UFO brake question
sscalmanini at yahoo.com
Mon May 12 00:21:33 PDT 2008
No Q, Bernie. I know you've had great luck with your UFO's but mine and
many others hasn't been as good. I follow your advice, though, to not
Turning has always trued my UFO's to within .001" TIR and then each runs
for 3-15 months before wobbling again. I've never tried your shim
technique but I'll give it a shot some time. I made a tool over a
decade ago to measure runout. (Aluminum bar that holds a dial indicator
on one end and can be clamped to the anti-sway bar with a Vice Grip. I
posted it's design once.) So I'll try shims some time and post the
Have you ever tried steel shim-stock (available from machinist supplies
- looks like a loooong feeler gage - available in plenty of
thicknesses)? An appropriate thickness could be cut and adhered
adjacent to both sides of each appropriate hole in the mounting surface
of the rotor, perhaps with a thin coat of Permatex (the alcohol-soluble
brown goo.) Then the shims might stay in place if/when the rotor was
I've confirmed several times over the years what you posted years ago
that UFO warpage can be felt in the brake pedal starting at ~ .002" TIR,
and by the time it gets to .007" it feels like the front end is shaking
I've never messed with the heat-'em-up technique for fear of making them
worse or some other aspect of Murphy's Law.
PS: My front-end rubber is still original at 245K so that's the next
project on the car list.
Sun, 11 May 2008 16:20:07 -0700, Bernie Benz wrote:
> What’s your Q? I’ll throw one back at you!
> Why do you think that they need repeated re machining? IMO, it’s a
> waste of good material and the trueness derived for normal wear. Mine
> at 225K have never been re machined, are dead true, and I believe will
> remain so for another 250K.
> On May 11, 2008, at 3:29 PM, Steve Scalmanini wrote:
>> If you don't know where to get your UFOs turned (in San Jose, CA) from a
>> post years ago, it's on Chris Miller's site.
>> I have 3 extra sets and every 3/4/5 years I send or drop off the 6 not
>> on the car to get turned.
>> Ukiah, CA
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