Re: Audi 5000 Question. 85?

[Eddi Jew <jew@rysa.dtc.hp.com>]

 > >
 > >James Steele wrote:
 > >
 > > I'm not sure on how independent the steering circuit is from the
 > >braking system, but I followed the steps spelled out in the Bentley 
 > >manual.

Oh, I was the one that wrote that.

 > The hydraulic and braking systems are separate. 
 > 
 > The hydraulic system consists of a single reservoir (the cylindrical one)
 > serving both the brake and steering boost sub-systems. 

This was the part I'm not sure about- would air in the hydraulic brake
sub-system travel to the steering sub-system, due to the common reservoir? 
 
 > The steering
 > subsystem consists of a hydraulic pump and the steering rack.  The brake
 > boost subsystem consists of a hydraulic pump (in the same enclosure as the
 > steering boost pump, a pressure accumulator, and a power booster.  The
 > booster (or whatever Audi calls it) is connected _mechanically_ to the brake
 > master cylinder.  From the master cylinder on, the brake system is
 > conventional VW/Audi, and uses normal DOT 3/4 fluid.  

 > BTW, the brake fluid
 > reservoir (the rectangular one)  also supplies brake fluid to the hydraulic
 > clutch circuit on cars with a do it yourself shifter (i.e., fluid for
 > hydraulic actuation of the clutch when you press the pedal).

My realization of this came when my master clutch cylinder semi-failed and
I hit myself for not changing its brake fluid when doing the preventive
bleeding of the brake lines. I hit myself harder when I found that the
supply hose is at the top-most portion of the (rectangular) reservoir
because I usually top it off with the car on the driveway (not level).
I guess it was designed that way- I wouldn't want a leak in the clutch
hydraulics to compromise my braking.

I normally don't knock myself so bad- relatively speaking, the master 
cylinder replacement is a simple series of steps. But I found under-dash
work a real pain. The contortionist kind of pain (ouch).

 > Jason
 > 86 5000S

-- Eddi Jew
   '86 5000S with (obvious from above) a do it yourself shifter