1-19. BRAKE SYSTEM (CONT)
Figure 1-24. Brake System (Cont)
(4) The SYSTEM PARK control (7) vents air pressure from the primary brake circuit and
applies the rear spring brakes.
(5) The TRAILER AIR SUPPLY control (8) supplies brake air pressure to a towed
vehicle or trailer.
(6) SERVICE gladhand (9) and EMERGENCY gladhand (10) provide the necessary
connections to supply a towed vehicle or trailer with brake air pressure.