Winter operation 221 Make sure that you observe the correct order when disconnecting the hose couplings. ! After disconnecting the compressed-air lines, ensure that the covers of the coupling heads on the vehicle are closed. If the cov- ers are not closed, the coupling heads may become contaminated, causing a malfunc- tion. X Disconnect the power supply from 12 V = or 24 V A socket. Driving mode Example: connections for trailer : Brake line hose coupling (yellow) ; Reservoir line hose coupling (red) = Power socket, 12 V ? ABS socket, 7-pin A Socket, 24 V X Disconnect the control cable from ABS socket ? . X Apply the parking brake of the towing vehi- cle ( Y page 166).
X Chock the trailer wheels. X Apply the trailer's parking brake, see the manufacturer's operating instructions. Connecting cables and compressed-air lines X Detach reservoir line coupling head ; (red). X Connect the power supply to 12 V = or 24 V A socket. X Detach brake line coupling head : (yel- low). X Connect the control cable to ABS socket ? . X Connect brake line coupling head : (yel- low). Winter operation X Connect supply line coupling head ; (red). X After connecting the compressed-air lines to the vehicle, adjust the brake pressure regulator (if installed) on the trailer (see manufacturer's operating instructions).
Important safety notes Driving in winter G WARNING If you activate the continuous brake or shift to a lower gear on a slippery road surface in order to increase the engine's braking effect, the drive wheels may lose traction. There is an increased risk of skidding and an accident. Do not activate the continuous brake and do not shift to a lower gear in order to increase the engine's braking effect on a slippery road surface. X Check that the lighting system on the trac- tor vehicle and trailer is clean and working correctly. X Check that the trailer brake system is work- ing correctly.
Disconnecting cables and compressed- air lines G WARNING If you disconnect the hose couplings in the wrong order, the trailer brake is released and the trailer could roll away. There is a risk of accident. Z