One problem related to brake drum wheel cylinder has been reported for the 2001 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota Sienna based on all problems reported for the 2001 Sienna.
Toyota Sienna brakes pedal goes down to the floor giving not enough braking to stop vehicle. The brake work has been done on this Mini-van three times within last 2~3 years at Toyota dealerships service center but the condition has not been improved. The dealership has worked on both front(disc brakes) and rear(drum brakes) including part replaced and repaired. Brake cylinders at rear tires replaced. The front disc had been changed with brake shoes. Rear brake rotor was machined and brake shoes have been replaced. None of the old parts are available with vehicle owner.