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Re: [Shop-talk] brake shudder

To: shop-talk@autox.team.net
Subject: Re: [Shop-talk] brake shudder
From: Bob Spidell <bspidell@comcast.net> 8Z6UuM3V/USuSqHxQCY3fu8vqAa3Q1H6HTKSiFRTC4DNPT4h/C+KegYSCyITXB7QSk0onizYtAx8YDTeIHi4g9eEPNfpPrD1Aps=
Date: Sat, 27 Sep 2025 14:02:52 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <1UkSvWeRAH.3PSHGCDX72r.ref@johns-desktop> <1UkSvWeRAH.3PSHGCDX72r@johns-desktop>
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FWIW ...

https://www.centricparts.com/media/technical_bulletins_docs/Centric_and_APC_Technical_Whitepaper_B1-Warped-Brake-Disc-8-2018_1.pdf


On 9/27/2025 7:43 AM, john niolon wrote:
> 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
>
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    FWIW ...<br>
    <br>
<a class="moz-txt-link-freetext" 
href="https://www.centricparts.com/media/technical_bulletins_docs/Centric_and_APC_Technical_Whitepaper_B1-Warped-Brake-Disc-8-2018_1.pdf";>https://www.centricparts.com/media/technical_bulletins_docs/Centric_and_APC_Technical_Whitepaper_B1-Warped-Brake-Disc-8-2018_1.pdf</a><br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 9/27/2025 7:43 AM, john niolon
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:1UkSvWeRAH.3PSHGCDX72r@johns-desktop">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <meta name="GENERATOR" content="MSHTML 11.00.10570.1001">
      <div><font face="Segoe UI">well I carry tools in my suburban (shop
          content)</font></div>
      <div> </div>
      <div><font face="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 </font></div>
      <div><font face="Segoe UI">replace rotor time.</font></div>
      <div> </div>
      <div><font face="Segoe UI">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</font></div>
      <div><font face="Segoe UI">them turned just to see what difference
          it would make.  </font></div>
      <div> </div>
      <div><font face="Segoe UI">Took them to a reputable shop that
          turned them and reinstalled.  First drive was thru the
          neighborhood with no shudder.</font></div>
      <div><font face="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</font></div>
      <div><font face="Segoe UI">the rotors...</font></div>
      <div> </div>
      <div><font face="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</font></div>
      <div><font face="Segoe UI">concerned about.  I did try stopping
          with just the parking brake with no shudder so that eliminates
          the rear rotors causing the</font></div>
      <div><font face="Segoe UI">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</font></div>
      <div><font face="Segoe UI">removing wheels. Lines look ok from the
          outside. Caliper pins are smooth and well lubricated.</font></div>
      <div> </div>
      <div><font face="Segoe UI">any ideas/suggestions/true life
          experiences/fantastic tales ???</font></div>
      <div><font face="Segoe UI">john</font></div>
      <br>
    </blockquote>
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