I WAS DRIVING DOWN THE STREET WHEN A BUS PULLED IN FRONT OF ME TO MAKE A LET TURN. I WENT TO APPLY THE BRAKES AND I ONLY GOT A PULSATION IN THE BRAKE PEDAL AND THE VEHICLE WOULDN'T SLOW DOWN UNTIL IT WAS TOO LATE. THE FRONT OF MY VEHICLE HIT THE SIDE OF THE BUS CAUSING SIGNIFICANT DAMAGE TO BOTH THE VEHICLES. AFTER THE ACCIDENT I NOTICED THE TRACTION CONTROL AND ABS LIGHTS WERE ILLUMINATED. AFTER THAT ACCIDENT THE BRAKES HAVE BEEN DOING THE PULSATION AND INABILITY TO STOP. I HAVE BEEN TO THE DEALERSHIP NUMEROUS TIMES AND REPLACED WHEEL HUBS AND SPEED SENSORS AND THE PROBLEM STILL PERSIST. THIS IS AN EXTREMELY DANGEROUS PROBLEM AND GM HAS DONE NOTHING! *TR