Last year I replaced the brake shoes myself on the rear brakes. I believe I adjusted the star wheel right when I put the drums back on. Adjusted it enough where the shows just rub a bit against the drums but you can spin the drums freely. Whenever there is moisture or it rains and is wet out and the truck sits overnight or longer and you go to drive it and just barely tap the brake pedal the rear brakes lock up quick and will put you to a jerky stop quick. This was happening even with the old brake shoes. Any ideas as to why it does this? Do the drums need to be replaced?