2. BRAKING SYSTEM 2.3 TRAILER BRAKING SYSTEM % * - HYDRAULIC DIAGRAM % * + - FUNCTION Port P - Valve feed Port N - To lubrication line Port B - To trailer brake Port T - Drain Port Y - Connection to tractor braking system TECHNICAL DATA Maximum pressure at port N: 210 bar (3046 psi) Minimum constant pressure at port B:: 12.5 ± 2 bar (181.3 ± 29 psi) Maximum pressure at port B: 135 5 bar (1957.5 72.5 psi) Feed flow rate: 20–80 /min (5.3 -- 21.14 US.gpm) 0 -- 0 -- 10-23 +