Brake shudder

[Irwin]

In one of the past threads I stated I had warped rotors in my brand new rwdr "c" that the dealer replaced before I bought the car

[DZeckhausen]

Originally Posted by DanRealtor

My Q45: 154 mph, heavy car, stock brakes, had "Warped Rotors" on several occasions (also boiled the brake fluid numerous times).

Different brake pads have different failure modes when pushed way beyond their maximum operating temperature (MOT). For example, Pagid Orange race pads will be consumed rapidly when they exceed 1200 degrees F, but they last a long time at temperatures just below that. Other pads are notorious for laying down big blobs of transfer layer ("pad poop") on the rotors, resulting in judder problems. Likely that was the case with your Q45 pads.

Most street pads are not appropriate for heavy track use. The typical street pad has a MOT between 700 and 900 degrees F. The Performance Friction 01 race pads used by many of my customers and top race teams have a MOT of 2,000 degrees F.

Most track pads are not appropriate for street use because they are noisy and dusty until they reach at least 300 to 400 degrees F. Below that temperature, they are very abrasive and tend to chew up rotors. It's clear from the pad discussions on the SRT8 forum that DCX loaded up those Brembo calipers with pads more suited to the track than to the street.

You may find the following article I wrote on judder problems at the track to be interesting: http://www.zeckhausen.com/avoiding_brake_judder.htm

[DZeckhausen]

Originally Posted by Irwin

In one of the past threads I stated I had warped rotors in my brand new rwdr "c" that the dealer replaced before I bought the car

If the car had a judder problem right from the start, it's possible the rotor was manufactured out of tolerance. If the problem developed after driving some number of miles, then it was likely due to uneven pad transfer on the rotors. Had someone bedded the brakes properly, it might not have happened.