Squeeking heard at times,quiets when applying brakes,

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This "Squeeking" sounds like a bearing squeek or when a brake pad is "Glazed", It rolls with the truck ,picks up with higher speeds,quiets when applying brakes, may come back on when turning steering wheel or even just driving straight.I have stopped truck and pumped brakes "hard" and seems to stay quiet longer ................loose brake pad(s) ????????