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Re: [Shop-talk] brake shudder

To: eric@megageek.com ffwc5VJPi0pFfGLgqd3tmB1lq/7yP5R8mzPF6Jd6KUUBu+ffw2JuJX5CUGth3B8Gq6tHqauPhpl A7AGbZr+/u/m4RIy4CltzwhzY8OLzC7oa8QbpWOFcdcZi/hXEDJozwmV3Jy6fI7YUpJNhtrbOqz LMUfvGykQu3B4C4MQKHIvBdZp7xR5qQoy1vvyQyMkaBXVeZkLdvv970X47laD6DVl5YONu+EySL cxHsIQmmHOLuOg38T3A1CNFvkzwMXBahq9BqcRkKuKZpE4v7b+GzkR+3ZSNwx327wXPuXE1ow= engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-27_06,2025-09-26_01,2025-03-28_01 phishscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 malwarescore=0 spamscore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.22.0-2506270000 definitions=main-2509270176
Subject: Re: [Shop-talk] brake shudder
From: Pat Horne <patintexas@icloud.com>
Date: Sat, 27 Sep 2025 13:19:47 -0500
Cc: Shop-talk@autox.team.net
Delivered-to: mharc@autox.team.net
Delivered-to: shop-talk@autox.team.net
References: <OF25009E9D.148B386B-ON85258D12.005AE58B-85258D12.005B2656@mail.megageek.com>
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Something just came to mind. The O.P. Stated that he measured a maximum devi=
ation of .002=E2=80=9D. How was that measurement taken? It could have been t=
he measurement between one surface of the rotor to a part of the car that is=
 stationary, or the thickness of the rotor. Variation in the thickness of th=
e rotor will produce more variation in the pedal than a warped rotor.=20

As for not turning rotors any more, a local, highly regarded shop says to tu=
rn older rotors, especially OEM rather than replacing them with aftermarket r=
otors because the steel quality of old rotors was better.=20

Peace, Pat

Pat Horne=20
We support Habitat for Humanity


On Sep 27, 2025, at 12:24=E2=80=AFPM, eric@megageek.com wrote:

=EF=BB=BFJohn,

A couple of things, I didn't think you turn a modern rotor. There normally i=
sn't enough 'meet' to remove them and have them be stout enough.  I think th=
at 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 ove=
r?  What about pot holes?  I always learned that braking while going over la=
rge 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)
=20
Mt problem is a 2008 suburban that has always had a brake shudder (warped ro=
tor) problem since I've had it... every year it seems it's
replace rotor time.
=20
This year I know I had two  never turned rotors.  I put a dial indicator on r=
otors 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 drive=
 was thru the neighborhood with no shudder.
Second drive was a ten mile trip on freeway... when exiting freeway I felt t=
he 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 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 shu=
dder so that eliminates the rear rotors causing the
problem.  Pads look nearly new and fit in the caliper nicely... Caliper pist=
ons 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.
=20
any ideas/suggestions/true life experiences/fantastic tales ???
john_______________________________________________

Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archi=
ve

ageek.com



_______________________________________________

Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archi=
ve

as@icloud.com


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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Something just came to mind. The O.P. State=
d that he measured a maximum deviation of .002=E2=80=9D. How was that measur=
ement taken? It could have been the measurement between one surface of the r=
otor to a part of the car that is stationary, or the thickness of the rotor.=
 Variation in the thickness of the rotor will produce more variation in the p=
edal than a warped rotor.&nbsp;<div><br></div><div>As for not turning rotors=
 any more, a local, highly regarded shop says to turn older rotors, especial=
ly OEM rather than replacing them with aftermarket rotors because the steel q=
uality of old rotors was better.&nbsp;</div><div><br></div><div>Peace, Pat</=
div><div><br></div><div><div dir=3D"ltr">Pat Horne&nbsp;<div>We support Habi=
tat for Humanity</div><div><br></div></div><div dir=3D"ltr"><br>On Sep 27, 2=
025, at 12:24=E2=80=AFPM, eric@megageek.com wrote:<br><br></div><div dir=3D"=
ltr">=EF=BB=BF<span style=3D" font-size:10pt;font-family:sans-serif">John,</=
span>
<br>
<br><span style=3D" font-size:10pt;font-family:sans-serif">A couple of thing=
s,
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=3D" 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=3D" 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=3D" font-size:10pt;font-family:sans-serif"><br>
Have a great day.</span>
<br>
<br><span style=3D" font-size:10pt;font-family:sans-serif">Moose</span>
<br>
<br>
<br>
<br><span style=3D" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:=

&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D" font-size:9pt;font-family:=
sans-serif">"john
niolon" &lt;jniolon@att.net&gt;</span>
<br><span style=3D" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D" font-size:9pt;font-family:=
sans-serif">"shop-talk"
&lt;shop-talk@autox.team.net&gt;</span>
<br><span style=3D" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date=
:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D" font-size:9pt;font-family:=
sans-serif">09/27/2025
10:59 AM</span>
<br><span style=3D" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subj=
ect:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D" font-size:9pt;font-family:=
sans-serif">[Shop-talk]
brake shudder</span>
<br><span style=3D" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent=

by: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D" font-size:9pt;font-fam=
ily:sans-serif">"Shop-talk"
&lt;shop-talk-bounces@autox.team.net&gt;</span>
<br>
<hr noshade=3D"">
<br>
<br>
<br><span style=3D" font-size:12pt;font-family:Segoe UI">well I carry tools
in my suburban (shop content)</span>
<br><span style=3D" font-size:12pt">&nbsp;</span>
<br><span style=3D" 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=3D" font-size:12pt;font-family:Segoe UI">replace rotor time.=
</span>
<br><span style=3D" font-size:12pt">&nbsp;</span>
<br><span style=3D" 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=3D" font-size:12pt;font-family:Segoe UI">them turned just
to see what difference it would make. &nbsp;</span>
<br><span style=3D" font-size:12pt">&nbsp;</span>
<br><span style=3D" font-size:12pt;font-family:Segoe UI">Took them to a repu=
table
shop that turned them and reinstalled. &nbsp;First drive was thru the neighb=
orhood
with no shudder.</span>
<br><span style=3D" 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=3D" font-size:12pt;font-family:Segoe UI">the rotors...</span=
>
<br><span style=3D" font-size:12pt">&nbsp;</span>
<br><span style=3D" 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=3D" 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=3D" font-size:12pt;font-family:Segoe UI">problem. &nbsp;Pads=

look nearly new and fit in the caliper nicely... Caliper pistons are retract=
ing
as the should (pads are not bound to rotor when</span>
<br><span style=3D" 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=3D" font-size:12pt">&nbsp;</span>
<br><span style=3D" font-size:12pt;font-family:Segoe UI">any ideas/suggestio=
ns/true
life experiences/fantastic tales ???</span>
<br><span style=3D" font-size:12pt;font-family:Segoe UI">john</span><tt><spa=
n style=3D" font-size:10pt">_______________________________________________<=
br>
<br>
Shop-talk@autox.team.net<br>
yle=3D" font-size:10pt">http://www.team.net/donate.html</span></tt></a><tt><=
span style=3D" font-size:10pt"><br>
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