If it only happens when you apply the brakes, most likely it's something to do with the rear brakes. You recently worked on them right? It seems to reason that something inside there is not in it's place. If the pads are not worn all the way down, metal to metal, then it would seem that something has come loose. Have you even pulled the drums to see whats making that terrible sound? Surely there is something wearing away in there. Hopefullly it will be obvious, and an easy fix for you. After all you've been through, you deserve it. Good luck.

J-Bird

'95.5 T, SR5, Bone stock w/32x11.50's
'06 Sonata LX