On Sat, 01 Aug 2015 09:31:53 -0400 Max Dillon via Mercedes
<mercedes@okiebenz.com> wrote:

> SWMBO says that she had to pump the brakes to stop the car on one
> occasion yesterday.  I'm planning to check the fluid level and look for
> leaks, but I'm suspicious of the master cylinder.

The master cylinder is the usual cause of sinking break pedal. If you can
pump the breaks up, that also points to the master cylinder.

A fellow student recently had a sinking break pedal, but his was due to a
pinhole leak in one of the flexible brake lines. That situation will
prevent pumping up much because there's no more brake fluid left.



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