Using Single or Dual Line Trailer Air Brakes (If Equipped)

causym CAUTION: Avoid possible injury from losing control of tractor equipped with AutoPowr transmission operating on downhill slopes. Tractor wheels may lock and skid on slippery downhill slopes. (See DOWNHILL OPERATION IN SLIPPERY CONDITIONS in Operating Tractor-AutoPowr Transmission section.)

Air brakes are a combined single- and dual-line system. The single-line braking system uses coupler (A). Dual-line braking system uses couplers (B and C).

NOTE: The single-line trailer brake may be used at speeds up to 25 km/h (15.5 mph) only.

Clean connections before attaching air hoses. Lift cover from trailer brake coupler and connect trailer hose coupling. Seal connections with dust caps whenever hoses are disconnected.

Start engine and allow air system to reach working pressure. While air pressure builds, Service Alert indicator light comes on and air pressure warning appears on CommandCenter display. When operating pressure is reached, indicator light and warning display shut off automatically.

RXA0068263

Brake Couplers


A-Black (Single-line)
B-Yellow (Dual-line)
C-Red (Dual-line)

OU1092A,0000356 -19-15AUG05-1/2

IMPORTANT: With trailer lines connected, do not drive tractor until operating pressure is reached and service alert light and warning display shut off.

Depress brake pedals to stop tractor-trailer while disengaging the clutch.

NOTE: Depressing the clutch to stop tractor equipped with AutoPowr transmission is not necessary. See STOPPING AND PARKING THE TRACTOR in Operating Tractor-AutoPowr Transmission.

IMPORTANT: Reduce brake wear:

  • Make sure the pressure hoses are connected.

  • Select the same gear for both downhill and uphill driving.

  • Check the air brake on the trailer regularly for correct functioning.

OU1092A,0000356 -19-15AUG05-2/2