There are a couple of posts here on the strange noise that occurs under the dash near the brake pedal when applying the brakes. I call it a UFO whirring sound. After 2 years of chasing this noise down Kia figured it out to be the one way check valve from the brake booster. Kia replaced many brake components before finding this out. So I have to give them credit. The replacement was done today, and no noise! So, don't let the dealers tell you that this is a normal sound. It isn't.