300E 4MATIC (124.230) L6-3.0L (103.985) (1990)
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Remove 4MATIC control unit (N30/3) from the mount and disconnect the 25-pin coupling.
Connect the 25-pin cable harness with the test cable (02) to the socket box (04). The 4MATIC control unit (N30/3) remains disconnected (unplugged).
3 Actuate the rear axle differential lock valve (A7/2y3) by bridging from socket 8 to socket 2 (ground) on the socket box.
Start engine and allow to idle. Service valve in operating position.
4 Open breather (67) on rear axle center piece assembly until the hydraulic oil escapes without any bubbles.
5 Bleeding multi-disk clutches of front axle drive train (AV) and center differential lock (ZS)
