Jump-starting, tow-starting and towing away 335 Towing away vehicles with transmission, transfer case or axle damage Releasing the spring-loaded parking brake cylinders manually ! Undo the release bolt with a maximum torque of 70 Nm. Do not use an impact wrench. You could otherwise damage the spring-loaded parking brake cylinder. X Remove the propeller shafts leading to the driven axles. or X Load the vehicle onto the low-loader. X Use chocks to safeguard the vehicle against rolling away. Towing away a vehicle while the engine is running X Remove cover = of left and right-hand side spring-loaded parking brake cylinder ? . X Shift the transmission to neutral.
Towing away a vehicle with operational gearshift Towing speed up to a maximum of 40 km/h. X Unscrew release screw ; on left and right- hand side spring-loaded parking brake cyl- inder ? (release position), until control pin : is fully extended. X Shift the transmission to neutral. X Start the engine. Returning the spring-loaded parking brake cylinders to the operational condi- tion Breakdown assistance Releasing the spring-loaded parking brake cylinders X Make sure that the J warning lamp in the instrument cluster is not lit. The vehicle's compressed air system has sufficient reservoir pressure.
In an emergency, the spring-loaded parking brake cylinders can be released manually for towing if there is insufficient reservoir pres- sure in the brake system. Before using the vehicle again, the spring-loaded cylinders for the parking brake must be made operational again. General notes X Release the parking brake ( Y page 166). X Screw in and tighten release screw ; of left and right-hand side spring-loaded park- ing brake cylinder ? (brake position). Tightening torque 40 to 50 Nm. Control pin : is fully retracted. X Press cover = onto the left and right-hand side spring-loaded parking brake cylinders. U 216 / U 218 / U 318 Overview Z