[Top] [All Lists]

Re: Disk brake problem

To: <>
Subject: Re: Disk brake problem
From: "Nolan Penney" <>
Date: Tue, 02 Mar 2004 06:28:57 -0500
I've currently got some vehicles that are well known for rotor problems.  
Toyota trucks are well known for lug nut induces runout problems.  Volvo's of 
the hat type rotor are difficult to seat squarely and are hyper sensitive to 
dirt under the seat.  I've also had a vehicle (motorcycle) with a warped rotor. 
 Since it was steel and non vented, I hammered it back.  My Spitfire and Fiat 
were not noted for rotor warp or runout issues.

Not to disparage the author of the web article, but having worked in a test lab 
performing heat induced distortion studies of rotating discs I'm well 
experienced at how well they do not come back to zero runout after heating.  
This part and parcel of the reason brake pedal pulse can come and go.  
Sometimes the heated and expanded rotor comes back towards zero better then 
other times.

One of the big problems the author of the web article missed is the resulting 
problems of cutting a warped rotor.  This is common practice, and not a good 
one.  For what normally happens is you end up with thin and thick areas.  
Obviously this can create immediate pedal pulse issues.  But more 
significantly, heat buildup and dissipation in the rotor is unequal, leading to 
more rapid and dramatic heat induced warpage of the rotor.

The information contained in this communication may be confidential, is 
intended only for the use of the recipient named above, and may be legally 
If the reader of this message is not the intended recipient, you are hereby 
notified that any dissemination, distribution, or copying of this 
communication, or any of its contents, is strictly prohibited.
If you have received this communication in error, please re-send this 
communication to the sender and delete the original message and any copy of it 
from your computer system. Thank you. 
<<<<GWIASIG 0.07>>>>

<Prev in Thread] Current Thread [Next in Thread>
  • Re: Disk brake problem, Nolan Penney <=