Leak between master cylinder and reservoir

[oscaac]

Hey All,

So I noticed a leak between the master cylinder and brake fluid reservoir on my 05 997 Carrera. I was doing a brake fluid flush which I've done a few times using a Motive power bleeder and noticed the pressure started falling even before I opened the brake caliper nipple. I finally found some brake fluid oozing out between the seals of the master cylinder and reservoir. Given the 911 is 15+ years old now, I expect this is normal.

Questions: what do I need to replace here? The seals seem to be part of the master cylinder so I assume I need to replace it? Should I replace the brake fluid reservoir as well? 

Thanks in advance. 

-Oscar

 

 

Edited April 18, 2021 by Loren
Made images viewable here

[JFP in PA]

How much pressure were you using on the Motive bleeder?

 

[oscaac]

I normally use 10-15 psi. Pumped in 10, walked away for a few minutes, came back and it was at 5. After taking off all the plastic covers, I can see the fluid slowly leak out when I slightly move the reservoir (without the power bleeder attached).

[JFP in PA]

OK, the reason I asked is that it is possible to blow out that seal if you jack the pressure up too high (I have seen people go to over 20 PSIG, which the fluid reservoir was never meant to see, and the seal fails). I would check with a dealer to see if the seal is available by itself, but I suspect it is not.

[Loren]

 

993 355 922 00  Grommet -- 2 required -- US MSRP $24.74 (not sure if that is each or for two)

 

[oscaac]

Great, thanks guys.