I've got to chime in here. Bear in mind that I have no answer. It seems reasonable to try different pads as suggested -- that's a relatively inexpensive experiment to try.
My wheel assembly spins similar to yours. That's either good for you or bad for me. I haven't had any problems with my front disc conversion though it is the Granada flavor and not the SSBC flavor.
This may be more for a point of discussion rather than a concrete answer. I'm not sure I agree that *not* being able to lock up the wheels is good. It is true that locking the wheels up leaves one with no control. However, here is my thinking as it pertains to cars without antilock brakes.
-- If we reasonably assume that maximal braking occurs just prior to lockup, then it seems reasonable to say that a braking system is performing well enough when it would get to this point. It need not exceed this point, but it must be able to get to this point.
-- If your wheels do not lock up, how would you know you had maximal braking? I mean, let's just say you took some runs and measured distance to stop. Then, say you could make some adjustment such that the calipers pinched the rotor just a little more and then repeated the test. At some point, the distance to stop would be minimal. Crossing this threshold would result in a locked wheel. It seems that you would only know the "position" of the threshold if you could slightly exceed it. Otherwise, you'd have no clue as to the braking ability that you are not utilizing.
Maybe I'm nuts, but I like knowing that I can lock up the wheels if necessary. In my Granada conversion, I can. As the driver of a car without antilock brakes, it's up to me to regulate them to not lock up in a panic situation. If my car were physically unable to lock up the wheels, I'd think something was wrong and my braking distance might be longer than it need be.
Just my thoughts,
Jerry
