Quote:
Originally Posted by Timinator
You can actually get "close" in the adjustment by having someone sit in the car and gently start to apply the brakes and adjust the valve while you physically turn the wheels. You want the fronts to the point where they can't be moved while you can just muscle the rears to move a little.
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That method MAY work if the pressure relationship between front and rear brakes was linear, but most proportioning valves installed in the rear brake line operate to LIMIT the rear pressure, resulting in a 'knee' in the pressure curve, seen in this diagram:
As is shown, rear brake pressure rises in a linear fashion with the front brake pressure until it reaches the 'knee', set by the control knob. After that it rises much more slowly while the front brake line pressure rises without restriction.
More:
https://www.brakes-shop.com/brakeped...tioning-valves
Wilwood adjustable proportioning valve instructions:
https://www.wilwood.com/PDF/DataSheets/ds488.pdf