One problem related to brake disc has been reported for the 1997 Lexus LX450. The most recently reported issues are listed below.
The rotors on the disc brakes have warped three times in app. 8000 miles. The manufacturer concedes that the brakes are inadequate for the weight of the vehicle, when it is owned by people in hilly areas. The manufacturer also states that the problem of brakes overheating is pervasive, but says it is not a design flaw. I have asked the manufacturer to either provide a fix, or extend the warranty for the life of the vehicle, but the manufacturer has refused.