3) PARKING BRAKE RELEASED PARKING BRAKE RELEASED 19 Front P1 A1 P2 T1 20 40 A T2 A2 B Rear P 16 17 16 Parking brake switch S2 B2 B1 S1 S3 15 G1 18 PS P B3 Parking T/M Return line PS G2 PS PS 18 41 18 Parking brake solenoid 22 23 24 2 29 P 30 A D Return line 25 T B B A 21 B Main pump L S 740F4BS04 When the parking brake switch is pressed A position, the solenoid valve is energized and the hydraulic oil controlled the pressure level by the cut-off valve enters the parking brake. It overcomes the force of the spring and pushes the piston rod. This releases the brake.
Therefore, the hydraulic oil pressure is applied to the parking brake piston through the solenoid valve and the parking brake is kept released. 4-6 26 26