Brakes??????

Got a 01 peterbilt 387 with steer axle issues. When brakes are applied the truck pulls hard to the left (driver side stopping harder). I have replaced the quick release valve, abs modules, brake chambers, slack adjusters, drums, shoes. There is no wheel seal leakage and both sides are getting air because the right side is still wearing on the shoes just not as much. I am at a lose and have no clue what else could possibly be going on. Tia for any help!

 

I havent checked application pressure yet how would u recommend doing that? I would assume remove air line off the brake chamber and put a pressure gage in place of the chamber? And also everything is identical side to side with all new matching parts and problem goes away when air pressure is taken away from steer axle. If i stand on the brakes full pressure both brake chamber mounting brackets have the same i guess you would say deflection (the bracket bending a small amount from the pressure the brake chamber is applying) and they have the same throw and reaction time.

 

Ok i checked the pressures at the brake chamber and they match with the gage in the dash when the brakes are applied. I am putting a foot valve in it tomorrow (only 60$ so figured why not). After that the only thing in the whole system left will be the s cams. Which that got me thinking is it possible the scams could have a slight different pitch causing almost a gear type effect to change application pressure?

 

For anybody interested it turned out to be the foot valve causing the issue thanks for the help lester