WHEN I PRESS THE BRAKE TO STOP THE VECHILE AT UNPREDICTABLE TIMES THE ABS KICKS IN AND THE TRUCK DOES NOT STOP. IT HAS CASUED SEVERAL CLOSE CALLS AND 1 SMACK INTO A GARAGE DOOR. I TOOK TO MY MECHANIC AND HE SAID THIS WAS A COMMON PROBLEM ON THIS TRUCK AND IT WAS THE WHEEL SPEED SENSORS. THIS TRUCK HAS ONLY 24,000 MILES ON IT BUT IS OUT OF WARR DUE TO AGE. DEALER WANTS $400 TO FIX, BUT IT APPEARS BASED ON MY MECHANIC AND REPORTS READ ON INTERNET THIS IS A BIG PROBLEM AND GM SHOULD DO SOMETHING ABOUT IT.