bad vibration when braking

If the rears are warped, you will feel the vibes in the seat, if it's front rotors you feel it in the column and pedal.

I feel the vibration in the pedal, seat, wheel and the whole truck shakes. when i got the fronts turned i also rotated the tires and felt no difference. The tires have 50,000 on them. i can get the back rotors turned but they are only a couple months old also. Is it normal for the rears to warp and the fronts not?

with 93,000 miles I would go thru the suspension the engine and tranny mounts steering parts and brake hydraulics for signs of locking up. any rotors turning blue? small hard spots on the surfaces? uneven pad wear?

I dont notice any hard spots or discoloration on the brake parts, i looked ofer all of the suspension mounts and nothing looked weird or out of place. Im getting the rear rotors turned now and if i dont get any results from that should i consider tie rods or the tires themselves? Could an out-of-balance tire cause vibration during braking? Also, all of the pads are wearing evenly. Whats your opinion?

Also, I mainly feel the vrbraton braking fron 50-40mph, after than, i feel it mainly in the pedal.