Like every year Fatandre is back

[Fatandre]

Ok guys. Always something to do.

Started the car after 6 months away as I have become a father and have other priorities Car started like always but a huge pentosin puddle under the car.

Untitled by andres petur, on Flickr
Untitled by andres petur, on Flickr
Untitled by andres petur, on Flickr
Untitled by andres petur, on Flickr

[LappingLuke]

Yeah buddy. We knew what we signed up for when we signed the title!

[dragon850]

Probably brake booster seal let go!

[shogun]

copied from Pusches parts under tech info and translated:

power steering fluid under the E31 after a long time parking does not always indicate a defect.
It happens again and again that under the E31 after longer standstill/parking a pool of oil from the brake and steering circuit (Pentosin) has formed under the car.
This does not have to be a leak. In most cases, too much Pentosin was filled into the reservoir, or the fill quantity was not determined correctly.
Checking the oil level for brake and steering hydraulics (extract from the 8-series operating manual)
- With engine stopped, loosen knurled nut and remove reservoir cap.
- Depress brake pedal several times until oil level no longer rises or until resistance is felt when braking. (approx. 10 actuations).
- Check the oil level: It must be approx. 20 mm below the upper edge of the oil tank/of the reservoir.
- Correct the oil level if necessary. Be sure to use Pentosin CHF 11 S
- Replace the reservoir cap and tighten the knurled nut. Make sure that the cover is correctly seated.

There are, of course, two sides to the pentosin under the E31.

One is, as already mentioned, a simple overfilling problem and easy to solve. The second is a bit more profound.
The pressure regulator can no longer hold the accumulator pressure (up to 100Bar) and is discharging.
This means that the pentosin flows back into the tank. As long as this happens very slowly (month / week) it is not a serious problem. However, if the pedal is hard again every time before starting (on the same day), it becomes a safety problem because the brake is no longer fully supported. Then the pressure regulator has to be replaced. (Problem is, there are no more ...)

Therefore my TIP to relieve the pressure accumulator and the pressure regulator before longer standstills: 10 x brake pedal to relieve the pressure accumulator, pressure regulator and all associated lines and seals.

https://www.pusches.de/index.php/tec...erer-standzeit

[Fatandre]

Thanks for the info Shogun.
Will look into it all soon.