I talked to the guy that developed it some years ago, when I was building Warhammer. My understanding of this items was that it was a type of surge suppressor. I never ended up running one so I can;t help there.

Seems the items is at http://www.larsenracingproducts.com/brakes-calipers-supporting-and-replacement-parts/

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.