H3 Sound in my Rear brakes

[HummerH3]

Hi guys I went to the beach with my H3 and after couples of days I realize that there is some sound coming from the rear wheels like a grinding sound, when I apply the brake it get much louder and I went to the dealer to check my brakes he said that its fine!!! Any Ideas?

 

[Scarsman]

Could be a small rock stuck between the rotor and the backing plate.

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[alrock]

Yeah, if you were at the beach you could easily have sand or rocks causing issues. If the dealer couldn't find it, can you jack up the rear of your truck and check it yourself?