paver

My local dealership and I would guess most others aren't really objective when it comes to tech inspections and rotors. They just want to sell you new ones.
I've had rotors look worse than that after three-four days.

R.Deacon

C2Spin,

assuming no other issues from your pics , I suggest you find a PCA independent TECH inspections

shop , I believe your good to go for quite few laps yet on those rotors , like 50% done now .

Have fun

rm21

Your rotors look fine. I've had a local Porsche dealer try to sell me rotors every time I replace pads. You just need to say no.

911rox

Looks like they are applying the Porsche textbook 7mm crack reasoning... Those look pretty good for a few more days... Just monitor for cracks running towards edges or those looking to meet up with other cracks.

I pulled mine off a little prematurely and at that point they had cracks 10-12mm long...

mmm951

Brembo, which makes the rotors for these cars, uses a two dimple system which allows you visually inspect the rotor wear. You will always see two dimples near each other. When the first dimple disappears it indicates 80% of the usable disc surface has been worn. The second hole is drilled .2mm less deep than the minimum thickness of the disc. When it disappears, it is time to change the disc. This really helps when you have to undergo tech inspections at the track and the discs can be visually checked out.

That said, you should always measure them in order to get an idea of how many brake pad sets you can run through a set of rotors.

est8esq

OMG?? For goodness sakes, your rotors don't even look like they've been broken in, let alone need to be replaced?

Forget about replacing rotors? That's too obvious and hopefully, fellow RL'ers have convinced you they don't replacing.

Given the number of track days you've run, coupled with the condition of the rotors I think you should work on higher threshold braking. You're car has a LOT more in it and I might respectfully suggest you're not coming close to this car's capacity

C2Spin

Thanks everyone for the valuable feedback. I will have a conversation with SA tomorrow and let you know the outcome, and based on recommendations I plan to say 'no' push back on rotor replacement unless they can show me something not visible in the pictures I shared.

est8esg: yeah, you're probably accurate in your assessment - higher threshold breaking. Something I plan to work on at the next event. Go in deeper and harder......that's what she said.

TRAKCAR

Forget the rule of little cracks from holo to hole to to the rotor edge means it needs replacing. Maybe that's when you order a spare set for backup.

Only when it cracks THROUGH you need new ones and even on those I have finished many weekends.

C4SGRPDK

how about these cracks, do you think the rotors have more life?

they are PFC front rotors in 34mm spec for a 997.2 GT3 RS and I used PFC 08 pads. This is after 10-12 track days.

There're no crack going to the edge.

orthojoe

That is what the brembo type 3 rotors looked like on my spyder after 12 days. I opted to replace the rotor rings at this point because of how long and wide the cracks were. Some may disagree, but I chose to change rotors at that point rather than worry about it.

Nodrip

I heard that if a crack can catch your fingernail, you should replace them...
And your cracks looks quite wide "C4SGRPDK"...

FastLaneTurbo

I replaced OEM brake fluid with Castrol SRF. Replaced OEM Pads for first time @ 10,000 miles - 16 track days. Surprise: Fronts showed only 40% wear - 60% thickness remaining. BTW, Porsche advises new pads require new Caliper Bolts on our brakes. Makes certain your shop has them in stock before replacing.
At 11,000 miles Steering Judder under braking started. Front Rotors measurements showed excessive runout. Replaced Front Rotors only @ 11,000 Miles ($2,500) due to runout. Front rotors also showed cracks (as most all Porsche Front Rotors do) Rear rotors looked fine with no cracks. Solved the problem. I replaced with Porsche OEM pads and Rotors as I'm satisfied with their performance.

Secrets to Fast Driving: Walter Rohrl " Move Steering Wheel as little as possible"
Juan Manuel Fangio: "More Gas, Less Brake" My 3: "1. Smooth, 2. Smooth, 3. Smooth"

TRAKCAR

They could look like that after just 4 hard, hot days. I'd guess they are at 50%. Just cool them after the session and they might last another 10 days.. Off course it can take only 1 red flag to crack them..

C4SGRPDK

Originally Posted by C4SGRPDK View Post
how about these cracks, do you think the rotors have more life?

they are PFC front rotors in 34mm spec for a 997.2 GT3 RS and I used PFC 08 pads. This is after 10-12 track days.

There're no crack going to the edge.


They are now at 32.5mm at the lowest

KA MOTORSPORT

The discs need to be replaced only when the cracks actually reach the ID or OD of the disc. I would pull the discs off the car and check the inboard sides of the discs. The inboard disc temps can sometimes be hotter during track use and there could be cracks that could compromise the disc.