Trans fluid should be done every 80k or sooner. I use Shell 134 trans fluid (MB approved), instead of the dealer supplied fluid- much cheaper, and the gasket/filter set from Europarts of San Diego. Brake fluid flush every three years or so.
Typically a long time down the road (miles) for both. I would look in your manual and see if you can find it, as it may be in the maintenance schedule. Then Mercedes Sprinter service department.
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