since i've redone my hj45 brakes, i've noticed that my pedal on the 76 fj40 is solid as without the retardation you'd expect for the force put in. i also notice the pedal drop i notice on the hj at startup is absent from the fj, is this a booster problem. how do i trouble shoot this. could it just be lack of vacume, or a shot booster, or am i out of my tree?