shaneS4

Looking at these pictures what is the reason my pedal now pulsates dramatically during braking?

Are these small embossed rings around the rotor brake pad material deposits?

If it is pad material what should I do to correct the violent shuddering I'm experiencing during braking?

<img src="http://www.shane-potter.com/aw/images/CRW_0167.jpg">

<img src="http://www.shane-potter.com/aw/images/CRW_0170.jpg">

Jim De Arras

on a very hard brake, you may have softened the rotor metal on part, but not all, of the rotor. That would make the brakes "pulse"

YS4

warped rotor maybe?

Andy_FL

Warped rotor?

DrSmile

You can't tell from looking at the rotor whether its warped or not. From experience I've found that the rotor rarely actually warps and it is typically pad deposit causing the vibration. Just going to performance pads typically fixes the problem.

shaneS4

As I tracked the car 2 days this year. Just curious if the sensation I'm feeling is due to pad material or warpage. I know a lot of people in the archives have claimed to warp the stock rotors after a track day yet the other side of the fence seems to argue it could just be uneven brake pad material deposits.

Any litmus test on pad material versus warpage?

shaneS4

Any suggestion on what brand of pad is aggressive enough to test the pad material theory?

Jim De Arras

I would think the rotor needs replacement, but perhaps others here have experience with other solutions.

gk1

Or the other side of the rotor pictured. IMO the picture you have only tells about one quarter of the front rotor surfaces.

slvrbullit

your wheel bolts, in my case the shuddering has almost gone away after retorqing - to completely eliminate the problem I am going to replace the pads, and if its still there I'll get new rotors...