One problem related to brake disc has been reported for the 2001 Toyota Previa. The most recently reported issues are listed below.
In 4 months my new cars front brakes weared out with 4500 miles, with lot of fights with my dealership they fixed it for free and I have a cousin who has the same car with same problem and glendale Toyota fixed his for free too, glendale Toyota told my cousin that they are getting lot of problems with this cars front brakes going out to soon and Toyota motor CO. Is tring to keep it quit so you NHTSA does not know about this problem.