One problem related to brake disc caliper has been reported for the 2008 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Sienna based on all problems reported for the 2008 Sienna.
Problem with rear disc brakes in 2008 Toyota Sienna. Dealer found problem with caliper piston. Rust on clip apparently caused the caliper piston to stay extended and keep the disc brake pad in contact with the brake. Rear brakes failed at 33k miles. Repair performed at customer expense. Service person said warranty did not cover brake failure because it was "caused by rust. " brake failure occurred approximately one month after the 30k mile service.