I would give all 4 corners a visual check & a good cleaning. Check the adjustment, too. Of course, you're looking for leaks, buildup, corrosion, wear, etc.
How long before you do your modifications? It might be worth replacing the hoses, wheel cylinders, steel lines, or shoes in the meantime.

cm

If you can't fix it with a hammer and screwdriver, you need a bigger hammer.
1965 Chevy C10