1997 F150 4x4. I've had a pulsation primarily noticable at slow speeds coming up to a stop. I figured warped rotors on the front. Went ahead and replaced the rotors and brakes and still had the pulsation. Tried stopping with just the parking brake and the rear drums is where I'am getting the pulsation from. Any ideas of where to start on the rear? Are my drums out of round? Do they need replacing or can they be resurfaced? Thanks for any input.

 

There's no real way to tell unless the shoes hit metal to metal to see whether the drums need replacing without measuring with a drum micrometer. Otterzone oughta be able to measure them for you though. Assuming there's enough metal on the drums and they aren't far out of round enough to where they'd be at discard spec after turning, just resurfacing the drums should be all you need.