Subject: [Shop-talk] brake shudder

From: "john niolon" <[email-masked]>
Date: Sat, 27 Sep 2025 09:43:44 -0500

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well I carry tools in my suburban (shop content)
=20
Mt problem is a 2008 suburban that has always had a brake shudder (warped=
=20
rotor) problem since I've had it... every year it seems it's=20
replace rotor time.
=20
This year I know I had two  never turned rotors.  I put a dial indicator on=
=20
rotors and saw no more than .002 runout.. so I decided to just get
them turned just to see what difference it would make. =20
=20
Took them to a reputable shop that turned them and reinstalled.  First driv=
e=20
was thru the neighborhood with no shudder.
Second drive was a ten mile trip on freeway... when exiting freeway I felt =
the=20
shudder and it seemed worse than before I turned
the rotors...
=20
I'm going to tear them back down next week to check everything but wonderin=
g if there is something else I need to check or be
concerned about.  I did try stopping with just the parking brake with no sh=
udder so that eliminates the rear rotors causing the
problem.  Pads look nearly new and fit in the caliper nicely... Caliper pis=
tons are retracting as the should (pads are not bound to rotor when
removing wheels. Lines look ok from the outside. Caliper pins are smooth an=
d well lubricated.
=20
any ideas/suggestions/true life experiences/fantastic tales ???
john
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<HTML><HEAD>
<META name=3DGENERATOR content=3D"MSHTML 11.00.10570.1001"></HEAD>
<BODY>
<DIV><FONT face=3D"Segoe UI">well I carry tools in my suburban (shop conten=
t)</FONT></DIV>
<DIV><FONT face=3D"Segoe UI"></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"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=3D"Segoe UI">replace rotor time.</FONT></DIV>
<DIV><FONT face=3D"Segoe UI"></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"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 ru=
nout.. so I decided to just&nbsp;get</FONT></DIV>
<DIV><FONT face=3D"Segoe UI">them turned just to see what difference it wou=
ld make.&nbsp; </FONT></DIV>
<DIV><FONT face=3D"Segoe UI"></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Segoe UI">Took them to a reputable shop that turned them=
 and reinstalled.&nbsp; First drive was thru the neighborhood with no shudd=
er.</FONT></DIV>
<DIV><FONT face=3D"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=3D"Segoe UI">the rotors...</FONT></DIV>
<DIV><FONT face=3D"Segoe UI"></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"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 o=
r be</FONT></DIV>
<DIV><FONT face=3D"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</FONT></DIV>
<DIV><FONT face=3D"Segoe UI">problem.&nbsp; Pads look nearly new and fit in=
 the caliper nicely... Caliper pistons are retracting as the should (pads a=
re not bound to rotor when</FONT></DIV>
<DIV><FONT face=3D"Segoe UI">removing wheels. Lines look ok from the outsid=
e. Caliper pins are smooth and well lubricated.</FONT></DIV>
<DIV><FONT face=3D"Segoe UI"></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Segoe UI">any ideas/suggestions/true life experiences/fa=
ntastic tales ???</FONT></DIV>
<DIV><FONT face=3D"Segoe UI">john</FONT></DIV></BODY></HTML>
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_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive

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From: Eric Russell <[email-masked]>
Date: Sat, 27 Sep 2025 11:13:29 -0400

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How are you bedding in the pads? My understanding is that pads will
transfer some material to the rotors and you want this to be done as evenly
as possible. Try this: (find a safe place to do it, of course)  Make ~ 6 to
10 hard brake applications from ~ 60mph to ~ 20 mph (not fully stopping)
with a few minutes of driving between each brake application to allow the
brakes to cool. Avoid making a hard brake application then coming to a
complete stop.

EjR

On Sat, Sep 27, 2025 at 10:56=E2=80=AFAM john niolon <[email-masked]> wrot=
e:

> 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 fel=
t
> 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.
>
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/[email-masked]
>
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:large">How=
 are you bedding in the pads? My understanding is that pads will transfer s=
ome material to the=C2=A0rotors and you want this to be done as evenly as p=
ossible. Try this: (find a safe place to do it, of course)=C2=A0 Make ~ 6 t=
o 10 hard brake applications from ~ 60mph to ~ 20 mph (not fully stopping) =
with a few minutes of driving between each brake application to allow the b=
rakes to cool. Avoid making a hard brake application then coming to a compl=
ete stop.=C2=A0</div><div class=3D"gmail_default" style=3D"font-size:large"=
><br></div><div class=3D"gmail_default" style=3D"font-size:large">EjR=C2=A0=
</div></div><br><div class=3D"gmail_quote gmail_quote_container"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sat, Sep 27, 2025 at 10:56=E2=80=AFAM john=
 niolon &lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">

