JRitt@essex

I'm thinking that you likely have something other than a disc thickness issue going on. There's no reason to believe disc thickness would impact the parking brake functionality.

Our discs are almost the exact same thickness as the OEM units. The rear OE disc we used to evaluate measured 29.92 mm. Our discs have a nominal thickness specification of 30.00 mm. The Inner Diameter of the OEM parking brake drum measures 7.089". We specify on our drawing 7.089” +/-.005”, and our production parts are all measured on a Coordinate Measuring Machine (CMM) for accuracy as part of our QC check.

Have you checked your parking brake pads for wear?

Also, we have these installed on quite a few cars at this point (some of which are literally tracked every day), and have never had a report of any parking brake issues/compatibility.

Manifold

Thanks for this info. I'll relay this to the shop that did the installation to see what they say.

JRitt@essex

No worries. If the pads aren't worn, maybe it's an electrical gremlin with the switch? Old-school mechanical parking brake levers do have their merits!

Jake951

I've seen the same grooving on other slotted rotors (mine and on other cars). It occurs at the end of the slots. At first it concerned me, but seeing it on other cars makes me believe it's normal.

Mech33

No parking brake issues here either.

Sean in Texas

God, you have know idea how much this bothered me....

Cicadas...the noise sounds like cicadas.

Mech33

I love the look of my AP rotors, except for the rust all over the non-swept parts of the iron rotor. Wish they would do a simple costing on the rotor so they looked nice everywhere!

RacingBrake

For those who are in serious tracking should consider RB's two piece rotors like Corvette Z06 guys' consensus in this thread where all major brands' are mentioned and compared.
Best 2 pc light weight rotor for grand sport...

Read more: http://www.corvetteforum.com/forums/...#ixzz3xjrMXpXV

We guarantee an even disc surface across (except spider cracks) for track application provided the calipers are in good shape*, or the disc will be replaced at no charge.

You can also search around Nissan GT-R forums and learn why RB is the most favored two piece rotors by those track guys.
*RB also has the upgrade "one piece" stainless steel pistons that never crack on you, and high temperature dust boots that can protect your seal and brake fluids here:

Front caliper; http://www.racingbrake.com/SearchRes...nsive_Search=Y

Rear caliper: http://www.racingbrake.com/SearchRes...nsive_Search=Y

Our high temperature (Blue) dust boots are also guaranteed to outperform OE (provided no contact to brake fluid), and other aftermarket boots or your money back.

RacingBrake

Upgrade to RB CCM rotors and benefited from the latest braking technology and forget all about these stated concern.

We offer a very affordable and flexible combo:

Front: RB/ST CCM (disc made by Surface Transforms)
Rear: RB light weight 2 pc

Total weight saving ~36 lbs over OE set up, yet at highly affordable price (cost fraction of pccb), and run at lower maintenance cost.

Please join discussion here:
https://rennlist.com/forums/991-gt3-...l#post12948545

TrackDays247.com

Where are the RB rotors cast, the U.S.?

ScottKelly911

not trying to be a jerk here, but what does this have to do with AP's and the OP's thread? Aren't RB's a competitor to AP's? If that's the case, then isn't it bad form to come onto a thread about AP and then start advertising RB?

TrackDays247.com

True. Lol...still never heard where the RB rotors are made. China?

Gofishracing

Learned something today. Great info.

JRitt@essex

Thank you.

RacingBrake

Our iron rotor casting are from Taiwan, CCM discs are supplied by Surface Transforms from UK.

All design, assembly and test are done in our So cal facility in Fullerton, CA, a 30 year US brake company.

We can only speak for ourselves, however you might be surprised to learn that those claimed their parts are made in US, Europe, or Japan are actually sourcing from China (whole or part), but company like Chevy of course must disclose their sourcing from China, so are you going to question Chevy's quality or their source or origin.

We believe more optional choice is always good for a consumer. Despite we have quite a few local subcontractors supply us our brake components, I still believe presenting the design and technical merits of our brake is a better approach to win customer' trust than making source of origin as a big deal.