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GT4 Brake and rotor questions.

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Old 10-19-2018, 02:12 PM
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porci944
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Default GT4 Brake and rotor questions.

Hi.All
I got 2016 GT4 with 10,000miles on it. I need a new pad on front axle. Rear looks like almost brand new. When I take to my dealership I was told that I need a new set of rotors with a new pad. Is that true? I did about 9 track days but rotor seems fine just minimal rip at the edge.
I know a guy used the same original rotors for 50,000mile(I do believe he has the highest mileage on GT$ in the world.....now 78,000miles). At least whole price was $2,900 including new pads (I think it wasn't bad)
Any advise?
Old 10-19-2018, 11:19 PM
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MrMoose
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Minimum thickness is stamped on the rotor. You can measure the rotors with a caliper to determine whether they are usable or not. If they’re thick enough and not warped or excessively scored you can just swap in new pads.

I generally get two pad changes on a set of rotors on the German cars I’ve owned.
Old 10-21-2018, 03:45 PM
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bernb6
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Most/all track guys I know get several or more pad sets per rotor set. I've heard Porsche dealers are a bit **** about changing rotors when they change pads. Perhaps that's because the car gives a warning when the pads wear to min thickness but there is no warning for the rotors. Keeping an eye on the ridge at the rotor edge tells you all you need to know. I don't know how the GT4 rotors compare with standard CS' but Sebro slotted rotors are now available for the 981 CS, are less expensive than OEM, and last longer.
Bern
Old 10-25-2018, 11:48 AM
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Bill Lehman
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I've got 42 track days on my GT4 rotors. Lots of heat cracks but none connect or migrate to the edge. Thickness is O.K. I'm an Instructor, PCA Tech Inspector, and late braker.
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Old 08-02-2023, 01:51 PM
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DomTheBomb
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Originally Posted by Bill Lehman
I've got 42 track days on my GT4 rotors. Lots of heat cracks but none connect or migrate to the edge. Thickness is O.K. I'm an Instructor, PCA Tech Inspector, and late braker.
Are you running stock pads and rotors?
Old 08-02-2023, 03:34 PM
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KNSBrakes
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Are you on Iron or PCCB rotors?

Post a picture of your rotor.

--Aaron
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Old 08-02-2023, 03:41 PM
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Clark-ApexPerformance
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Don't listen to the dealer......you absolutely do not have to change rotors every time you change pads. Always remember the more parts they can sell you is more money for them.
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Old 08-03-2023, 09:42 PM
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aryork
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Agree. If you have OEM rotors (cross-drilled) then small cracks extending beyond the holes are fine as long as they do not go to the free edge of the rotor and do not go to another hole.
Old 08-04-2023, 01:29 PM
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bldn10
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"Are you running stock pads and rotors?"
No one runs stock pads on the track. At least not for long.
Old 08-04-2023, 01:31 PM
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aryork
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Originally Posted by bldn10
"Are you running stock pads and rotors?"
No one runs stock pads on the track. At least not for long.
I ran OEM pads for a long time. They are actually not horrible.
Old 08-04-2023, 04:08 PM
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KNSBrakes
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The OEM pads are decent, just wear fast.

I'd compare the stock pads (non "copper free") to the Ferodo DS2500's.

They work, but wear fast.

--Aaron
Old 08-04-2023, 07:08 PM
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suzuka_joe
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best aftermarket brake pad for 85% street, 15% track?

Steel brakes
Old 08-04-2023, 09:11 PM
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Nate Tempest
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Originally Posted by suzuka_joe
best aftermarket brake pad for 85% street, 15% track?

Steel brakes
Mine's more of a 85% track, 15% street, but I've been loving the Ferodo DS3.12 so far. They're fantastic on the track; zero fade, seem to wear well, and so far I've only had tiny amounts of occasional squeaking on the street - not the screeching I've experienced with other track pads in the past. That said, I've only run them for two track days and a few hundred miles if that so far, so can't speak to their whole life performance. (Though I have seen them recommended by others as well.) Only downside is they're expensive.
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Old 08-04-2023, 11:46 PM
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Five12Free
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Originally Posted by suzuka_joe
best aftermarket brake pad for 85% street, 15% track?

Steel brakes
the stock pads
Old 08-05-2023, 08:58 AM
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Originally Posted by suzuka_joe
best aftermarket brake pad for 85% street, 15% track?

Steel brakes
Hands down Ferodo DS2500

--Aaron


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