Brakes are a necessity you have to be sure that when you need to stop. If your truck is pulling when you applied the brakes, there is something wrong.
There are many factors which can affect the braking system. Drums/Shoes, Rotors/Pads, Slack Adjustment and brake campers, tire thread and tire psi, tire rods and tire king pins. Foundation hardware and alignment, brake valves and pressure mix matched parts and etc.
Its takes a trained eye to be able to pick on these issues before its too late. Let a trained professional check your braking system.