V normalnih pogojih zaviranja, kot je rahlo ali zmerno zaviranje, ostane proporcionalni ventil odprt, da zagotovi enak hidravlični tlak za sprednje in zadnje zavore. To je zato, ker rahlo zaviranje ne omogoča prenosa dovolj teže z zadnjega na sprednji del vozila, kar pomeni, da ni verjetno, da bi prišlo do blokiranja zadnjega kolesa.
When the hydraulic pressure exceeds the minimum level or "diversion point", the brake proportional valve only works under severe braking conditions. In this case, the piston connected to the rear brake circuit forces the valve to close, limiting the hydraulic pressure from the rear brake to 20-40 percent . This allows the front brake to have a higher hydraulic pressure than the rear brake, thereby preventing the vehicle from slipping during an emergency stop.
Po sprostitvi zavornega pedala vzmet potisne bat, ki blokira ventil, na eno stran, tako da hidravlično olje enakomerno prehaja skozi sprednje in zadnje zavore.
