[s-cars] occasional brake light on start and sometimesdifficult steering - hydraul flushing?

[chris chambers]

Wylie,

could you provide a link for me, can't seem to find it using search.

Thanks
Chris



----- Original Message ----
> From: Wylie Bean <theringmeister at triad.rr.com>
> To: chris chambers <fastscirocco_2000 at yahoo.com>; s-car-list-bounces at audifans.com; Fred Munro <munrof at sympatico.ca>; Jared Robinson <chapel976 at gmail.com>; s-car-list at audifans.com
> Sent: Thursday, June 25, 2009 11:45:31 PM
> Subject: Re: [s-cars] occasional brake light on start and sometimesdifficult steering - hydraul flushing?
> 
> Chris, I don't know if you follow Mance's antics on QW, but I'm running Mobil1 
> synthetic ATF in the hydraulic system right now along w/ pentosin.
> 
> Wylie Bean
> TheRingmeister at triad.rr.com
> 90 cq
> 91 90q20v
> 92 UrS4
> 08 Q7 3.6
> Sent on the Sprint® Now Network from my BlackBerry®
> 
> -----Original Message-----
> From: chris chambers 
> 
> Date: Thu, 25 Jun 2009 20:32:26 
> To: Fred Munro; Jared Robinson; 
> 
> Subject: Re: [s-cars] occasional brake light on start and sometimes
>     difficult steering - hydraul flushing?
> 
> 
> 
> Gentz,
> 
> is there a hydraulic fluid that can be used in place of pentosin's liquid 
> gold for flushing the system?
> Obviously after flushing fresh Pentosin would used.
> 
> 
> 
> Chris
> 
>  
> 
> 
> ----- Original Message ----
> > From: Fred Munro 
> > To: Jared Robinson ; s-car-list at audifans.com
> > Sent: Thursday, June 25, 2009 9:44:24 PM
> > Subject: Re: [s-cars] occasional brake light on start and sometimes difficult 
> steering
> > 
> > Jared;
> > 
> > The hydraulic pump has two circuits; a high volume low pressure circuit for
> > the power steering and a low volume high pressure circuit for the brake
> > assist. Both circuits are fed from the common fluid reservoir. 
> > 
> > In the power steering circuit the pump pressurizes the fluid and sends it to
> > the steering rack. Fluid from the rack goes through an oil cooler (a
> > U-shaped black steel tube mounted at the bottom of the AC condenser) and
> > back to the reservoir.
> > 
> > In the brake boost circuit the pump pressurizes the fluid and sends it to
> > the brake boost servo and to the accumulator. The accumulator stores
> > pressurized fluid so you will have brake assist if the engine stops while
> > the car is in motion. Normally the pump pressurizes the accumulator until it
> > is charged and then fluid is bypassed to the reservoir. When you apply the
> > brakes, pressurized fluid flows into the servo to give brake assist and then
> > flows back into the reservoir. When the engine is stopped, the system should
> > hold pressure in the accumulator.
> > 
> > With age, the brake servo can leak by and/or the accumulator bypass valve
> > can leak by. This drains fluid from the accumulator back to the reservoir.
> > If enough fluid drains back, the pressure falls below the low pressure alarm
> > point and the "brake" light comes on to warn of low brake assist pressure.
> > This is the usual cause of the "brake light on in the morning, goes off 30
> > seconds after I start the car" syndrome. A sure sign of this happening is
> > the level in the reservoir rising overnight as the car sits.
> > 
> > The accumulator has nothing to do with the power steering circuit.
> > 
> > The steering problem is likely caused by low pressure in the steering
> > circuit or a sticky spool valve in the rack. The inside of the rubber hoses
> > start to break down with age and the little rubber particles clog the
> > screens in the banjo bolts and various orfices in the system. A flush of the
> > hydraulic system can eliminate the "light on in the morning" syndrome and
> > the loss of power steering assist by purging out the rubber particles. If
> > your fluid is black instead of clear green you need a flush.
> > 
> > One important note: these cars are IMPOSSIBLE to stop with no brake assist.
> > Your legs just aren't strong enough to generate effective manual braking
> > with this system. It is vitally important that the brake assist system be
> > kept in good working order.
> > 
> > HTH
> > 
> > Fred Munro
> > '97 S6
> > 
> > 
> > -----Original Message-----
> > From: s-car-list-bounces at audifans.com
> > [mailto:s-car-list-bounces at audifans.com] On Behalf Of Jared Robinson
> > Sent: June 25, 2009 7:01 PM
> > To: s-car-list at audifans.com
> > Subject: [s-cars] occasional brake light on start and sometimes difficult
> > steering
> > 
> > So, I was reading some posts about the hydraulic system...
> > Once in a while (say once every 2-3 weeks) the brake light stays on for 30
> > seconds or less after starting the car. it normally goes away by the time I
> > rev the motor...
> > Also, sometimes when I'm at the end of my trip and pulling into my spot at
> > the train station, I go to turn the steering wheel from a stop and it's VERY
> > heavy... almost un-turnable... if I rev the motor, I get plenty of assist
> > though... It doesn't do it all the time though, sometimes it does it once a
> > week... sometimes twice.
> > I saw something about these two problems possibly being related...
> > It only really started doing it after I put 17" wheels on the car though. I
> > never noticed it with the 15" snow tires.
> > 
> > What's the story?
> > 
> > -- 
> > Jared Robinson
> >_______________________________________________
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> > http://audifans.com/mailman/listinfo/s-car-list 
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> > 
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