[Shop-talk] brake shudder

[john niolon]

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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