Power Assist Hydraulic Brake problems of the 2002 Lexus LX470

While driving 70 mph on the highway traction warning indicator illuminated, and the vehicle lost brake power and steering for a period of one minute. During that time vehicle swerved left to right, but did not come in contact with any other vehicles or objects on the road. Traction light went off, and vehicle returned to normal. The vehicle was taken to a dealer, who did a diagnostic test. It was found that hydraulic unit on the brake booster was the cause of the problem, and was replaced.