Brake Rotors - Which ones are track-worthy

Fishey · 09-26-2012, 08:38 PM

Quote:

Originally Posted by Race_Tech

Not entirely true. You dont need to have the bolts wire locked. However the AP Racing kit above does have bolts which allow you to do so if you would like. Those are the same bolts and hardware that is supplied to 70% of the Nascar field and have not seen one single failure!

AP rotors pictured above are full floating at a float of .25-.30mm and since that is the only picture posted on this thread I will assume your comments are directly related to it which I will have to point out are incorrect. This is a true full float system, it is not bolted. The second picture is a float in bell system and is even better at radial and axial float but it is not as ideal of a system on a street car because of possible excess wear on the bell.

My safety wire was to the performance friction rotors I posted about and no its not "Needed" but for a few minutes its worth the extra precaution.

Also, I am confused on how the AP rotors you posted up allow float from the angle they show no free motion at the hub that I can see and knowing AP they usually make decent stuff I am going to guess they use oval slots and a bolt with a sleeve to hold them from keeping the rotor tight. I have seen cheap 2pc rotors that are simply hard bolted to the hub clearly not a good design usually on cheap Honda type applications. (Ebay!) However, I don't see how this system allows any axial float and also the bolts will also wear on the bell/hat same as the systems I posted but they don't have the advantage of spreading the load across a larger surface like the performance friction style that I really like above and even the brembo to an extent that allow for interchangeable wear surfaces around the bolts. Clearly all rotor hats are going to see wear when you have float but I don't see how the AP is going to allow for any less wear.

I have used AP stuff before and its extremely nice stuff clearly this is a bit on the high end of there product line.

-Your Pal
Fishey

Mike · 09-26-2012, 09:03 PM

Quote:

Originally Posted by Race_Tech

Was this the Ferodo part number that you used before?

FRP3054R-N

No, I had 6 piston brembo monoblocs when I tried the ferodos.

Race_Tech · 09-26-2012, 09:06 PM

Yes like I said a float in bell rotor/bell assembly like pictured above and on the performance friction picture on the previous page allows expansion of radial and axial float through the bell vs the rotor rings. It is a different kind of approach and has its strong and weak points one of which is increased bell wear when compared to a conventional float system. AP Racing uses a bobbin system that like you have stated pushes the bell up so that it is not held tightly against the rotor ring in a rigid form like a bolted pattern would be. Also Stoptech, Brembo, Alcon all use systems which are a compromise between bolted and floating so they do not show the true benefits. Although some are better than other Brembo and Alcon. Stoptech is complete garbage as their float system is a joke and their rotor rings wear at an exponential rate when compared to Brembo and AP Racing.

Here are some close pics of the bolts, bobbins, the assembly etc.

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09-26-2012, 09:06 PM	#48 (permalink)
Race_Tech Base Member Join Date: Sep 2012 Location: Tampa Posts: 58 Drives: S4 Race Car, IS350 Rep Power: 13	Yes like I said a float in bell rotor/bell assembly like pictured above and on the performance friction picture on the previous page allows expansion of radial and axial float through the bell vs the rotor rings. It is a different kind of approach and has its strong and weak points one of which is increased bell wear when compared to a conventional float system. AP Racing uses a bobbin system that like you have stated pushes the bell up so that it is not held tightly against the rotor ring in a rigid form like a bolted pattern would be. Also Stoptech, Brembo, Alcon all use systems which are a compromise between bolted and floating so they do not show the true benefits. Although some are better than other Brembo and Alcon. Stoptech is complete garbage as their float system is a joke and their rotor rings wear at an exponential rate when compared to Brembo and AP Racing. Here are some close pics of the bolts, bobbins, the assembly etc.