[s-cars] Master cylinder help (long)

[Douglas Fifield]

Has the booster been checked?  A failed booster might cause these problems.

D.

On Mon, Jul 25, 2011 at 12:16 PM, serge <s6serge at verizon.net> wrote:
> Hi everybody, its been a long time since my last post. My S6 avant came to
> an abrupt demise via a Japanese sh!tbox-- the cell-phone-clutching, upstate
> New York lady came down to the big city to blow through a red light and take
> out my driver's side front (enough for the Gecko to say its a total loss). I
> had a car full of people, an no one was hurt. These cars are truly tanks.
>
> But this is a tale of hope and resurrection. The car sat at my mechanic's
> for less than a week, and a young lad from the neighborhood decided he
> wanted to fix it up. I had a few parts need for the fix (along with all RS2
> bits) Rossato-Binned in my basement, so a deal was struck. A few months, 2
> new headlights, and a whole lot of elbow grease later, the car was back on
> the road! Looked damn good too!
>
> But trouble was brewing in the braking department. A pulsating pedal that
> neither I or my mechanic could track down (tried new bomb or 5, new pump,
> new hose, flushed the system 5 times... pulsation is still there, worse
> during summer months--high humidity--less so in winter, has been the only
> clue) had gotten so bad, that the car is now parked (also coincided with the
> failure of power steering hose, which has been sent to Spokane House of
> Hose), and the fluid reservoir caming off the master cylinder, spilling all
> the brake fluid...I'm surprised lightning didn't hit it twice just then.
>
> So my young friend is desperately trying to get the car back together in
> time for his FIRST S//Fest attendance. But brake system frustrations, and
> lack of sleep (and funds) due to a brand new baby, have him seeking
> desperate measures. He's considering converting to vacuum assist for the
> brakes ala non-turbo 100. Not being a big fan of vacuum assist on turbo cars
> (I know its been done), I'm trying to convince him to try a new (different)
> master cylinder first.
>
> That's where you guys come in. I'm looking for:
> 1) any thoughts on brake-pulsating problem
> 2) anyone who has a good-known master cylinder in their Rossato-Bin, or
> knowledge of where one can be sourced cheaply (dealer price is something
> like $600 + the new baby)...
>
> As always-- TIA,
>
> -Serge
>
> '03 S8
>
>
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-- 
Douglas in MN
95.5 Audi S//6 Avant
08 Prius Touring (50 mpg reg)
73 BMW R60/5 mit Toaster Tank
82 BMW R100S mit Russkie Sidecar