<div>
<div><font face=3D"Segoe UI">well I carry tools in my suburban (shop conten=
t)</font></div>
<div><font face=3D"Segoe UI"></font>=C2=A0</div>
<div><font face=3D"Segoe UI">Mt problem is a 2008 suburban that has always =
had a brake shudder (warped rotor) problem since I&#39;ve had it... every y=
ear it seems it&#39;s </font></div>
<div><font face=3D"Segoe UI">replace rotor time.</font></div>
<div><font face=3D"Segoe UI"></font>=C2=A0</div>
<div><font face=3D"Segoe UI">This year I know I had two=C2=A0 never turned =
rotors.=C2=A0 I put a dial indicator on rotors and saw no more than .002 ru=
nout.. so I decided to just=C2=A0get</font></div>
<div><font face=3D"Segoe UI">them turned just to see what difference it wou=
ld make.=C2=A0 </font></div>
<div><font face=3D"Segoe UI"></font>=C2=A0</div>
<div><font face=3D"Segoe UI">Took them to a reputable shop that turned them=
 and reinstalled.=C2=A0 First drive was thru the neighborhood with no shudd=
er.</font></div>
<div><font face=3D"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=3D"Segoe UI">the rotors...</font></div>
<div><font face=3D"Segoe UI"></font>=C2=A0</div>
<div><font face=3D"Segoe UI">I&#39;m going to tear them back down next week=
 to check everything but wondering if there is something else I need to che=
ck or be</font></div>
<div><font face=3D"Segoe UI">concerned about.=C2=A0 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=3D"Segoe UI">problem.=C2=A0 Pads look nearly new and fit in=
 the caliper nicely... Caliper pistons are retracting as the should (pads a=
re not bound to rotor when</font></div>
<div><font face=3D"Segoe UI">removing wheels. Lines look ok from the outsid=
e. Caliper pins are smooth and well lubricated.</font></div>
<div><font face=3D"Segoe UI"></font>=C2=A0</div>
<div><font face=3D"Segoe UI">any ideas/suggestions/true life experiences/fa=
ntastic tales ???</font></div>
<div><font face=3D"Segoe UI">john</font></div></div>_______________________=
________________________<br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">Shop-talk@aut=
ox.team.net</a><br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/shop-talk" rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/pipermail/shop-talk</a> <a href=
=3D"http://autox.team.net/archive" rel=3D"noreferrer" target=3D"_blank">htt=
p://autox.team.net/archive</a><br>
<br>
alk/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://auto=
x.team.net/mailman/options/shop-talk/[email-masked]</a><br>
<br>
</blockquote></div>

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[email-masked]

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From: John T Blair <[email-masked]>
Date: Sat, 27 Sep 2025 15:57:32 +0000 (UTC)

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On Saturday, September 27, 2025 at 11:04:34 AM EDT,=C2=A0 you wrote: =20
 >My problem is a 2008 suburban that has always had a brake shudder=C2=A0>(=
warped rotor) problem since I've had it... every year it seems it's=20
>replace rotor time.
=C2=A0>any ideas/suggestions/true life experiences/fantastic tales ???
John,
Have you check the caliper pins to ensue they are tight?=C2=A0 They aren't =
expensive, I'd suggest that you shot gun them.=C2=A0=20

JohnT,

John T. Blair=C2=A0 WA4OHZ=C2=A0=C2=A0=C2=A0=C2=A0 email:=C2=A0 jblair1948@=
cox.netVa. Beach, Va=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Phone:=C2=A0 (757) 495-822=
9

48 TR1800=C2=A0=C2=A0=C2=A0 48 #4 Midget=C2=A0=C2=A0=C2=A0 65 Morgan 4/4 Se=
ries V (B1106)
=C2=A0=C2=A0=C2=A0=C2=A0 75 Bricklin SV1 (#0887)=C2=A0=C2=A0=C2=A0 77 Spitf=
ire=C2=A0=C2=A0=C2=A0 71 Saab Sonett III
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 65 Rambler Classi=
c

Morgan:=C2=A0=C2=A0=C2=A0 http://autox.team.net/morgan/

Bricklin:=C2=A0=C2=A0=C2=A0=C2=A0 http://www.bricklin.org=20

If you can read this=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 - Thank a teacher!If you are reading it in English - Tha=
nk a Vet!!

