Have you bled the system. There is a bleeder on the top of the gear box. With the engine off, open the bleeder, the level of fluid will go down in the reservoir. when fluid instead of air comes from the bleeder shut it off.

The best way to get all the air is to do this a number of times or get a hose and run it from the bleeder to the reservoir. Start the engine and open the bleeder. With the end of the hose submerged the bubbles can be seem and when gone you can close the bleeder. DO NOT TURN THE WHEEL while the bleeder is open. It will blow the hose from the bleeder or the reservoir and make a mess. It might atke closing the bleeder and a couple lock to locks and then another openning of bleeder to verify.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician