G-60 rebuild or?

Bernie Benz b.benz at charter.net
Fri Feb 4 12:23:56 EST 2005


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.


> 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
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