'88 5KSQ (Type 44) Brake Problems

[Beatty, Robert]

Note to all.... a sinking pedal is almost certainly a MASTER CYLINDER.  The
fluid is starting to seep past the o-rings inside the cylinder and thats why
it sinks slowly.

Rob

> -----Original Message-----
> From:	Matthew Caprio [SMTP:caprio at flash.net]
> Sent:	Thursday, September 28, 2000 6:44 PM
> To:	quattro at audifans.com
> Subject:	Re: '88 5KSQ (Type 44) Brake Problems
> 
> Christopher-
> 
> My car (885ksq) does the SAME thing... I think it's the Bomb.  I know you
> said yours is new but, it could still be bad.  How "new"?  I've heard of
> people's going bad after only a year.  I even heard of a guy thinking he
> could buy a "good" used one for $5.  I hope that wasn't the one you
> bought.
> 
> Here's what my car does:
> At IDLE, if I hold the pedal down, it will go (slowly) all the way to the
> floor, and pulsate slightly on the way down.  Then the brake warning light
> will come on.  I think if you connect your switch, it will do the same.
> If
> I am running the car at >2krpm, it will NOT go to the floor.  Then, if I
> shut the car off, the pedal goes rock hard instantly, and will NOT go to
> the floor.  I guess it COULD be the MC, I've just always figured that
> since
> my bomb gives dead symptoms, that it's the cause of the pedal being able
> to
> go all the way down.  It doesn't totally make sense to me where the fluid
> is all going when the pedal goes down, but then again, it doesn't make
> sense to me that you should be able to consume the accumulated fluid in a
> good bomb with the engine off by pumping it either...  SOMEBODY correct me
> too if I'm wrong about all this.  And Chris, if your bomb IS STILL GOOD,
> (you get about 20 pedals out of it with the engine off), then let me know,
> because that would indicate that our problem is servo or MC.  Hell, maybe
> it's the damn pump.  I guess I'm not sure.  I bet that was of help!?!
> 
> Thanks,
> Matt
> 
> 
> At 01:12 AM 9/28/00 GMT, you wrote:
> >The brake pedal on my '88 5KSQ will slowly go to or near the floor if I
> hold 
> >pressure on it.  The warning light switch on the servo for the Autocheck 
> >system is disabled.  The car has a new pump and pressure accumulator 
> >("bomb").  In a normal car, I would suspect the master cylinder.  But
> what 
> >is the "brake servo"?  That is the thing between the pedal and the master
> 
> >cylinder.  What does it do?
> >
> >At about 120K miles, I am ready to replace the master cylinder.  No
> rebuilds 
> >for this critical part.  Should I also replace the servo?
> >
> >
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> ----
> 88 5ksq
> Matthew Caprio
> Austin, TX
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