>From Dennis Prager - The American Trilogy:
=C2=A0=C2=A0=C2=A0=C2=A0 e pluribus Unum, "from many, one."
=C2=A0=C2=A0=C2=A0=C2=A0 In God We Trust
=C2=A0=C2=A0=C2=A0=C2=A0 Liberty - the=C2=A0 power=C2=A0 of=C2=A0 choosing,=
=C2=A0 thinking,=C2=A0 and=C2=A0 acting=C2=A0 for=C2=A0=20
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 oneself; freedom=C2=A0 from=C2=A0 control=C2=A0=
 or=C2=A0 restriction=C2=A0=20

 =20

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<html><head></head><body><div class=3D"yahoo-style-wrap" style=3D"font-fami=
ly:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div id=3D=
"ydp83b6286cyahoo_quoted_9917034274" class=3D"ydp83b6286cyahoo_quoted" dir=
=3D"ltr" data-setdir=3D"false"><div><font size=3D"3">On Saturday, September=
 27, 2025 at 11:04:34 AM EDT,&nbsp; you wrote:
                    </font></div><div style=3D"font-family: &quot;Helvetica=
 Neue&quot;, Helvetica, Arial, sans-serif; color: rgb(38, 40, 42);">
                    <div><font size=3D"3"><br></font></div>
                    <div><div><font size=3D"3">&gt;</font><font size=3D"3" =
face=3D"Segoe UI">My problem is a 2008 suburban that has always had a brake=
 shudder&nbsp;</font></div><div><font size=3D"3" face=3D"Segoe UI">&gt;(war=
ped rotor) problem since I've had it... every year it seems it's <br></font=
></div><div><font size=3D"3" face=3D"Segoe UI">&gt;replace rotor time.</fon=
t></div><div><font size=3D"3" face=3D"Segoe UI"><br></font></div>
<div><font size=3D"3">&nbsp;</font><font size=3D"3" face=3D"Segoe UI">&gt;a=
ny ideas/suggestions/true life experiences/fantastic tales ???</font></div>=
<div><font size=3D"3" face=3D"Segoe UI"><br></font></div>
<div dir=3D"ltr" data-setdir=3D"false"><font size=3D"3" face=3D"Segoe UI">J=
ohn,</font></div><div dir=3D"ltr" data-setdir=3D"false"><font size=3D"3" fa=
ce=3D"Segoe UI"><br></font></div><div dir=3D"ltr" data-setdir=3D"false"><fo=
nt size=3D"3" face=3D"Segoe UI">Have you check the caliper pins to ensue th=
ey are tight?&nbsp; They aren't expensive, I'd suggest that you shot gun th=
em.&nbsp; <br></font></div><div dir=3D"ltr" data-setdir=3D"false"><font siz=
e=3D"3" face=3D"Segoe UI"><br></font></div><div dir=3D"ltr" data-setdir=3D"=
false"><font size=3D"3" face=3D"Segoe UI">JohnT,</font></div><div dir=3D"lt=
r" data-setdir=3D"false"><font size=3D"3" face=3D"Segoe UI"><br></font></di=
v><div><font size=3D"3" face=3D"Segoe UI"><br></font></div><div><font size=
=3D"3" face=3D"Segoe UI"><br></font></div><div><font size=3D"3" face=3D"Seg=
oe UI"><br></font></div><div><font size=3D"3" face=3D"Segoe UI"><br></font>=
</div><div dir=3D"ltr" data-setdir=3D"false"><font size=3D"3" face=3D"Segoe=
 UI"><div><div><div><br></div><div><br></div><div class=3D"ydp3d93b2c2signa=
ture"><div dir=3D"ltr" style=3D"font-family: Helvetica, Arial, sans-serif;"=
><div class=3D"ydpca89bbc3pasted-link"><br><div>
John T. Blair&nbsp; WA4OHZ&nbsp;&nbsp;&nbsp;&nbsp; email:&nbsp; jblair1948@=
cox.net</div>
Va. Beach, Va&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Phone:&nbsp; (757) 495-8229<br><br=
48 TR1800&nbsp;&nbsp;&nbsp; 48 #4 Midget&nbsp;&nbsp;&nbsp; 65 Morgan 4/4 Se=
ries V (B1106)<br>
&nbsp;&nbsp;&nbsp;&nbsp; 75 Bricklin SV1 (#0887)&nbsp;&nbsp;&nbsp; 77 Spitf=
ire&nbsp;&nbsp;&nbsp; 71 Saab Sonett III<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 65 Rambler Classi=
c<br><br>
Morgan:&nbsp;&nbsp;&nbsp; <a href=3D"http://autox.team.net/morgan/" rel=3D"=
nofollow" target=3D"_blank">http://autox.team.net/morgan/<br><br></a><div><=
a href=3D"http://autox.team.net/morgan/" rel=3D"nofollow" target=3D"_blank"=
 class=3D"">
</a>Bricklin:&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://www.bricklin.org/" =
rel=3D"nofollow" target=3D"_blank" class=3D"">http://www.bricklin.org <br><=
/a></div><div><br></div><div>If you can read this&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - Thank a teacher!</div>
If you are reading it in English - Thank a Vet!!<br><br>
>From Dennis Prager - The American Trilogy:<br>
&nbsp;&nbsp;&nbsp;&nbsp; e pluribus Unum, "from many, one."<br>
&nbsp;&nbsp;&nbsp;&nbsp; In God We Trust<br>
&nbsp;&nbsp;&nbsp;&nbsp; Liberty - the&nbsp; power&nbsp; of&nbsp; choosing,=
&nbsp; thinking,&nbsp; and&nbsp; acting&nbsp; for&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; oneself; freedom&nbsp; from&nbsp; control&nbsp;=
 or&nbsp; restriction&nbsp; <br><br></div></div></div></div></div></font></=
div></div><div><font size=3D"3"><br></font></div>
            </div>
        </div></div><div id=3D"DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
<table style=3D"border-top: 1px solid #D3D4DE;">
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=09=09<td style=3D"width: 470px; padding-top: 12px; color: #41424e; font-si=
ze: 13px; font-family: Arial, Helvetica, sans-serif; line-height: 18px;">Vi=
rus-free. <a href=3D"https://www.avast.com/sig-email?utm_medium=3Demail&utm=
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[email-masked]

