One problem related to brake foundation components has been reported for the 2003 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Toyota Sienna based on all problems reported for the 2003 Sienna.
Brakes squeak when applied at low speed. Dealer fixed it three times, but it is back again. The van was purchased new and is still under 3 year/36,000 miles warranty.