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  • 1 Post By Timinator

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Old 02-20-2021, 07:23 AM
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Default wilwood proportion valve

The car is on the lift so no street testing. Which way to turn to allow more to rear brakes. 4 wheel disk. Thanks
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Old 02-20-2021, 09:06 AM
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Perhaps this link will help: Wilwood

There are many Wilwood valves. This one says the valve is plumbed into the line to the rear brakes. Turning the knob in the direction of the arrow on the knob will DECREASE pressure to the rear brakes.
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Old 02-20-2021, 12:41 PM
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Thanks , that what i needed to know for sure.
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Old 02-20-2021, 05:25 PM
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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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Old 02-21-2021, 07:04 AM
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thanks will do this.
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Old 02-21-2021, 10:17 AM
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Quote:
Originally Posted by Timinator View Post
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.
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
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Last edited by cycleguy55; 02-21-2021 at 10:19 AM..
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Old 02-21-2021, 11:42 AM
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Just going by the dial proportioning valves in the racecars I've owned. These Wilwood ones could be different, especially if they're just on the rear brakes, but all the Wilwood proportioning dials I've used on racecars were front and back biasing, not just back. If this dial is just for the back brakes, then, yep please disregard.
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Old 02-21-2021, 12:02 PM
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Move the bar to the side you want to increase pressure.
The 1/8" side play at the clevises is ESSENTIAL. Masters will not stroke right without out. I know ALL about this, chased a soft pedal for 3 years and 2 masters diagnosed as bad by two different mechanics. One of whom put it back together without the side play. Go to 1:10

https://www.youtube.com/watch?v=ZYK4VEOae6w

https://www.youtube.com/watch?v=NzIMlPEdtD0

EDIT: This is not Gary's setup. This applies to Wilwood pedal box with dual masters and balance bar.

Last edited by MKS427; 02-21-2021 at 12:22 PM..
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