One problem related to brake drum has been reported for the 2003 Toyota Matrix. The most recently reported issues are listed below.
I had a flat tire and changed it but when I took off the tire the brake drum came off with the rim. I put on the spare and the next day driving to discount tires in lynnwood on the freeway I had no brakes, the brake fluid had leaked out. I had the car towed to magic Toyota in edmonds and they said it was my fault because I should have known and that it " sometimes happens. " I have never heard of it happening and not being a mechanic I had no idea, other mechanics I have talked to say it should not have happened. Toyota refused to cover brake repair under warranty.