Simple proportioning valve question..

usually screwing the knob in will reduce the flow to whichever side of the brakes you installed the valve on.

I think the noise you are hearing is unrelated to the proportioning of the brakes.

are you sure your pads are in right? did you use brake cleaner on the rotors?

yeah, what he said. Moaning shouldn't be related to the prop valve. Something else is wrong, and if you can feel is, I think you need to go back and check everything on the brakes again. Ensure everything is properly tightened and aligned.

The prop valve, if installed correctly should only affect your rear brakes. To properly adjust, conduct hard stops on a dry surface until your rear brakes lock up first. Then, back them off so that they are just under the threshold of locking up first. In other words, when set correctly you want the front brakes to lock first, never the rears, but you want the rears to do as much work as they can without locking up. If the rears lock first in hard stoping or cornering, the rearend will try to come around on you - never a good thing.

Doing this on dry pavement is appropriate because wet pavement will not allow as much weight transfer. When the weight actually does transfer off of the rears, it will likely cause them to lock up first.

Chris