Normal driving conditions with consistent vehicle maintainence. The ABS module failure occurred without warning. The braking system in the vehicle seemed to lose power and required more than normal braking time. I took the vehicle in for repairs immediately at a cost of $1,000. I was told it is due to a faulty part that General Motors is aware of but refuses to recall due to the 750,000 1999 Silverado on the road. At a part cost of $700 you can easily do the math. A recall must be in order. These heavy trucks are not safe on the road if not a class action lawsuit is in order.

- Carlsbad, CA, USA

The consumer shut the vehicle off and the brake pump will not shut off. It continued to pump even when the ignition is off the dealer stated that the control module on the ABS brakes is defective.

- Eden, UT, USA

At 38000 miles my ABS control module failed. Two local dealers informed me that GM has had a lot of problems with the ABS module at a cost of $1200.I called GM customer assistance and got no assistance.I would like someone to look into the ABS module failure problem.

- Kettering, OH, USA

The service ABS light on my 1999 Silverado went on, and I noticed a humming noise coming from under the driver side of my vehicle. I traced the noise to the ABS control unit. The pump on this unit would continue to run after the ignition was turned off. The only way to stop the pump from continuously running was to remove the ABS fuse which disables the ABS braking system. I contacted GM but they're advice is to take to a dealership for repair. In the meantime, I am operating the vehicle with ABS disabled.

- Monument, CO, USA

The ABS controller failed which allows ABS pump to run continously. Must pull ABS fuse to stop pump. Lack of ABS system in pick-up truck very unsafe due to weight distribution. Have read many similar complaints specific to this model. Per www.circuitsolutions.com, very common problem. Claims switch voltage overloaded.

- Fontana, CA, USA

Anti lock brake system - I have documentation starting from 2 months after the purchase of my 99' Chevy Z71 complaining of the brake system. Every time I took the vehicle to dealer, he said "oh, that's normal". I have taken to the dealer numerous times over the course of time for all sorts of defects with the brakes being the biggest problem. The last time I took it was for the anti lock brakes was one month prior to the warranty going out. Once again, "oh, that's normal". once my warranty expired, so did my anti lock brakes. Even with documentation, the dealer would not fix it and Chevrolet said I had to go through the dealer. I have a stack of documentation from where this vehicle has been in the shop for malfunctions as well as pretty much everything that can go wrong with a vehicle. I am upset because this is a problem that need fixing from the start and the dealer or Chevrolet would make it good.

- Seneca, SC, USA

ABS control module failed at 31,000 miles. Part alone is over $800. Dealer apparently unwilling to do anything. Never buy a GM product again!! buy imports, they make better cars and provide superior service by far! when someone dies due to this problem, hope GM and NHTSA get the hell sued out of them for doing nothing to take care of a very serious safety issue that exist and both parties have known about for some time. Question to NHTSA! if I check fatalities box as 4 people dead!! then will you act"?"

- Boyntonbeach, FL, USA

Faulty 4 wheel drive switches &ABS modules running non stop. Dealer says they see a lot of these but there are no recalls. An average of 1 per week.

- Maysville, KY, USA

The ABS pump keeps running after the truck is turned off.pump gets very hot and could cause fire. I had to unplug it to keep from overheating and in doing so I lost the anti-lock brakes. Now GM is going to take me for about $1600 for a problem they know they've had with this.this should be a recall.

- Shelbyville, IN, USA

After work today, I started my truck, the ABS light went on, and a loud noise came from underneath the driver's side. I called my GM dealer, and he told me it was the ABS module. He said a new one would cost from $400-500 dollars, plus an hour of labor. I bought it in July of 2003, spent a lot of money on accessories, and paid it off last month. Just after the dealer's warranty ran out(2300 mi), I now have an expensive repair. After much research and talking with parts supply companies, this is an on going problem. When will GM make ammends with their consumers? I am presenting 12 pages of documents to my dealer. Who knows, maybe they will admit there's a problem.

- Little Falls, MN, USA

ABS module failure. Continues to run after truck is shut off.

- Fountain Valley, CA, USA

ABS comes on and stays on. When ignition switch is turned off the montor on the brakes continues to run. The only way to stop it is to pull the fuse.

- Honoraville, AL, USA

ABS module runs contiually. Electronic brake control module attatched to the ABS pump malfunctions, causing the pump to run continually, even after the vehicle has been switched off. Local dealer is aware of problem, and has seen it before on several occasions. Local salvage yards can't keep parts on hand because of high demand. There is no recall!!!!!!!! why"?"

- Lagrange, NC, USA

ABS failure - the ABS light came on and loud humming noise coming from ABS system when engine is off and key is removed. Had to pull 60A fuse to stop the ABS system from continueing to make noise. Pulling this fuse also cause the main brake indicator light to stay on, thus I have no true indidcation presently if main brake failure occurs.

- Elgin, TX, USA

ABS electronic brake control module failed on truck. Replacement cost was $860. After reviewing the complaints on the internet this appears to be a common problem which the manufacturer should be responsible for fixing.

- East Tawas, MI, USA

The ABS control module went out on my 1999 Chevy Silverado Z-71 (four wheel disk) with only 60,000 miles. I was told the part would cost $1147 from GM, not including tax or labor. The ABS pump and motor continued to run until I disconnected the 60 amp fuse. Of course, now the ABS warning light stays on. I have since learned of at least 30 others Silverado owners with the same problem. The 99 model seems to have the most problem. GM refuses to recall the part, which is very expensive. Many of the other "victims" had less mileage on their vehicles than mine.

- Ozark, MO, USA

The ehcu for the ABS system on my 1999' Chevrolet sivlerado went out after just 53000 miles. I have found endless complaints about this on the web and it is a severe safety issue that needs to be fixed.

- Louisville, KY, USA

ABS module shorted out and now the antilock brakes are inoperable. This is a known problem by generals motors. Dealership said they replace several weekly. Also, 2000 Silverado`S have the same problem, and I beleive module they have been recalled for a new module. Told General Motors this and all they could say was "but sir yours is a 1999 model isn`T it". NHTSA please help us consumers. We are driving trucks without antilock brakes. How safe could this be? this is definitely a safety issue.

- Murfreesboro, TN, USA

ABS light came on then heard grinding sound of ABS motor running. Turned off vehical ABS motor still running without key. Took vehical to repair shop $1000 estimate to replace ebcm.

- Brighton, CO, USA

The ABS brake controllmodule is defective, had to pull the 60 amp fuse to get the ABS pump to stop running, the dealer says its a common problem and will cost $1000 to fix.truck only has 53000 miles on it.

- Poland, OH, USA