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The noise does not go away when the brakes are lightly tapped.

Frozen caliper? Constant contact with the brakes might do that. Can you jack the truck up and rotate the wheels, see if there's any noise like a dragging pad?

Of course, we're working on the presumption that this is a brake problem.

If you're at your wits end, and you're in Boulder, swing by Import Specialists (Dick, Rick, and Lynne) over on east Arapahoe. Good, honest people that'll set you straight. Tell them that I sent you...
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