race911

993 355 053 50, the hydraulic pump is leaking between the electric motor and the cast pump housing from the seal becoming deformed. Anyone ever had to replace this seal? Can't measure it right now as I've got the car at home. No separate part number listed because they'd just love to sell you a mega $$$$ complete unit.

Now, why did the seal deform? Only thing I can think is that the pump overheated. Not out of the question as I completely flushed the fluid last month for a track day. I did notice the pump cycling quite a bit just after that, but didn't think anything of it as I abused the one in my '92 C4 for 3 years of hard track duty........running it out of fluid, etc., and it took it all just fine.

chris walrod

Post an image, I may be able to source a seal for you.

race911

Thanks! But I think I've got it covered via my friend with the BMW shop up here.

For anyone interested, the seal is 1.5mm wide X 3mm high X 53mm I.D. But the I.D. measurement is iffy since the seal was deformed. Max O.D. from measuring the pump housing appears to be 58mm.