2002 Dodge Caravan Braking Noise

On 9/17/07 I brought my van to the dealer as it was making a sort of clicking, grinding, rubbing noise when braking (left front side). They replaced the front and rear brake pads and resurfaced the rotors. I had to bring the car back on 9/24 as the noise came back and the the dealer recut the left front rotor. Then on 10/18 the van went back in the when the noises started again. The dealer changed the pads, disc brake-replace. The van started making braking noise about two weeks ago. It only happens when the van is on the road for about 10 minutes. You don't hear it when you brake sharply. When you are braking slowly you hear it. Clicking, rubbing and occasional grinding. Any suggestiions for when I bring it back to the dealer again?