Sport Package Rotor Thickness

BGTV8

Dealer is FoS and a WOFTAM

Whatever the dealer showed you is the stock original thickness and not minimums.

Once worn below minimums, with repeated heat cycles, the risk of cracks from inner to outer edge followed by catastrophic rotor failure rises significantly.

That is not to say you will see rotor failure, just that the risk of that event rises substantially.

For the record, I checked on the DBA website, but the data is also in the Z34 FSM which you can see online.

ResIpsa

At the track you are more concerned about rotor cracks then rotor thickness. They start out as small hairlines in the center of the rotor surface and gradually gets longer and wider.

I have a garage full of rotors that have plenty of thickness but are just too severely cracked for me to trust them on the track.

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The Reed Law Firm; Michael Fasano VA Attorney and Counselor at Law: A Virginia Traffic, Criminal, and Family Lawyer.https://reedlawva.com/

Bshields22

Good to know! thank you,

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308 rwhp | 252 rwtq | Fast Intentions CBE 18" Res | Stillen Gen 3 CAI | EcuTek Tune | Stoptech Slotted Rotors and Sport Pads | KW V3 Coilovers | SPL Upper Control Arms & Lower Rear Arms | Seibon CF TS Hood | Vossen CVT | SPC Toe bolts

Bshields22

I checked the data online on the Z34 FSM and found the rotor specs. I see the page the dealer showed me but come to find out there was a second page. Maybe you can help clarify these 4 lines I see. Page BR-64 and BR-65 btw. No questions on rotor diameter as that is obvious.

FRONT 4 PISTON, REAR 2 PISTON TYPE
- Front brake (Rotor outer diameter x thickness) 355mm x 32mm
- Read brake (Rotor outer diameter x thickness) 350mm x 20mm


- WEAR THICKNESS FRONT ROTOR = 30mm
- WEAR THICKNESS REAR ROTOR = 26mm <---problem causing confusion

My rotor measurements:

FR: 32.2mm
FL: 31.9mm
RL: 20.2mm
RR: 20.4mm

Also, if the measurements above are "new" how are my used rotors bigger? I assume maybe because a micrometer could be slightly calibrated wrong.

Unless I am understanding this wrong how is the "wear thickness" larger than the supposedly new thickness above. Since the front rotor wear thickness is 2mm less than the new, i would assume the wear thickness from the rear would be about 1-2 yielding 18-19mm but instead these specs are showing the rear wear thickness LARGER than the new thickness

Any thoughts?

__________________
308 rwhp | 252 rwtq | Fast Intentions CBE 18" Res | Stillen Gen 3 CAI | EcuTek Tune | Stoptech Slotted Rotors and Sport Pads | KW V3 Coilovers | SPL Upper Control Arms & Lower Rear Arms | Seibon CF TS Hood | Vossen CVT | SPC Toe bolts