This is a good one.

My 93 4x4 cummins 4500 front axle pulls both ways? I have replaced the master, calipers 3 times, front hoses,rotors,pads 2 times rear axle seals, shoes and all the fluid! All this in 3 months? It pulls hard to the right and somewhat to the left at times, it does not do it all the time???

 

Then look into all the steering components, obviously it's not the actual brakes.

 

check all your steering links and your kingpin bushings and wheel bearings