demoray Posted November 6 Share Posted November 6 I'm working through the process to get my new-to-me 2013 CSR 260 inspected in Maryland. The inspection shop requires I provide them brake disc specs from some sort of official (-ish) fashion, which are unfortunately not stamped onto the rotors. Does anyone happen to know the specifications of the rotors used? My forum search skills appear to be lacking. Link to comment Share on other sites More sharing options...
Croc Posted November 6 Share Posted November 6 If they are vented fronts then they are AP Racing. I have an unused set in their box which I can take photos of tomorrow. Link to comment Share on other sites More sharing options...
MV8 Posted November 6 Share Posted November 6 I don't know what brakes are installed on your cat, but it sounds like rotors that are "racing only". If it has basic brakes, the rotors would likely be for a '70s Triumph Spitifire and should have discard limits on the inboard side of the hub: https://www.rockauto.com/en/moreinfo.php?pk=1278968&cc=1279919&pt=1896&jsn=397&_nck=RaosfcaC2rGsyaDO5wlVVEZqgf1rMDVjY0i1RdkJs5pvjGfBKOiwpBt27aYgFrhIDezeZhyXxNlVlnNbAlN%2BBOyHtTLpKKLXavhQbhyfuDuEkbeHQsa94SioLryDREgOWlHG079ZdJv4BM29IUxbW4dcATsheQZYxX%2FR%2Fq0Jqd1qDAvgU%2FOrBP3D7pVyI2XGk46KhyxqVKPXP1c5wH9Pz4NhhwTmInKPYAuvkjL68HSJIq0%2FZ%2B4kIs1uTh9kFcUctudkhZVngW68ZX09xR1vYtsZ%2B75hxGJgB6LAcx3rdrWx9IQ9f86ADQ%3D%3D Brake wear limits are not provided in the owners manual and usually only indicated on the rotor itself. You could replace a few components to fit standard model, road legal rotors. Link to comment Share on other sites More sharing options...
Croc Posted November 7 Share Posted November 7 Front vented discs Rear standard non vented discs. The parts numbers in those photos are the AP Racing parts numbers. Normally if you go to the AP Racing website you can search for tech specs by part number - these did not come up likely as Caterham have a proprietary agreement with AP Racing. I bet you could ring AP Racing and talk to someone to get what you want. The catalog may list these part numbers but I did not read through the 130 pages to prove it. Link to comment Share on other sites More sharing options...
FE07 Posted November 7 Share Posted November 7 Posted June 12, 2005 The thickness info is AP vented Front disc 18 mm thick new replaced at 16.4mm Hants (North) and Berkshire Area club site here My racing info site here Above is what I found online. That is all the guys who inspected mine wanted when they signed my car off. Jim Link to comment Share on other sites More sharing options...
MV8 Posted November 7 Share Posted November 7 Apparently, this information is stamped on the outside edge of the disc. I know Brembo etches their rotors. Scrub it. https://www.caterhamlotus7.club/forums/topic/226867-ap-brake-disc-thickness-cp3707-103p/ Link to comment Share on other sites More sharing options...
demoray Posted November 9 Author Share Posted November 9 The rotors on my 7 are not vented/slotted. But... with the guidance you all provided, I found the model number by carefully cleaning the outside edge of the rotors. Combined with knowing to look through AP Racing's catalog, I hopefully will be able to find the specs. In case others have this issue, here are the photos I took of what information is stamped onto the edge. Link to comment Share on other sites More sharing options...
MV8 Posted November 9 Share Posted November 9 (edited) I think I have the answer for the inspector. Unlike oem discs on mass produced vehicles which are intended to have a long service life, these discs are specially designed and heat treated for racing and are never to be machined/turned or have a similar length service life. There is a wear limit. It is the nominal specification in the catalogue. Any thinner and they must be replaced. Not repairable by machining thinner. There are also carbon discs but they do wear thinner with use and have built in wear indicators, similar to tires. A "vented" rotor refers to radial holes/gaps between solid inboard and outboard friction surfaces. You have vented front rotors. The drilling and slotting of friction surfaces is something else and is sometimes done to solid or vented rotors. Edited November 9 by MV8 Link to comment Share on other sites More sharing options...
demoray Posted November 11 Author Share Posted November 11 I got the following from AP racing this morning. -- Hi Brian, Minimum thickness are 16.5mm for CP3707-103P and 7.5mm for CP6660-104P. Regards The AP Racing team Link to comment Share on other sites More sharing options...
MV8 Posted November 11 Share Posted November 11 (edited) I suggest asking AP for the reference document or a way to access it online for future inspection and maintenance. Carbon discs aside, I found nothing about rotor wear limits in their catalogue. It may be best to say, I contacted the manufacturer who provides these specifications. However, if there is any damage to the surface that would require turning, I would have the rotors are replaced". Edited November 11 by MV8 Link to comment Share on other sites More sharing options...
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