G-60 rebuild or?

[Bernie Benz]

Tracking won't hurt caliper functionality, fluid change or not.  Fluid
moisture absorption is the cause of your sludge problem and a low boiling
point track problem.  Your problem is the lack of PM by the PO, which
subsiquent bleeding, biennially or biannually, can not correct.  Overhaul
all calipers and never experience the problem again with regular bleeding.

Bernie 

> From: "Ingo Rautenberg" <i.rautenberg at waratap.com>
> 
> Bernie,  Thanks for the advice.  Will have to go the air route (caliper
> removed from car) and avoid flying projectiles.
> 
> As to bleeding the system biennially(every two years), I'm already bleeding
> the system biannually (twice a year).  Not to say how often it was done
> before I bought the car or that tracking may have boiled the fluid ;-)
> 
> -Ingo
> 
> ----- Original Message -----
> From: "Bernie Benz" <b.benz at charter.net>
>> Ingo,
>> 
>> If the caliper is still attached to the brake hydraulics and loose from
> its
>> carrier, you can use the brake pedal, otherwise use air pressure.  Put a
>> piece of wood across the caliper to catch the first to free piston before
> it
>> leaves its bore, or it will be across the room and you'll not get the
> second
>> one to pop.  If frozen as you describe, plan to overhaul all 4.  You'll
>> agree after you see the insides of the first one.
>> 
>> If the boots are good you don't need rebuild kits, just a good internal
>> cleaning of all parts, seals and seal grooves.  Polish the chrome plated
>> pistons with 600 grit paper.  I use a silicone fluid as assembly lube.
>> Hereafter bleed the hydraulics biennially, to eliminate the problem.
>> 
>> Bernie
>> 
>> 
>> 
>>> From: "Ingo Rautenberg" <i.rautenberg at waratap.com>
>>> Date: Fri, 4 Feb 2005 10:48:10 -0500
>>> To: "UrqList" <urq at audifans.com>, "200q20v List" <200q20v at audifans.com>
>>> Subject: G-60 rebuild or?
>>> 
>>> Just replaced the seized right front G60 caliper on the Urq with one
> from the
>>> V8 and was hoping for words of wisdom.  I initially thought the carrier
> pins
>>> were frozen (usually the case) though I tend to lube them up and check
> them
>>> periodically.  Mine were fine.  The pistons were (are) stuck.  The boots
> are
>>> intact as far as I can see.  So what do I do?  Don't want to distort the
>>> pistons by using vise-grips or the like...
>>> 
>>> -Ingo
>>> '91 200q20v...Slightly modified
>>> '84 Tornado Red Urquattro Euro spec
>>> '91 v8 quattro 5-Speed (not exactly stock) :-)
>>> '91 V8 pearl (new addition)
>>> http://hometown.aol.com/quattringo/index.html
>>> 
>>> 
>>> 
>>> 
>>> ---
>>> Outgoing mail is certified Virus Free.
>>> Checked by AVG anti-virus system (http://www.grisoft.com).
>>> Version: 6.0.852 / Virus Database: 580 - Release Date: 1/31/2005
>>> _______________________________________________
>>> 200q20v mailing list  http://www.audifans.com/mailman/listinfo/200q20v
>> 
>> 
> 
> 
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.852 / Virus Database: 580 - Release Date: 1/31/2005
>