OUR LAND ROVER DISCOVERY LOST STEERING AND BRAKE CONTROL WHILE ON HIGHWAY 99 NB SOUTH OF THE TOULUMNE RD EXIT. WE WERE TRAVELING AT LOW HIGHWAY SPEED (50-60MPH) WHEN WE NOTICED THE VEHICLE TO BEGIN SWERVING LEFT AND RIGHT CAUSING THE BODY TO PITCH DRAMATICALLY WITH NO RESPONSE FROM STEERING, WHEN THE BRAKES WERE APPLIED THEY WERE UNRESPONSIVE. THE DIRECTIONAL OCCASIONAL INCREASED WHILE WE TRAVELED APPROX ANOTHER 500 YARDS BEFORE WE HIT THE EDGE EMBANKMENT AND ROLLED OVER. ENGINE CONTINUED TO RUN IN THE OVERTURNED POSITION. *TR