[Shop-talk] brake shudder

[Ronnie Day]

If the rotors don’t show significant warping, I’d check for worn tie rod
ends or problems with the rack and pinion unit itself.

On Sat, Sep 27, 2025 at 10:54 AM Eric Russell <ejrussell61 at gmail.com> 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 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 AM john niolon <jniolon at att.net> 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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