Two problems related to brake disc caliper have 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.
Since 7/2019 to now, 10/2019, I've had intermittent hard brake pedal. Letting up on the gas pedal, the van begins to stop right away. There's no rhyme or reason for the hard brake pedal, its affecting the front right wheel, and it smells bad. There's a vibration at times, and wobble. After the van sits for an hour, the brakes are fine until next time. Today, backing out of a parking spot, it was difficult to put the van in reverse, and letting off the brake, the van wouldn't roll back. I had to give it quite a bit of gas to get it to move. The van didn't want to go more than 10mph in a 35mph zone. All of this has happened since a new brake booster was installed. There is a new caliper on that right side, and both front brakes got new brake lines. The pads still have a lot of meat on them. I can drive the van just fine, then sometimes get back in the van later, 1 to 6 hours later, and the brake pedal is hard. It occurs when the van has been sitting all night and half the next day, or it can happen when I'm driving it. There is something wrong with the brakes on my 2005 Sienna. Nobody can figure it out.
We have a 2005 Toyota Sienna Mini-van. At 16000 miles, it had a routine check and was found to have a stuck caliper in the front and so the dealer replaced all four rotors, brake pads, and tires. Now at 52000, the van was taken in for inspection and found to need all four rotors, brakes pads, and tires replaced again. We checked some web sites and found many people with similar issues with the Sienna. I contacted Toyota and their response is that this is normal wear and tear. I have had many vehicles and have never had to replace these items every 30,000 miles or so.