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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@austin.rr.com>
To: FOT <fot@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?
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Donate:
Archive: http://www.team.net/archive
Forums:
http://www.team.net/forums
http://autox.team.net/mailman/options/fot/fubog1@aol.com
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<font color='black' size='2' face='Arial, Helvetica, sans-serif'>I t<font
size="2">ry to keep it below .005, .002-3 is fine, when it gets much over .010
you'll start to get some pedal bounce.<br>
Most of the problems are poor setup when they are machined.<br>
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.<br>
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.<br>
I try to use Brembo if available.<br>
Glen<br>
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<div
style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
Message-----<br>
From: Greg And Alison Blake <ablake2@austin.rr.com><br>
To: FOT <fot@autox.team.net><br>
Sent: Sat, Sep 12, 2015 7:38 pm<br>
Subject: [Fot] Rotor runout<br>
<br>
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#000;background-color: #fff;">
<pre style="font-size: 9pt;"><tt>
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?
_______________________________________________
<a
removedlink__39037cbc-dc86-4971-b0f0-924960909853__href="mailto:fot@autox.team.net";>fot@autox.team.net</a>
<a
removedlink__39037cbc-dc86-4971-b0f0-924960909853__href="http://www.fot-racing.com";
target="_blank">http://www.fot-racing.com</a>
Donate:
<a
removedlink__39037cbc-dc86-4971-b0f0-924960909853__href="http://www.team.net/donate.html";
target="_blank">http://www.team.net/donate.html</a>
Archive: <a
removedlink__39037cbc-dc86-4971-b0f0-924960909853__href="http://www.team.net/archive";
target="_blank">http://www.team.net/archive</a>
Forums:
<a
removedlink__39037cbc-dc86-4971-b0f0-924960909853__href="http://www.team.net/forums";
target="_blank">http://www.team.net/forums</a>
<a
removedlink__39037cbc-dc86-4971-b0f0-924960909853__href="http://autox.team.net/mailman/options/fot/fubog1@aol.com";
target="_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.com</a>
</tt></pre>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
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