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Re: 2002 gmc 2500hd 4wd abs problems
The problem is most likely a wheel speed sensor at one of the front wheels. retrieving a code in the abs system could pinpoint which wheel it is. i believe the wheel speed sensor is part of the bolt on front wheel bearing assy. if you plan on doing this yourself and are mechanically inclined. you will need an a/c volt meter to check sensors. let me know if i can assist further.
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Sounds like a fault with the Antilock Braking System. The vibration in the pedal is the ABS working. With your foot on the brake pedal, it releases and re-applies the brakes to stop a skid from the wheels locking up. You need professional service for brakes.
Seems to be a known issue on all Cadillac and requires the ABS module to be replaced.
I had the same problem with my 2002 Silverado. The grease seal on the right front wheel bearing went up letting grease build up on sensor . Disconnect ABS sensor wire at wheel one wheel at a time. Abs light on dash will come on but that's ok. drive and stop easy with wire disconnected until brakes feel normal. Then you will know wheel is the problem.
There's speed sensors at each wheel. You may have got some contamination in front of one of them... sounds like the abs is trying to compensate for un equal speed at each wheel... and something may be blocking a proper read at one of the wheels...
There was actually a recall for this. Go to your local GMdealer and have them check your VIN for a recall. If not under recall get out of there its easy to repair yourself don't let'em fool you.Remove the front pads caliper and rotors. Locate the abs sensor mounted to the wheelbearing assembly by a small socket head cap screw (Allen wrench). Removethe bolt and softly gently/wiggle the abs sensor around until it pops upout of the hole. some will break, which is why it wouldbe nice if the recall applies to your vehicle that way if they break gm replaces. Once you get both sides removed, clean themounting surface of all rust or build up with w-d 40 and small steel toothbrush then wipe off excess with clean rag and mild soap and warm water, dry completely make sure no spray residue exist on parts, Next apply a thin layer of lubricant grease to preventfuture rusting and reassemble.The rust build up under the sensor is causing the angle to change resultingin inaccurate wheel speed readings in the abs module your abs module will interprets this asa wheel is either slipping or skidding and applies your abs. This should make you happy with no more irritations. Please rate me. If you need further assistance you can always ask me. Good luck with this.