One problem related to brake hoses, lines/piping, and fittings has been reported for the 2005 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Sienna based on all problems reported for the 2005 Sienna.
When trying to stop brake petal went to the floor. The vehicle would not stop and the consumer vehicle collided with another vehicle which was stopped at the stop light. The vehicle was towed to the dealer and the brake shoes and pads were inspected. The dealer also bled the brakes and found air in all the lines except the right rear. The consumer asked the dealer how air got in the lines and they replied that they didn't know.