[W126 Coupe] Brake Master Cylinder

[Dick Spellman]

Josh Allen wrote:

> samsisic at comcast.net wrote:

>> Thanks Dick and Markus! Will do...

>> Not sure what you mean by "build-up" under the booster?

>> Are you talking about the cavity area between the two fire walls?

>> Build-up of leaves and debris?

>> Sam

>>  

>

> I'm not sure of this, but I thought he meant brake fluid leakage down 

> the shaft, into the booster area. I know on other vehicles that proves 

> to be a semi common failure point, when the master cylinder starts to go.

Hi Sam & Josh,

Sam, I'm referring to the cavity inside the booster enclosure not under 
the booster exterior.  The interior is visible once the master cylinder 
is removed. The build-up will be brake fluid.  Brake fluid that has 
seeped by the aging master cylinder will have pooled to a level where it 
sits on the rubber diaphragm.  This will cause the diaphragm with time 
to fail. I doubt you have this problem, but, wanted you to look in there 
just to be sure where mileage, previous owner all of that are not known.

Regards,
Dick