Your MC maybe bad, yet if the fluid looks nasty, you should flush and
bleed the brake system.
Nasty fluid is usually caused by water in the fluid, and when left in
there it messes up the brake components.
On the vacuum boost, check the brake booster vacuum line, before
focusing on the booster itself.
Rob
'85 300D
Garden Grove, CA
==
On 9/9/12 4:54 AM, diesel_mercedes@yahoogroups.com wrote:
> Re: pedal to the metal (a sinking feeling) w126
> Posted by: "ajrnemt"ajrn@hotmail.com ajrnemt
> Date: Sat Sep 8, 2012 4:45 pm ((PDT))
>
> ...and the fluid DOES look nasty.
>
> Guess I'll order a new reservior to go with the new m.c.
>
> --- Indiesel_mercedes@yahoogroups.com, diyernh<diyernh@...> wrote:
>> >
>> > One of my "oooohhhh" moments was when I first had a failed master
>> > cylinder. I spent all sorts of time checking everything else. When I
>> > finally made it back to the master cylinder for replacement, I found
>> > black stuff floating in the reservoir. I believe it was the seals
>> > degrading and flaking off into the fluid.
>> >
>> > I hadn't really looked at the fluid. Brake fluid is quite clear. It's
>> > a pretty good telltale sign that the master cylinder is bad if it's
>> > black or murky.
>> >
>> > Carl
>> >
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