Clicking from front hub on 4X4

[AirSpeed]

I noticed a clicking sound coming from my from front hub on my 72 GMC 4X4 the other, it doesn't do it while going forward, only in reverse. I never paid any attention to any sounds from the hub before so I have no idea how long it's been doing this or if it's normal. The only reason I noticed was because I was parked next to a wall and the sound reflected back to me. I replaced the hubs with new MileMarker Supreme hubs a few months ago if that makes a difference. Any ideas? Is this normal? Thanks!
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[hayhauler71]

Make sure the tabs on your brake pad [outboard pad ] is tight against the caliper and not banging around very common problem

[AirSpeed]

Originally Posted by hayhauler71

Make sure the tabs on your brake pad [outboard pad ] is tight against the caliper and not banging around very common problem

This a more definate clicking sound, very similar to the sound the cassette makes on my mountain bike, like pawls clicking
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[hayhauler71]

pull the lock out off and see if it goes away