletin Number 02-05-25-006A (Section 05 - Brakes).
Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.
The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.
Measure AC voltage and clean wheel speed sensor mounting surfaces.
(Canadian P/N 89022218)
(Package of 2 cans)
Rust Penetrating Lubricant
(Each can will service 50+ vehicles)
(Canadian P/N 993037)
(Package of 12 tubs)
Wheel Bearing Lubrication - Tub
(Each tub will service 25+ vehicles)
Place unused material on dealer shelf for future use.
For vehicles repaired under warranty, use:
Front Wheel Speed Sensor Inspect and Clean (Both Sides)
* This is a unique labor operation number for use only with this bulletin. This number will not be published in the Labor Time Guide.
© Copyright General Motors Corporation. All Rights Reserved.
This is what I am thinking but I would like to PROVE it :)
I'll follow up
OK - so it is definitely the ABS system causing the issue.
Did you understand the TSB I sent you? I know you did the one front hub - have you ever replaced the other front hub?
I did run your VIN and there are no recalls for it - but the previous TSB DOES apply to it. We need to start there to resolve the issue.
Oh no - I own a shop and I NEVER recommend hubs in pairs - you do them as they fail. There are so many road conditions that come into play on individual hubs.
If you DO want ABS, I would recommend the repair procedure on BOTH front hubs.
It's kind of time consuming - it takes us about 2 hours to do them AND the possibility exists that the sensor is so corroded into the hub - it breaks - then YOU ARE left with the choice of a new sensor or replace the hub assembly.
We always perform the repair bulletin on new hubs that we install so we don't have the issue in the future.
If you can't afford it or don't care about ABS - leave the fuse out. -- QUESTION THOUGH-- with the fuse out, does your cruise control work - some vehicles it doesn't.
Hmmm... computer is probably tied into the fuse somehow.
And THAT would be why we can't just leave the fuse out-- sighhhh....