Mercedes-Benz Atego Manual page 108

Towing
Connect compressed air supply line of towing ve-
hicle (red coupling head) to tire inflation
connection 3 or to front coupling head.
A reservoir pressure of 10 bar is required.
!
When filling directly at four-circuit protection
valve: Test connection 22 for rear axle brake
circuit, test connection 21 for front axle brake
circuit.
On vehicles with continuous brake systems, note
that the brake force at the towed vehicle may be
relatively high/low depending on the vehicle
load and the type of brake system.
Install a manual brake force regulator if
necessary.
A reservoir pressure of 8.5 bar is required.
If the spring-loaded parking brake cannot be reliably released pneumatically, release it mechanically,
see page 83.
106
Guidelines for Breakdown Services (Subject to technical modifications)
i