Brake system upgrade kits...where can I get them?

[PredatorVI]

Hey all,

My dad has a 1979 GMC Sierra 3500 1 ton dually. He wants to tow a fairly heavy load with it (a completely different discussion) and I don't think that it's brake system is up to par considering it's condition. He is old and stubborn and will try it regardless, but I am trying to get him to redo the brake system w/ new parts and to even consider upgrading the system to bigger, better components that have higher capacities, including larger drums/rotors, higher capacity master cylinder, etc.

Does anyone know of a place that makes a kit to upgrade the braking components for this year/model truck? I have found some online, but they are only for the 1/2 ton trucks.

Thanks for any information.