[Fot] Rotor runout

[fubog1]

I try to keep it below .005, .002-3 is fine, when it gets much over .010 you'll start to get some pedal bounce.
Most of the problems are poor setup when they are machined.
Measure inside & outside runout of the disc, thickness, and hub flange runout to determine what's wankered. Sometimes it's a combination and you can minimize it by re-orienting the disc relative to the hub, ie different bolt holes.
As Scott said, new rotors are cheap but also consider that if the brakes are at the limit, these rotors will likely require frequent replacement, they don't hold up well at the extreme with agressive pads, in my experience.
I try to use Brembo if available.
Glen

 

 

 

-----Original Message-----
From: Greg And Alison Blake <ablake2 at austin.rr.com>
To: FOT <fot at autox.team.net>
Sent: Sat, Sep 12, 2015 7:38 pm
Subject: [Fot] Rotor runout



My pads were pulsing pretty bad at the last race so I had the rotors turned at
a shop I trust. 

Upon reinstall today I found that I had 0.010" of runout on
the passenger side rotor. I repacked the bearings and I use the spacer kit which
was setup with about 0.0005" of play. I was curious so I measured the runout on
the uncle jack hub wheel flange and was surprised to find 0.003" of runout in
the hub. 

On the driver's side, rotor was 0.003 and hub wheel flange was
0.0005". 

Did my shop just do a horrible job turning the one rotor?  What
kind of runout is spec for the uncle jack hubs?  Is it possible that a wheel
bearing race has gone wonky on the passenger side hub to cause the whole hub
assemble to have the runout? 





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