Brake Disc Pads problems of the 2005 Toyota Sienna

I purchased a new 2005 Toyota Sienna minivan from a local dealer in 2005. At 15,000 miles the dealership replaced all 4 rotors/brake pads/tires under warranty. Since then about every 10,000 - 20,000 miles the vehicle needs new rotors and brake pads. We now have 61,000 miles on it and are on our fourth set of pads and rotors. The dealer claims this is "normal wear and tear", but this is the worst performance I have ever heard of from a braking system.

The contact owns a 2005 Toyota Sienna. The contact stated that when she was driving over rough surfaces, bumps or potholes and trying to depress the brake pedal, she noticed a grinding sound and the brake would not seem to engage immediately. She stated that the condition seemed to exist on extremely bumpy roads. She took the vehicle to the dealership 3-4 times and the brake pads were replaced and rotors were resurfaced. However, the issue was still present after the repairs. She had not spoken with the manufacturer to-date. The current mileage was approximately 76,500. The failure mileage was approximately 43,000.

I was traveling this past Tuesday, may 1st, and I notice a slight noise from the inside of my van when I had reached my destination. It happened when I applied my brakes but when I roll down my window I hadn't noticed any noise from the outside of the van. I was alone and did get out and I hadn't noticed anything in or around the front left tire. I had to travel another 1 and a half back home and by this time my car was making a horrible noise. I had a mechanic look at the car and informed me that the rotor was messed up and the brakes where metal to metal. I only have 29,000 miles on my van and he told me that this shouldn't be doing this until its due to a defect such as a bad caliper or the brakes where getting hung up. I called Toyota and they told me that they would correct this problem until I arrived and then they told me that this is normal for Toyota Sienna minivans. I am concerned that there is more to the problem because my brakes never squealed or squeaked and its only on the left side.

Rear brakes, both, pads completely worn away or separated from backing plate. The vehicle has only 22000 miles on it. In my type of driving, brakes normally last at least 40,000 miles. Front brakes appear to be ok, wearing normally.

Ever since this vehicle was brand new it has continued to exhibit occasional problem with brake pedal becoming hard, with little or no play, necessitating the need to push very hard on the brake pedal to affect stopping. Normally the brakes are very good. There does not appear to be any particular cause for this I. E. Pads being wet, road salt, etc. It only occurs occasionally and seems to go away after driving for 20-30 miles. When it does occur though it is difficult to stop.