TM 9-2320-365-101-19. BRAKE SYSTEM (CONT)Figure 1-14. Brake System (Cont)(4) The SYSTEM PARK control (7) vents air pressure from the primary brake circuit andapplies the rear spring brakes.(5) The TRAILER AIR SUPPLY control (8) supplies brake air pressure to a towedvehicle or trailer.(6) SERVICE gladhand (9) and EMERGENCY gladhand (10) provide the necessaryconnections to supply a towed vehicle or trailer with brake air pressure.1-46
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