I saw an invention once which was a foot-operated brake for the back wheels of a long board. I think it had tiny drum brakes for the wheels or something like t

I saw an invention once which was a foot-operated brake for the back wheels of a long board. I think it had tiny drum brakes for the wheels or something like that. It had a big metal heat soak to absorb the heat from braking. Given I've never seen one, I guess it flopped.