bracket off a bracket, double nutted, farmer fix, no telling how it evolved, I could see someone thinking they could improve braking/ reduce foot power required of mechanical brakes, by rigging something up, but with mechanical brakes there isn't any 'hydraulics' to vac
hydraulics didn't happen until about 36 - if you think you can make it work [safely] it could be an interesting historical feature, but I wouldn't call it a 'hydrovac', because it's nothing like one
Bill
