Our T&C has a nasty clunk noise from the left front when braking? The struts, the control arms, sway bar bushings, sway bar links, rack and pinion, front transmission mount have all been replaced.....and still the clunk on braking continues....... anything else to consider??

 

You say when braking but your repairs relate to going over bumps and uneven surfaces.
So your looking at brake caliper issues here. Maybe I say as this fault eludes me at mo. Check your brake calipers for security and pads are intact.
If things get head scratching, disconnect your steering rod ends and try turning your struts by hand as this relates to top strut bearing and is a tell-tail.

 

Here's another. While wheel on ground grip top of wheel and pull and listen for your clunk. Is it there. Think this is the top strut mount issue. Also as I found when renewing my control arms the front through bolt connecting the arm to the chassis is a rattling fit so tighten it when wheel on ground.