Originally posted by Geo:
Proportioning valves are specified as legal.

A check valve for recirculating brake fluid cannot be confused with a proportioning valve. I don't see any other way to slide the valve under the rules. It's not a line which is free. There is just no provision for it.
George,

How about if it's incorporated into the brake line? Brake lines are free, nothing says what you can or can't do w/ them.

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