No subject

Thu Oct 4 17:35:34 PDT 2007

with UFO brakes, was that the locator bolt reduced the chances of
early "warpage" by locating the rotor so that it was centered around the
lug bolt holes...

The lug bolts would not hold the rotor in place by applying the force 
to the sides of the rotor hole, but through friction between the wheel and 
and hub after the lug bolts were torqued down.

Not sure why it would work better, but here is what I had heard.....take
it with a grain of salt as usual.


----- Original Message ----- 
From: "Bernie Benz" <b.benz at>
To: <brett at>
Cc: "200q20V mailing list" <200q20v at>
Sent: Sunday, November 04, 2007 11:11 PM
Subject: Re: UFO screw

>I agree, Brett.
> Why did Audi decide that braking torque should not be distributed
> from the hub to the rotor via the lug bolts, and apparently to my
> knowledge, only on the V8 and 200Q-20V UFOs? Apparently, all past and
> current conventual rotor applications use the lug bolts exclusively.
> Maybe your point that the subject screw and plug rotor alignment
> is only to ease UFO wheel installation, is its only justification?
> Bernie
> On Nov 4, 2007, at 7:02 PM, Brett Dikeman wrote:
>> On Nov 4, 2007, at 12:44 PM, Kneale Brownson wrote:
>> I stopped using the set screws a few years ago.  I never found it to
>> be a significant burden to align the rotor, hub, and wheel, IMHO.  I
>> wouldn't sweat it, unless there's some purpose to the screw besides
>> making wheel installation easier.  I just put a wheel on, align it to
>> the rotor (easy to do, the rotor spins pretty freely), and then spin
>> the two together until a lug bolt I'm pressing pops into the hub a
>> bit.
>> But, most of the time it was with the luxury of time, some light, and
>> a driveway :-)
>> Brett
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