2. BRAKING SYSTEM 2.3 TRAILER BRAKING SYSTEM TRAILER BRAKING VALVE (2-WAY) b a 42 41 1 DIAGRAM 3 41 42 2 P2 (bar) Pressione di mandata 8 9 6 7 2 5 1 3 4 1 2 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 P41/P42 (bar) D000 4760 Pressione idraulico di comando a. Parking brake actuating lever b. Bleed screw Port 1 - From compressed air reservoir Port 2 - To trailer brake Port 41 - From left brake Port 42 - From right brake 10-30 2 42) P42= f (P41, 1) P42= f ( 42) P 42= f (P4