Brake Abs Warning Light problems of the 2008 GMC Canyon

This happened numerous times. Mainly when first starting the vehicle. The abs sensor warning sound would come on and when starting to move the vehicle and engaging the brake pedal for the first time the abs brakes would actually engage(vibrating pedal) and it would feel as though the truck wasn't going to stop. After it did stop and continue to move forward the normal brakes would engage. Then the warning sound/beep would stop but the abs warning light would always stay on. After numerous times happening I brought it back to the dealer I bought it from and they told me I had a defective abs sensor in the right front wheel. I asked them if it was still under my 6 year warranty and they told me no. It would cost me about$1000 to fix. I told them not to fix it. After, I made numerous complaints to different levels of GMC customer service and got nowhere with them. I complained because I felt this was not something caused by me and was obviously a factory defect. After getting nowhere with GMC I brought it to a local mechanic and had it repaired $900. I write this complaint to you because this is dangerous and feel if it happened to my GMC Canyon it probably happened to many others and would force gm to recall them. Thank you.