Only 50K miles on your truck? If that's the case, none of the springs or the star wheel adjucter should be worn out.

Get a Haynes manual and refer back to a couple of good posts here that you have been given in reference the correct tool, Brake Spoon and the use of jack stands for your personal safety.

I normally adjust mine until the wheel gives me a medium amount of resistance. You will also feel this in brake pedal.

Tim