4) 4) PARKING BRAKE OPERATED PARKING BRAKE OPERATED 19 Front P1 T1 A1 P2 A2 20 40 A T2 P B Rear 16 17 16 Parking brake switch 15 S2 B2 B1 S1 S3 18 G1 PS P B3 Parking T/M Return line 18 18 PS G2 PS PS 41 Parking brake solenoid 22 23 24 2 29 30 P A A D Return line 25 B T B B 21 Main pump L S 760F4BS05 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