Check the brake cylinders, One of them is bad. I know you said your mech replaced the calipers but, If it is froze it pulls the other way when braking. The cyl is in the caliper that grabs the rotor. They are the hydraulic component that extends to press the brake shoes against the brake drum when the pedal is depressed. The other part that could have failed is the prop valve.
Nothing says new parts work out of the box .
Last edited by frscke1; August 06th 2017 12:09 pm.