Question.help....I know i posted about a week ago...

Sometimes when I use my brakes my brake pedal goes crazy and a roaring noise comes from the front of the truck on the driver side,I think like where the brake booster is at. But when I’m slowing down my brake pedals starting shaking , sometimes going up and down I get my foot off the pedal and it goes away , when I re-applied it starts to brake like normal. Today I was going like 15mph(maybe slower) and starting to slow down to a stop because of a stop sign and a car waiting for its turn. Well that’s when I almost hit him. I apply my brakes and it started doing it. So I get off the brakes and reapply and I come to a stop with no problems. It seems to only happen when I’m below 20-25 mph never really had chance to judge because it doesn’t happen all the time. Sometimes though it’s not as rough as some other times it has happened. I have been trying to get it the dealership, but with school and work I been having trouble getting it to them. I’m just looking for some type of information I can ask the dealership to check out. So they can’t just charge me and say nothing is wrong with it. Of if anyone has experience this before can give me some pointers to fix it.
It doesn't happen all the time but maybe few times a day.

Sometimes when I use my brakes my brake pedal goes crazy and a roaring noise comes from the front of the truck on the driver side,I think like where the brake booster is at. But when I’m slowing down my brake pedals starting shaking , sometimes going up and down I get my foot off the pedal and it goes away , when I re-applied it starts to brake like normal. Today I was going like 15mph(maybe slower) and starting to slow down to a stop because of a stop sign and a car waiting for its turn. Well that’s when I almost hit him. I apply my brakes and it started doing it. So I get off the brakes and reapply and I come to a stop with no problems. It seems to only happen when I’m below 20-25 mph never really had chance to judge because it doesn’t happen all the time. Sometimes though it’s not as rough as some other times it has happened. I have been trying to get it the dealership, but with school and work I been having trouble getting it to them. I’m just looking for some type of information I can ask the dealership to check out. So they can’t just charge me and say nothing is wrong with it. Of if anyone has experience this before can give me some pointers to fix it.
It doesn't happen all the time but maybe few times a day.
you have the dreaded abs problem. heres the text of the tsb.


2002 Chevy Truck K 1500 P/U 4WD V8-5.3L VIN T Copyright © 2005, ALLDATA 8.60 Page 1 Brakes and Traction Control: By Symptom Brakes - Low Speed ABS Activation File In Section: 05 - Brakes Bulletin No.: 03-05-25-007A Date: September, 2004 TECHNICAL Subject: Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) Models: 2002-2004 Cadillac Escalade, Escalade EXT 2003-2004 Cadillac Escalade ESV 1999-2004 Chevrolet Silverado 2001-2004 Chevrolet Suburban, Tahoe 2002-2004 Chevrolet Avalanche 2003-2004 Chevrolet Express 1999-2004 GMC Sierra 2001-2004 GMC Yukon, Yukon XL 2003-2004 GMC Savana This bulletin is being revised to update the correction information. Please discard Corporate Bulletin Number 03-05-25-007 (Section 05 - Brakes). Condition 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. Cause 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. Correction Measure AC voltage and clean the wheel speed sensor mounting surfaces. 1. Raise and support the vehicle. 2. Disconnect both the front wheel speed sensor connectors at the frame and harness. 3. Place a Digital Volt Meter (DVM) across the terminals of each wheel speed sensor connector. 4. Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. 5. Plug the wheel speed sensor bore in order to prevent debris from falling into the hub during service. 6. Clean the wheel speed sensor mounting surface using a wire brush, sand paper, emery cloth, scotch brite, or other suitable material. Be sure to thoroughly clean the wheel speed sensor surface. There should be no rust or corrosion. 7. Check the sensor head to determine if it has been warped/distorted due to the corrosion build up or other causes. Check the mounting surface on the sensor head for flatness by placing it on the edge of a metal machinists scale or other suitable straight edge to measure the flatness. Check the sensor for flatness in multiple (minimum 3) positions/directions. If the sensor head is distorted, replace the sensor. 8. Apply a thin layer of bearing grease to the hub surface and sensor 0-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (Canadian P/N 993037). 9. Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel

you should have gotten a recall notice in the mail about this.Mine is a 99 and I had the sensers replaced a few weeks ago. Took about an hour,no cost involved.

Well took it to the dealership finally. I having them looking at the steering wheel and the brake problem. The good news is they found one problem. But they don't know what the brake problem is. So they still have the truck. It did happen to them though. The steering wheel would make a scraping noise when you turn the wheel, but go away when you drive.

that "scraping" is normal to an extent especially when the wheel is turned all the way one direction or the other, if you try to turn it when the wheel is all the way one direction, and it wont go farther, it will make that noise.

as for the abs thing, i didnt know that was a recall lol. i always thought that was just normal, as the brakes are instantaneously pulsing on and off to keep the wheel from locking up. i always thought that vibrating feeling in the pedal was normal...

Alright, they found the problem. It's the hub assembly in the driver side front wheel, something about the sensors. Anyways they have to overnight the part. Soo GMMerlin i think works at a dealership, Can you tell me what that means ? Or does anyone have info about what a hub Assembly is and what does it do.

About the steering wheel, it would happen when i was turning it no matter how far it turned. They said it was a bearing.