That's not as easy as it sounds. The master cylinder pipes outlets only go to the ABS unit and the ABS unit feeds the front and rear.
AFAIK the outlet nearest to the servo is the primary circuit (front). However, I don't think there is any balancing or pressure reduction function in the master cylinder. That is taken care of by valves in or on the ABS unit.
AFAIK the outlet nearest to the servo is the primary circuit (front). However, I don't think there is any balancing or pressure reduction function in the master cylinder. That is taken care of by valves in or on the ABS unit.