AP Racing Sprint kit issues
 

I got a set of AP Racing Sprint brake kit last October for my 2022 GR86. Took it to one track day before the season ended and to three track days so far this year. Aside from driving to/from the track, the car is used for track duty only. Car has 4,100 miles. Got the brakes at 2,600-2,900 miles. As I was rotating the tires yesterday, I noticed the passenger side rotor has a one inch crack.

Someone please tell me these things are supposed to last more than 1,200-1,500 miles.

If not, I may need tips on other BBKs. The AP Racing kit was great on track. I had no issues at all, but I can’t buy new rotors every three track days.

Picture?

I don’t have a place to upload them

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Without a picture it is hard to say. If it is just heat checking then it is normal. If it goes to the edge of the rotor or you can catch your fingernail on it, replace it.


https://www.essexparts.com/news-blog...-my-iron-discs

F me! $750+ to replace them after four track days and ~1,500 miles.

How do I make them last longer?

I probably should look into other brake kits.

Ugh, yes, that needs replacing. What track(s) did you run and what is your driver experience/skill level?

I don't think anyone will be able to provide much useful info without knowing what your setup is.

One day at Dominion, two at VIR, and one at Summit Point. I’ve done 20-25 track day totals. I’m not super aggressive. I engaged ABS once in the wet for the first time on Saturday.

The Essex rep suggested it is because I drove it on the street with the DS1.11 pads. But I only drove it to/from the track almost entirely on highways—not a lot of stop and go, city driving.

Will they last only 5-6 track days otherwise?

What do you meant setup?

2022 GR86.
Suspension: Tarmac2 coilovers, sway bars front and back, camber plates, rear LCA, end links.
Brakes: AP Racing Sprint kit, SS lines, fluid.
Tires: 245/40/17 RS4, 6UL 17x9 wheels.

Other than that, I have an oil cooler, some aero (splitter, spoiler, hood vents), and safety stuff (seats, roll bar, harness).

I have the Radi-CAL kit so can't speak directly to your experience with the Sprint kit but I have 10 track weekends on my rotors and drive on DS1.11 or DS3.12 pads with no problems all year round.

It sounded like the Sprint kit was good enough for HPDE days when I first looked into it. I figured a $6K kit would be overkill.

Was thinking I could move up to the 325mm rotors on the Endurance kit since it uses the same calipers but it appears they don’t sell them unless you have the entire Endurance kit.

So, sounds like I need a different BBK. Any recommendations aside from the Radi-Cal?

Gen 1 Brembos use 326mm x 30mm rotors, it is very likely that the rotors used with the Sprint kit (299mm x 32mm) are undersized for Gen 2.

The sprint kit should be plenty good enough. I would contact Essex and talk with them about it, that is not normal to only last that amount of time. None of the guys I know have issues with having to replace friction rings that often. The sprint kit is the most common kit I see aside from factory PP kit.

Can you run the 325mm without the endurance kit caliper bracket? I wouldn't think so.

That is why I was asking about setup. You could be FI and swapping to slicks for all I knew.