I have a 2000 K3500, was purchased as cab/chasssis. The steering box replaced, now when I step hard on brakes, the Left Front brake locks up first. have tried bleeding system but still get bubbles in the power steering fluid, no leaks noted in the hydro system under the hood. Is there a proper bleeding or other procedure to even brakes, or as it is prob original hydro, just get another? Thanks in advance.