Tom,
Lubricating the front pins will help... However, keep in mind what others have said in this thread, you need to address a regular maintenance program that includes flush/refill of brake fluid, condition of brake lines and cleaning/lubricating the front and rear brakes.
If you are having a lock-up problem, you also need to check the condition of rotors/hub bearings/seals and calipers. These inspections should be done by an experienced heavy duty mechanic.
Karl