I guess ALL the manufacturers are wrong.
Why have a proportioning valve at all ?
So it evens out the pressure from the front
to the rear.
Hydraulics,
Closest to the first point of contact.

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Yes
If not it will always hit fronts first.
Since they are the closest to the M/C

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What? Someone has no idea about hydraulics here.

No, in an all drum setup you do not need a proportioning valve.

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