Have a different angle I have seen twice on brakes. The metallurgy is suspect, lemme 'splain.
Had a Nissan pickup and had clutch chatter from day one. The metallurgy was not consistent on the face of the fly wheel, fly wheel replaced all good.
Recently I pulled the front brakes off my girlfriends 2002 Camry due to *violent* shaking when the brakes were applied. I expected to see significant warpage, there was none. Upon looking at the driver side rotor, you could see on the inside of the rotor where the pads were grabbing and letting go (Getting 'stuck'). Not 'sliding' properly. There were blake marks on the rotor where it was chattering. Had the rotor turned and all is good, it ground off the bad areas.
So, it was not due to warpage but metallurgy inconsistencies on the brake pads would not slide (grip) progressively.
My $0.02.
-Jay.