The power steering reservoir tends to leak up top because of two main reasons.
- The reservoir is made out of plastic and there is a crack where the two halves come together.
- The reservoir cap gasket has deteriorated, lost its elasticity, etc. I have heard the gasket is not compatible with the Pentosin hydraulic fluid and the gasket deteriorates over time.
Below is a picture of what the power steering reservoir looks like in almost all modern BMWs.
power steering fluid after '06 with their E9X models. The Pentosin fluid is not compatible with ATF! Do not mix the two. The required fluid is stamped on the top of the reservoir cap as shown below.
To replace the power steering reservoir:
- Remove the cap and suck out all the power steering fluid using a turkey baster
- Remove the two nuts and bolts holding the power steering reservoir in place
- Break the two clamps holding securing the hoses to the reservoir at the bottom.
- Part number for clamps: 07-12-9-952-109
- Part number for hoses built after 09/01: 32-11-6-750-155 and 32-41-6-796-390
- Part number for hoses built before 09/01: 32-41-1-095-526 and 32-41-6-796-390
- Installation is the reverse of removal. Install the clamp and install the two nuts and bolts securing the power steering pump reservoir. Fill the reservoir with the appropriate steering fluid up to the max fill line.
. If your reservoir requires Pentosin I would keep your old cap and put it on the new reservoir. To replace the power steering reservoir cap gasket:
- Remove the cap
- Remove gasket by using a scribe, pick, or small screwdriver. Be careful not to damage the cap
- Lube the new gasket with the hydraulic fluid and place into cap
- Install cap
- Below is a picture of where the gasket is located and the fill lines on the cap
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