One problem related to air brake has been reported for the 2006 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Sienna based on all problems reported for the 2006 Sienna.
Brakes squealed within days of purchasing new Sienna 8-seat Mini-van. It was returned to be fixed to dealer who "glazed" the brakes. Within days they were squealing agin. It was again returned to dealer who replaced rear drums and shoes. Within a few days the brakes were squealing again. It was taken to a second dealer who again replaced rear drums and shoe but within 24 hours, the brakes were again squealing. It has less than 4000 miles and has had less than a week when the brakes have not been squealing. Additionally, it takes excessive force to close back hatch.