ABS Operation, was Re: Warning Lights

["Fred Munro" <munrof@isys.ca>]

----- Original Message -----
From: <OorQue@aol.com>
To: <munrof@isys.ca>; <Steven.Buchholz@kla-tencor.com>;
<quattro@audifans.com>
Sent: Saturday, October 02, 1999 6:09 AM
Subject: Re: Warning Lights


> >  It takes energy to do this, and the only source of energy is the
hydraulic
> pressure in the bomb
>
> So what does that make the +12 VDC that's fed to it via the wiring
harness?
> ;^)
>
> JG
>

    I didn't think the harness would supply enough 12 VDC power to drive a
pump to put out the 2000 - 3000 psig required for the brake system. However,
I see there is a 10 gauge wire feeding an ABS Return Flow Pump, whatever
it's function is.
    I seem to recall a post (I think it was from Phil Payne) a while back
saying that activation of the ABS ate up the stored pressure in the bomb in
short order, and activating the ABS with a bad bomb was bad news. As I
understand Steve's post, he is saying that the bomb/hydraulic boost system
has nothing to do with the ABS system and a bad bomb will not affect ABS
operation. Is this correct?
Can anyone explain how the ABS modulator/ABS return flow pump/ master
cylinder interact?

Fred Munro
'91 200q  281k km