I have had my near stock 87, 1 ton 4x4 pickup for close to two years and it has suffered from a tendency to wander during braking. This problem is more pronounced when the brakes are hot and when I am braking from high speed. Seventy percent of the time my truck pulls to the right, twenty-five percent of the time it stops straight, and the rest of the time it pulls to the left. The harder I press the brake pedal, the stronger the truck pulls. It can take as much as a quarter turn of the steering wheel to keep the truck pointing straight. When not braking, the truck tracks straight. Additionally the brake pedal can be depressed to the floor (this problem has persisted after three master cylinders, rebuilt brakes front and rear, rebuilt ps pump, and rebuilt booster) however the brakes are powerful. Here is a list of parts/labor I have thrown at my truck since I have had it in approximate chronological order. Not all of the items listed were replaced specifically to address my braking problem, but I thought that they were worth noting. No significant changes occurred after any of this work: 1. New front rotors, performance friction pads, rebuilt calipers 2. Rebuilt brake master cylinder 3. Rebuilt hydro booster 4. New proportioning valve (I did hold pin in during bleeding) 5. New brake master cylinder 6. New tires (and many subsequent rotations) 7. New RS9000 shocks 8. New Tie rod and pitman arm ends, steering damper, and alignment 9. Measured pad thickness/wear side to side after 10k miles use. Difference of less than 0.010". 10. Swapped pads side-to-side 11. Had local shop measure line pressures at each front caliper. Measured same side to side (getting really pissed at truck by this point) 12. Had local shop rebuild rear brakes. (Turned drums, new shoes, new wheel cylinders, new springs/hardware) 13. Very careful inspection of hard lines, spring bushings, frame around steering box... 14. New u-bolts and cleaning of area around axle/spring interface. Centering bolts and corresponding slots looked ok. (Note: Each of the four times I have torqued these nuts/bolts the suspension makes popping noises for a few hours under braking while driving. Two to three nuts went approx. 1/4 turn to reach spec each time ) 15. Begged to ColoradoK5 for help If anyone has any ideas or knows someone that might be able to help me, please let me know. I really want to like me rig, but she is being quite difficult.