Brake rotor question

[steved0x]

Base rotors have a spec where they can be turned, S rotors can't. There is 2 mm of allowed wear per rotor before Porsche says they should be replaced. You can get an idea because there is a lip at the top of the rotor, once it gets to 1mm per side they are done.

[Hawaiian Driver]

Thanks guys, my rotors are "S" so they are probably close to being shot! Your answers are much appreciated.

[Pdwight]

70 bucks a side

Carquest Wearever Brake Rotor - Front YH145464: Advance Auto Parts

I was told Bosch made these, I have been running a set for 2+years

[flouese]

steve0x,
I don't understand the "lip" Please explain. New to the 986...still learning.

[PaulE]

Flouese, if you look at your rotors, you will likely see a very thin rusty edge at the very outside face of the rotor. The disk brake pads don't come in contact all the way to the very outside edge of the rotor, their contact ends where the shiny part of the rotor ends. The shiny part of the rotor is worn down and made thinner by the brake pads over time. The outer edge is the original thickness of the rotor and rusts due to not being contacted by the brake pad. So if that lip edge is very pronounced, it means the rotor has been worn too thin and needs to be replaced when a brake job is done.

[steved0x]

Originally Posted by PaulE

Flouese, if you look at your rotors, you will likely see a very thin rusty edge at the very outside face of the rotor. The disk brake pads don't come in contact all the way to the very outside edge of the rotor, their contact ends where the shiny part of the rotor ends. The shiny part of the rotor is worn down and made thinner by the brake pads over time. The outer edge is the original thickness of the rotor and rusts due to not being contacted by the brake pad. So if that lip edge is very pronounced, it means the rotor has been worn too thin and needs to be replaced when a brake job is done.

Exactly!

Here is a picture of a rotor lip:

Got a break wear light

From that post:



The only way to know for sure is to measure, but by feeling the lip or lack of it, if the lip is > 1mm it is time to replace the rotor.

[BYprodriver]

Originally Posted by steved0x

Base rotors have a spec where they can be turned, S rotors can't. There is 2 mm of allowed wear per rotor before Porsche says they should be replaced. You can get an idea because there is a lip at the top of the rotor, once it gets to 1mm per side they are done.

My "S" rotors have wear spec on them. Of course you can turn them, it will reduce the chamfer depth.