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355.2 in the WKA 2015 Rulebook.
“Dual brake systems are composed of two redundant and independent sets of components including master cylinders and calipers.”
That means, you need to have two separate master cylinders and at least two separate calipers.
Your system does not fall under that. If you had a second rear caliper on the brake disc, with the second master cylinder going to that, it would be legal.
David Cole - EKN Managing Editor