bgoetz

I followed all bedding procedures and noticed this line down the center of the rotor. I figured it would go away but after 6hrs of track time it is still there and on both rotors. I can actually feel the high spot! Does anyone have any thoughts/recommendations?

the only thing I can think to try is light sanding both the pad and rotor and trying to bed them again?

yessamgerg

Thats perfectly normal and expected for AP J-hook rotor. Check out this thread below:

https://rennlist.com/forums/991-gt3-...l#post12861375

bgoetz

Nice! Thanks for the info!!

Sylvain2000

Good to know its "normal" and that it doesn't effect performance but still a downer from the J hook rotor.

Chibo

How is it a downer?

s2000ellier

wouldn't a high spot signify that the pad isn't using the full surface of the rotor?

yessamgerg

Read the post that I linked. The high spot isn't because the pad isn't wearing down that area (which would mean that the pad isn't being fully exploited), its that additional material is being added to that area building up the surface. Depending on the pad compound I've seen both a ridge and a groove in this area, depends on if the debris exiting the slot is more abrasive to the pad or the rotor.

bgoetz

FYI I had a slight groove in the pad that matched the rotor.

imstimpy

The StopTech didn't do something quite so extreme so quickly, but mine have done something similar. I'm pretty sure every Mercedes road vehicle with their cross-drilled rotors have the same grooving.