In Warmtoast's NZ pictures there are examples of them without the brace. They are also deficient it what look like hubcaps. As a guess it could be part of the old 'Maxrate' anti skid braking system that used flywheels and springs to control the brake pressure.
Would be useful on a Frightener. It would prevent it from nosing over and delivering its load some distance short of the desired location.
Last edited by Fareastdriver; 1st Dec 2013 at 20:08.