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From: Ronnie Day <[email-masked]>
Date: Sat, 27 Sep 2025 11:05:00 -0500

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If the rotors don=E2=80=99t show significant warping, I=E2=80=99d check for=
 worn tie rod
ends or problems with the rack and pinion unit itself.

On Sat, Sep 27, 2025 at 10:54=E2=80=AFAM Eric Russell <[email-masked]=
m> wrote:

> transfer some material to the rotors and you want this to be done as even=
ly
> as possible. Try this: (find a safe place to do it, of course)  Make ~ 6 =
to
> On Sat, Sep 27, 2025 at 10:56=E2=80=AFAM john niolon <[email-masked]> wr=
ote:
>> Mt problem is a 2008 suburban that has always had a brake shudder (warpe=
d
>> 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...
>>
> http://autox.team.net/mailman/options/shop-talk/[email-masked]
>
>

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<div dir=3D"auto">If the rotors don=E2=80=99t show significant warping, I=
=E2=80=99d check for worn tie rod ends or problems with the rack and pinion=
 unit itself.</div><div><br><div class=3D"gmail_quote gmail_quote_container=
"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Sep 27, 2025 at 10:54=E2=80=
=AFAM Eric Russell &lt;<a href=3D"mailto:[email-masked]">ejrussell61=
@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:large">How are you=
 bedding in the pads? My understanding is that pads will transfer some mate=
rial to the=C2=A0rotors and you want this to be done as evenly as possible.=
 Try this: (find a safe place to do it, of course)=C2=A0 Make ~ 6 to 10 har=
d brake applications from ~ 60mph to ~ 20 mph (not fully stopping) with a f=
ew minutes of driving between each brake application to allow the brakes to=
 cool. Avoid making a hard brake application then coming to a complete stop=
.=C2=A0</div><div class=3D"gmail_default" style=3D"font-size:large"><br></d=
iv><div class=3D"gmail_default" style=3D"font-size:large">EjR=C2=A0</div></=
div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On=
 Sat, Sep 27, 2025 at 10:56=E2=80=AFAM john niolon &lt;<a href=3D"mailto:jn=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">

<div>
_______________________________________________<br>
alk/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox=
.team.net/mailman/options/shop-talk/[email-masked]</a><br>
<br>
</blockquote></div></div>

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From: [email-masked]
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

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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" <[email-masked]>
To:     "shop-talk" <[email-masked]>
Date:   09/27/2025 10:59 AM
Subject:        [Shop-talk] brake shudder
Sent by:        "Shop-talk" <[email-masked]>

 
 
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...

any ideas/suggestions/true life experiences/fantastic tales ???
john_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk 
http://autox.team.net/archive

http://autox.team.net/mailman/options/shop-talk/[email-masked]

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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;[email-masked]&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;[email-masked]&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;[email-masked]&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>
[email-masked]<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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From: Bob Spidell <[email-masked]> 8Z6UuM3V/USuSqHxQCY3fu8vqAa3Q1H6HTKSiFRTC4DNPT4h/C+KegYSCyITXB7QSk0onizYtAx8YDTeIHi4g9eEPNfpPrD1Aps=
Date: Sat, 27 Sep 2025 14:02:52 -0700

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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:
> 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
> 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.
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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    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>
  </body>
</html>

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[email-masked]

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