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Re: [Shop-talk] brake shudder

To: Shop-talk@autox.team.net type=4; name=$KeepSent
Subject: Re: [Shop-talk] brake shudder
From: eric@megageek.com
Date: Sat, 27 Sep 2025 12:35:35 -0400 09/27/2025 12:35:37 PM, Serialize complete at 09/27/2025 12:35:37 PM
Delivered-to: mharc@autox.team.net
Delivered-to: Shop-talk@autox.team.net
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John,

A couple of things, I didn't think you turn a modern rotor. There normally 
isn't enough 'meet' to remove them and have them be stout enough.  I think 
that is why you had a problem with the turned rotors so quickly.

My other question, do you have speed bumps that you regularly have to go 
over?  What about pot holes?  I always learned that braking while going 
over large bumps or pot holes is a good way to warp a rotor.

I'm just throwing these out there.  I have no other in sight.

Have a great day.

Moose



From:   "john niolon" <jniolon@att.net>
To:     "shop-talk" <shop-talk@autox.team.net>
Date:   09/27/2025 10:59 AM
Subject:        [Shop-talk] brake shudder
Sent by:        "Shop-talk" <shop-talk-bounces@autox.team.net>



well I carry tools in my suburban (shop content)
 
Mt problem is a 2008 suburban that has always had a brake shudder (warped 
rotor) problem since I've had it... every year it seems it's 
replace rotor time.
 
This year I know I had two  never turned rotors.  I put a dial indicator 
on rotors and saw no more than .002 runout.. so I decided to just get
them turned just to see what difference it would make. 
 
Took them to a reputable shop that turned them and reinstalled.  First 
drive was thru the neighborhood with no shudder.
Second drive was a ten mile trip on freeway... when exiting freeway I felt 
the shudder and it seemed worse than before I turned
the rotors...
 
I'm going to tear them back down next week to check everything but 
wondering if there is something else I need to check or be
concerned about.  I did try stopping with just the parking brake with no 
shudder so that eliminates the rear rotors causing the
problem.  Pads look nearly new and fit in the caliper nicely... Caliper 
pistons are retracting as the should (pads are not bound to rotor when
removing wheels. Lines look ok from the outside. Caliper pins are smooth 
and well lubricated.
 
any ideas/suggestions/true life experiences/fantastic tales ???
john_______________________________________________

Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk 
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http://autox.team.net/mailman/options/shop-talk/eric@megageek.com





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<span style=" font-size:10pt;font-family:sans-serif">John,</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">A couple of things,
I didn't think you turn a modern rotor. There normally isn't enough 'meet'
to remove them and have them be stout enough. &nbsp;I think that is why
you had a problem with the turned rotors so quickly.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">My other question,
do you have speed bumps that you regularly have to go over? &nbsp;What
about pot holes? &nbsp;I always learned that braking while going over large
bumps or pot holes is a good way to warp a rotor.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">I'm just throwing
these out there. &nbsp;I have no other in sight.</span>
<br><span style=" font-size:10pt;font-family:sans-serif"><br>
Have a great day.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Moose</span>
<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" 
font-size:9pt;font-family:sans-serif">&quot;john
niolon&quot; &lt;jniolon@att.net&gt;</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" 
font-size:9pt;font-family:sans-serif">&quot;shop-talk&quot;
&lt;shop-talk@autox.team.net&gt;</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" 
font-size:9pt;font-family:sans-serif">09/27/2025
10:59 AM</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" 
font-size:9pt;font-family:sans-serif">[Shop-talk]
brake shudder</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" 
font-size:9pt;font-family:sans-serif">&quot;Shop-talk&quot;
&lt;shop-talk-bounces@autox.team.net&gt;</span>
<br>
<hr noshade>
<br>
<br>
<br><span style=" font-size:12pt;font-family:Segoe UI">well I carry tools
in my suburban (shop content)</span>
<br><span style=" font-size:12pt">&nbsp;</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">Mt problem is a
2008 suburban that has always had a brake shudder (warped rotor) problem
since I've had it... every year it seems it's </span>
<br><span style=" font-size:12pt;font-family:Segoe UI">replace rotor 
time.</span>
<br><span style=" font-size:12pt">&nbsp;</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">This year I know
I had two &nbsp;never turned rotors. &nbsp;I put a dial indicator on rotors
and saw no more than .002 runout.. so I decided to just get</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">them turned just
to see what difference it would make. &nbsp;</span>
<br><span style=" font-size:12pt">&nbsp;</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">Took them to a reputable
shop that turned them and reinstalled. &nbsp;First drive was thru the 
neighborhood
with no shudder.</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">Second drive was
a ten mile trip on freeway... when exiting freeway I felt the shudder and
it seemed worse than before I turned</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">the rotors...</span>
<br><span style=" font-size:12pt">&nbsp;</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">I'm going to tear
them back down next week to check everything but wondering if there is
something else I need to check or be</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">concerned about.
&nbsp;I did try stopping with just the parking brake with no shudder so
that eliminates the rear rotors causing the</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">problem. &nbsp;Pads
look nearly new and fit in the caliper nicely... Caliper pistons are retracting
as the should (pads are not bound to rotor when</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">removing wheels.
Lines look ok from the outside. Caliper pins are smooth and well 
lubricated.</span>
<br><span style=" font-size:12pt">&nbsp;</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">any 
ideas/suggestions/true
life experiences/fantastic tales ???</span>
<br><span style=" font-size:12pt;font-family:Segoe UI">john</span><tt><span 
style=" font-size:10pt">_______________________________________________<br>
<br>
Shop-talk@autox.team.net<br>
Archive: </span></tt><a 
href="http://www.team.net/pipermail/shop-talk";><tt><span style=" 
font-size:10pt">http://www.team.net/pipermail/shop-talk</span></tt></a><tt><span
 style=" font-size:10pt">
</span></tt><a href=http://autox.team.net/archive><tt><span style=" 
font-size:10pt">http://autox.team.net/archive</span></tt></a><tt><span style=" 
font-size:10pt"><br>
<br>
<br>
</span></tt>
<br>
<br>

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_______________________________________________

Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive



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