2) SERVICE BRAKE OPERATED SERVICE BRAKE OPERATED 19 Front P1 A1 P2 T1 20 40 T2 A2 Rear 16 17 16 S2 B2 B1 S1 S3 G1 18 PS B3 Parking T/M Return line 18 18 PS G2 PS 41 22 23 24 2 29 P 30 A D Return line 25 T B B A 21 B Main pump L S 740F4BS03 When the pedal of brake valve (19) is depressed, the operating force overcomes the force of the spring, and is transmitted to the spool. When the spool moves down, the inlet port is opened, and at the same time the hydraulic oil controlled the pressure level by the cut-off valve (15) enters the piston in the front and rear axles. Therefore, the service brake is applied. 4-5 P PS 26 26