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      07-14-2020, 04:09 PM   #2
belcom
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Drives: '18 540i M-Sport, '06 Z4 3.0si
Join Date: Nov 2014
Location: Toronto

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Please don't quote me on that as I have not done the job myself however in one of the top motor threads recently someone had mentioned that the hydraulics for the top motor are self-bleeding.

I had an issue personally where the top stopped operating even though the motor was replaced. At some point in time I had just pushed the button and held it pressed for a long time. In a minute or so I started hearing the fluid rushing through the lines and the roof had activated and working since. Felt like it was a problem with air in the hydraulics.