'88 5KSQ (Type 44) Brake Problems
Beatty, Robert
BeattyR at ummhc.org
Fri Sep 29 07:41:27 EDT 2000
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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