[s-cars] Master cylinder help -

[chris chambers]

Gentz,
 
I am wondering if we are overlooking the fact that the "pulsating" appeared after the car was hit? 
Could the cause of this problem be a kinked or damaged line restricting the flow of the hydraulic fluid?
 
just thinking
Chris
 

From: serge <s6serge at verizon.net>
>To: Tom Green <trgreen at comcast.net>; s-car list <s-car-list at audifans.com>
>Sent: Monday, July 25, 2011 6:54 PM
>Subject: Re: [s-cars] Master cylinder help
>
>Ok, in re-reading my post I see Tom¹s point, and a couple of you emailed
>with comments about rotors... So let me try to add some
>details/clarification.
>
>While driving the car, brake pedal pulsates when brakes are applied. It is a
>pulsation, not a vibration. The pulsation is not felt through the steering
>wheel. Additionally, the pulsation is not a vibration, as associated have
>with an out-of-round or out-of-balance wheel/rotor/tire type situation. It
>is as though you can feel the hydraulic pump pumping, when you depress the
>pedal. Its been q while now, and I¹m not 100%on this, but I don¹t believe
>the pulsation was there if the car was stationary, so no pulse if the car is
>idling, and the brake pedal is applied...
>
>Thanks for all the help so far, keep the suggestions coming.
>
>-Serge
>
>
>On 7/25/11 5:10 PM, "Tom Green" <trgreen at comcast.net> wrote:
>
>> I don't believe I would start with the brake master cylinder, especially if I
>> wanted to
>> conserve resources.
>> 
>> One immediate problem is that this lengthy post has provided very little hard
>> information about the problem.  You have some definite idea just what this
>> pulsating brake pedal problem is, but you have provided the list with very
>> little
>> solid information.
>> 
>> Does the brake pedal pulse only when the pedal is depressed?  Does the vehicle
>> have to be in motion and the pedal pulses while it is braking to a stop?  Or,
>> does
>> the pedal pulse when the car is stopped?  But the engine must be running?
>> When 
>> the vehicle is in motion and is being braked to a stop, do the braking action
>> on the 
>> car pulse as well, or is it just felt in the pedal?  Does the passenger feel
>> the braking 
>> action pulsing also?
>> 
>> I am not certain by any means that such answers will help solve the problem,
>> but 
>> it is a start if it includes any other abnormal operation of the brakes.
>> 
>> There are several individuals parting UrS vehicles and announcing it on the
>> UrS cars forum on Quattroworld.com.  That should be a source for inexpensive
>> parts.  
>> 
>> Tom '95 S6  
>>          '95.5 S6 avant
>> Knoxville, TN
>> 
>> 
>> On Monday July 25, 2011, at 1:16 PM,  Serge Filanovsky <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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