The roof motor container sadly has quite a design floor it is susceptible to back filling with water over time due to the main roof drains not being able to take the water away.
Fix z4 roof.
The hydraulic pump of your bmw z4 a pricey part that is key for the operation of your cabriolet roof system is located in an area that is not waterproof.
There is another issue that causes this motor to fail and here is what a z4 owner can do to prevent future problems.
When a pump becomes water damaged it requires replacement.
The power roof motor is on the driver s side of the z4 below the roof.
Roof motor failure is a very common issue on the e85 z4 as the roof motor resides under the roof unit frame and canvas in a plastic container.
What s more if you do not have your rear drains cleared regularly don t expect a new pump to last too long.
Cayman autos specialise in bmw z3 and bmw z4 roof repairs at cayman autos we have a high level of customer service and turnaround for quick efficient and cost effective bmw roof repairs.
All this information is in the owners manual but if you haven t got this to hand this video will help you release use the roof manually.
Here are some nice instructions with pictures.
How to replace soft top motor without removing roof.
Bmw z4 roof motor failure.