BBlue wrote:
Tom, I read sections of the book years ago. As I recall, he described three types of valves, constant percent reduction, pressure limiting and the type you describe. Wilwood describes their valve as giving up to 60% reduction of pressure. That's all. To me, that sounds like a constant reduction valve, the least desirable type. I suppose we will never know, unless some curious soul sets up a test rig, measuring input and out pit pressures across a wide range of pressure.
Bill, here's Tilton's explanation. It's consistent with Puhn's text:
Hmm, for some reason I can't copy/paste the url. but if you go to Tiltonracing.com, under the Technical tab, click on Installation Instructions, and under Brake Accessories you'll find a line item for Brake Proportioning Valve that will bring up a pdf.
Hope that helps.