The three vacuum-actuated diff locks are the single most-requested video in every G auction, and they frequently fail to engage because they were never used or serviced, letting lines clog. Buyers are coached that pressing the switch is not proof: the red indicator lights above each switch must illuminate, and restoring a seized system (vacuum pump, check valves, actuator cylinders) is expensive and time-consuming.
Triple locking differentials: verifying operation and vacuum-system repair
Mercedes-Benz G-Class (W463 1990-2018) · mechanical