2) 2) SERVICE BRAKE OPERATED (NEW) SERVICE BRAKE OPERATED (NEW) FRONT 24 BL1 25 P1 T1 BL2 BR1 45 T2 P2 BR2 REAR S3 23 G1 PS B3 46 23 G2 PS T/M PARKING T2 Return line P Return line 6 A B D L S1 B A Main pump 955SA4BS03 When the pedal of brake valve (24) 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 (20) enters the piston in the front and rear axles. Therefore, the service brake is applied. 4-5-1 21 S1 20 P 23 PS PS 38 PP T1 6 8