EBS braking system for buses with no attachment (4S/4M system) 9 10 8 11 1 2 12 13 6 7 3 4 14 5 Legend: EBS components: Other components: 2 Brake signal transmitter 1 EBS central module 8 Compressor 9 Air dryer 3 Proportional relay valve 10 Four-circuit protection valve 4 ABS solenoid valve 11 Air reservoir 5 Axle modulator 12 Hand brake valve 6 3/2 relay valve 13 Relay valve FBA 7 ABS sensors 14 Brake cylinder System structure in buses 2. EBS 4