Stoptech OEM replacement rotors

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Apr 27, 2015 | 01:56 PM

#31

DavidNJ

Joined: Apr 2006

Posts: 1,953

Likes: 51

Quote:

Originally Posted by Sylvan

Quote:

Originally Posted by DavidNJ' timestamp='1430166442' post='23593153

[quote name='Sylvan' timestamp='1430162486' post='23593055']

Quote:

Originally Posted by DavidNJ

First...which rotors were they...and most importantly, where they floating rotors (relieving stress between the hub and rotor)? Second, where they cryogenicly treated? The rotor on the S2k can have less mass than needed on a track with significant braking. Third, where did they have ducting? While mass allows the rotor to absorb the energy from braking, cooling get the temperature back down before it heats up on the next braking event. Which track did this occur at?

They were the racing brake OEM sized 2-piece floating rotor. I did not have any ducting. I don't know if they are cryogenically treated, I can't remember. It's been awhile, but you could look it up on the racing brake website. This was at Thunderhill, and my pace was around 2:10.

Which brand where they?

With the indicated relatively light braking the failure is either installation-related or a product defect. Ducting, floating rotors, and cryo treatments are ways to avoid heavy use related problems.

I've said twice already.. The brand is racing brake.
Edit: here's the link to the product: http://www.racingbra...0-09-p/2081.htm
I was using the open-slot disk, p/n: D204-02-0381
[/quote]

Do you have a picture of the cracked rotor?

Have you examined the rotor with Spotcheck or some other liquid penetrant crack detection spray for other cracks not yet visible?

That rotor appears to be floating (the manufacturer calls it sliding) and has an unusual set of holes drilled in its rotor slots. Also, rather than have the rotor mounting tabs on one face of the rotor they have alternating tabs from both faces

Apr 27, 2015 | 02:46 PM

#32

Sylvan

Joined: May 2013

Posts: 473

Likes: 1

From: San Jose, CA

We are getting pretty far from the original topic. I posted a thread in here over a year ago probably with lots of closeup pics. Please search if you want to know more detail.

Apr 27, 2015 | 03:05 PM

#33

DavidNJ

Joined: Apr 2006

Posts: 1,953

Likes: 51

That thread ended with another poster indicating that Racing Brake may have incorrectly machined your rotor. Beyond that,. RB's drilling holes in the slot created a weak point which propagated to one of their highly offset tabs. It would appear to be a bad design compounded with a defective product.

Note, Girodisc only slots rotors, PFC doesn't even slot, it just dimples them.