One problem related to brake antilock control unit/module has been reported for the 2004 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota Sienna based on all problems reported for the 2004 Sienna.
My wife was in an accident whild driving our new, 2004 (3400 miles) Toyota Sienna. We beleive that the cause of the accident was antilock brake failure. The car was traveling at 15 miles per hour. She went from accellerator to brakes and the brakes never applied. She slammed into the car that was in front of her. We have tried repeatidly to contact Toyota but they have never called us. The dealer is not providing us any assistance and are dismissing our assertions as rediculous. Please help us.