Clunking from my front end during breaking...

[chev4life]

Not sure if this goes here or in the suspension area, but...

Story first...I was driving my 1965 Chevy II home in traffic a few weeks ago, all was good. Then all of sudden after sitting in stop and go traffic for 25 min or so I start hearing this clunking sound from the front end during quick breaking. I was hoping it was hot breaks but no, it's still happening.

Background...the breaks were freshly bled, new driver front line to the caliper. The master and booster are new. Front disk, rear drum. It's a Heidts front clip, drop spindles, mustang II geometry.

Detail...the clunk doesn't happen on slow/coast stops, but if there is any nose dive due to stopping it is very prominent....almost like a "roll-bang" if that makes sense. I can make it happen by bumping the breaks hard as well at slow speeds. I haven't noticed at high speeds but haven't gone over 20 since the first incident.

We were thinking it could be a sticking caliper, wheel bearings, hub???? Any ideas on how to trouble shoot this? Thanks!