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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. <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. </div><div><br></div><div>Peace, Pat</=
div><div><br></div><div><div dir=3D"ltr">Pat Horne <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. 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? 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.</span>
<br>
<br><span style=3D" font-size:10pt;font-family:sans-serif">I'm just throwing=
these out there. 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:=
</span><span style=3D" font-size:9pt;font-family:=
sans-serif">"john
niolon" <jniolon@att.net></span>
<br><span style=3D" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=3D" font-size:9pt;font-family:=
sans-serif">"shop-talk"
<shop-talk@autox.team.net></span>
<br><span style=3D" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date=
:
</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:
</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: </span><span style=3D" font-size:9pt;font-fam=
ily:sans-serif">"Shop-talk"
<shop-talk-bounces@autox.team.net></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"> </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"> </span>
<br><span style=3D" font-size:12pt;font-family: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</span>
<br><span style=3D" font-size:12pt;font-family:Segoe UI">them turned just
to see what difference it would make. </span>
<br><span style=3D" font-size:12pt"> </span>
<br><span style=3D" font-size:12pt;font-family:Segoe UI">Took them to a repu=
table
shop that turned them and reinstalled. 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"> </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.
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. 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"> </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>
Archive: </span></tt><a href=3D"http://www.team.net/pipermail/shop-talk"><tt=
><span style=3D" font-size:10pt">http://www.team.net/pipermail/shop-talk</sp=
an></tt></a><tt><span style=3D" font-size:10pt">
</span></tt><a href=3D"http://autox.team.net/archive"><tt><span style=3D" fo=
nt-size:10pt">http://autox.team.net/archive</span></tt></a><tt><span style=3D=
" font-size:10pt"><br>
<br>
ions/shop-talk/eric@megageek.com"><tt><span style=3D" font-size:10pt">http:/=
/autox.team.net/mailman/options/shop-talk/eric@megageek.com</span></tt></a><=
tt><span style=3D" font-size:10pt"><br>
<br>
</span></tt>
<br>
<br>
<span>_______________________________________________</span><br><span></span=
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