truck chatters when i hit the brakes

I recently changed the drums on 2002 Tacoma and once I did, the truck started jumping around when I hit the brakes. It gets a lot worse when I try and downshift. To me it sounds like its not going all the way out of gear or something but I can hear a metallic racking sound when I push the clutch in. sorry if I don't have a better description than that its kind of hard to describe.

 

could be warped rotors in the front of your truck.
jumping around?
not getting all the way out of gear- maybe the rod of your pedal is bending, I've had that problem, could be issue with master cylinder, could be out of fluid, or could be a loose throwout bearing in your tranny.
but these sound like two separate issues. hard to help without better description or actually hearing it.