AT LOW ENGINE RPM THE BRAKE FORCE BECOMES EXTREMELY EXCESSIVE. WHILE BACKING DOWN A LONG BOAT RAMP LAST WEEK THIS OCCURRED AND MY WIFE COULD NOT PRESS HARD ENOUGH TO STOP THE VEHICLE RESULTING IN A COLLISION TO AVOID THE VEHICLE GOING INTO THE WATER. I CONTACTED CHEVROLET AND WAS TOLD THERE WAS NO RECALL ON THIS VEHICLE.