4) PARKING BRAKE OPERATED PARKING BRAKE OPERATED 19 Front P1 T1 A1 P2 T2 A2 20 40 A B P 16 17 16 Rear Parking brake switch 15 S2 B2 B1 S1 S3 18 G1 PS Parking Return line 18 18 P B3 41 T/M PS G2 PS PS Parking brake solenoid 22 23 24 2 29 30 P B B A A D Return line 25 B T Main pump 21 L S 740F4BS05 When the parking brake switch is pressed B position, the solenoid valve is deenergized and the valve open the drain port. At the same time, the hydraulic oil in the parking brake return to the tank through the solenoid valve. When the piston rod is returned by the force of the spring, the parking brake is applied. 4-7 26 26