My 2001 does it... my brother in-law's full-size Chevy "Gladiator" conversion van does it, my GMC Yukon did it... My Avalanche now does it, and what do all these vehicles have in common? A rear AXLE. (vs. vehicles w/rear independent suspension. My theory is that during moderate to aggressive braking to an abrupt stop, the friction material grabs onto the (pad/disk or shoe/drum style) steel surface of the drum/disk during braking, hard enough to cause a slight axle "wrap" or forward roll just at the point where the last bit of forward momentum happens, causing the axle wrap amd tension it causes to be locked in place by the brakes. Once you let go of the brake, fronts just release, but that "sprung tension from the "wrapped" rear axle being released is what results in the clubk. Next time you hear it, see if you can differentiate where the sound originates, and you'll find (like people have said here) that mild subtle braking to a stop seems not to cause it, while a bit harder braking to a more abrupt or lurching stop seems to cause it.
Sorry this so long, but hopefully the theory helps a few folks have peace of mind for what this is.
Brian
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