This is how the motor looks in your BMW z4 car.
check fig
Two relatively common issues with the Z4 tops is that the hydraulic fluid for the main top motor (the one that does the work after the header is unlatched) gets low. The other is that the main motor gets water trapped inside the plastic housing whcih causes the motor to fail. There's an updated housing that is supposedly more waterproof than the current housing, but if the failure is due to water ingress, then you'll also have to replace the top motor. If it's just low on fluid, you just fill it and it'll be good. There's a clear plastic reservoir for the fluid that'll show you if it's low.It's visible behind the left trunk carpet liner (which is also the area where the motor is located).
The reservoir is attached to the motor. It is down insid ethe body cavity where the top pivots on the body on the drivers side. To get to it you pretty much have to remove the complete top.
To remove the top manually please click on the above link
http://www.z4-forum.com/forum/viewtopic.php?f=32&t=11274
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To remove motor manually please click on the above link
http://www.z4-forum.com/forum/viewtopic.php?f=32&t=10190
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I think that you may have solved my little problem, although taking off that soft top looks like a bit of a chore. Here is what I understand.
1. the roof must come off to get any access to the motor at all. even if all you have to do is add hydraulic fluid the soft top must come off. Is this correct?
2. Great job on laying out how to dismantle the hydraulic motor. Do you have any photos or any other tips for the removal of the soft top. It seemed a wee vague in your explanation regarding the removal of the pump.
Thanks Bill Walker
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If you can give me your e-mail address I can send it to you since FixYa limits post to 150k
however, you you mean the top won't go up automatically do you mean by touching the up button once
typically this is a result of a barking brake switch issue
Sean
Hello: What the heck is a barking brake issue????
sorry,,, fat fingers
Parking brake issues
Mine getsstuck in retraced mode. You can har the motor trying to move the top but nothing happpens, then it pops loose on it's own. I think this is the retrack latching mechanism holding the top down. May needs some lubricant or adjustment.
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I'm sorry to say that it sounds like your motor on the hood has packed up, this is usually due to water ingress and is not easy to repair. There are some drain holes in the area of the motor and these tend to clog with dirt etc this results in the motor getting wet and results in the problem you have explained I have had the same problem with my Z4 and this was fixed by BMW as apparently they have to re-align the roof although there are several forums with people who have done it themselves and report it take about 5 hours
There is a manual release in the boot that will allow you to move the roof up and down. If you open the boot and look along the top edge you will see a red tab. Pull this out 5mm and twist so it doesn
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