Nissan Repair: brakes hopping, nissan pickup, brake pads

Question
I have a 94 nissan pickup and recently had just my drums replaced cause brake pads were still good. Now when i put on my brakes the back of my truck hops up and down any help would be great thanks    dan

Answer
Dan,

The shoes are grabbing on the new drums.  You could have grease or oil on the drums or the shoes could be contaminated and in need of replacement.  Basically, the brakes are grabbing.  One last thing is that the new drums could be out of round and that should be checked too.