[Shop-talk] brake shudder

[Bob Spidell]

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:
> 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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