Install the propotioning valve to the master cylinder.
Tighten the flare nuts and bleed the system.
Tightening torque
Brake tube flare nut :
13~17 Nm (130~170 kgf·cm, 9~12 lb·ft)
Proportioning valve mounting nut :
35~55 Nm (350~550 kgf·cm, 30~40 lb·ft)