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Re: [Shop-talk] brake shudder

To: Eric Russell <ejrussell61@gmail.com>
Subject: Re: [Shop-talk] brake shudder
From: Ronnie Day <ronnie.day@gmail.com>
Date: Sat, 27 Sep 2025 11:05:00 -0500
Cc: shop-talk <shop-talk@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <1UkSvWeRAH.3PSHGCDX72r.ref@johns-desktop> <1UkSvWeRAH.3PSHGCDX72r@johns-desktop> <CAP7dBXCPXFdZohuCOaWb6bs9+XamWB_8PzN+0EAo1MFsKxbLqQ@mail.gmail.com>
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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 <ejrussell61@gmail.co=
m> wrote:

> 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 even=
ly
> 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 <jniolon@att.net> wr=
ote:
>
>> well I carry tools in my suburban (shop content)
>>
>> Mt problem is a 2008 suburban that has always had a brake shudder (warpe=
d
>> 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
>> Donate: http://www.team.net/donate.html
>> Suggested annual donation  $12.96
>> Archive: http://www.team.net/pipermail/shop-talk
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>>
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/shop-talk/ejrussell61@gmail.com
>>
>> _______________________________________________
>
> Shop-talk@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Archive: http://www.team.net/pipermail/shop-talk
> http://autox.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/ronnie.day@gmail.com
>
>

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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:ejrussell61@gmail.com";>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=
iolon@att.net" target=3D"_blank">jniolon@att.net</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>
<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>
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<br>
</blockquote></div>
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</blockquote></div></div>

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