http://www.racingbrake.com/TL_Rear_04_08_p/2153-381.htm


thx

 

short answer - probably to most likely yes

Long drawn out, everyone thinks they're a brake expert, forum discussion that will probably ensue here - maybe/maybe not lol


Rotors are larger and are vented/slotted and with a decent set of pads it's pretty easy to see that your braking would be improved.

I'd buy this kit fwiw

 

probably not. just because you might need to upgrade the positional valve/master cylinder so that it gets the right amount of fluid.

Ill try to find the post where BBK actually gives you worst braking distance. Only good for track abuse because larger surface area= more cooling

 

I don't understand how that works.

If I read it correctly, they don't increase swept area since you're using stock sized pads. And "moving" the pad inward on the larger rotor, I don't see how you get much if any "lever arm" gain.

(edit: wait, I think I get that you can get some leverage advantage; but still no increas in swept area.)

I get the part about more mass and ventilated is better for cooling. Although for rear brakes, I'm not sure how much of an issue that is.

I get that lighter weight in rotating mass is good.

I don't get how the ventilated rotor fits in the stock-size caliper though. OE is 9mm thick, these are 17mm. Confused by how that works, fitment-wise.

And $1700+. That's a lot of $$ for, I think, limited (if any) gain.

I like RB products - I'm running their pads in both the '07 and '02 and their OE replacement rotors in the '02. I'd love some 2-piece rotors up front on the '07. So I'm not "trashing" the company. I just don't understand quite how this works and why this worthwhile.


Edit 2: Maybe I've got it wrong though. Can someone explain why this improves braking force with stock sized pads?

 

okay guys, keep in mind that your braking is currently limited by your tires. unless you have some tires for track use, then your bottleneck will always be the tires. honestly, you will not stop any quicker with only upgrading brakes because the stock brakes are more than enough to make abs kick in. upgrade your tires, and your tires will grip and abs wont kick in so often so you will actually be able to brake harder. however, upgrading brakes WILL allow you to brake for longer with better cooling and withstand more heat, but for 1 single stop, it will not help.

 

Absolutely true on the BBK being all about endurance. The real performance of a kit like this would come in after many hard braking attempts where stock brakes would be completely dead. Although many will say that the TL has that electronic proportioning valve and that it would adjust for the difference.

Again absolutely true. Tires are just as critical to braking as the brakes themselves. This is why I find it crazy that people buy 600 treadwear runflats for their cars. Yeah they're get over time and help you out with a flat but other than that, they are pretty much horrible.

 

If you read closely, it says that you can't run stock pads on this kit, for the exact reason you pointed out. Since the rotors are essentially twice as thick, the pads they give you probably have half the amount of pad on them. Probably not a huge deal but I bet they tried this kit with a thinner rotor and it didn't do much for performance so they were kinda stuck sacrificing the amount of pad for the thicker rotor.

And the most this kit would cost is ~$1400 with the hawk race pads and the rear brake lines. (which for me would be the only setup that makes sense really)

Finally, I think it's pretty easy to see how even moving a stock sized pad out away from the center of rotation would provide better braking. Yeah the pad isn't the size of the Brembo pad up front, but at least the rear rotor would now be larger than the fronts lol.

 

You're right, I missed that note in the "this kit includes section":


But I did see this, which is wht confused me:




You're right. I mis-read the price. It's $1175, not $17xx.



Yeah, I got the leverage thing (my first edit), so I see that advantage.


Anyhow, thanks for clearing up the bits I missed/mis-read.

 

Does it actually?

 

Heard many say it does including IHC if I remember correctly. I honestly would prefer a manual one that I could adjust in the car while on track but that's more of a dream than anything.

 

ok racing have two kit one with 328mm disk and 307mm !! same thickness pads !!

second kit :http://www.racingbrake.com/TL_Rear_04_08_p/2152-381.htm

-200$ for 21mm less weird but big brake rear for 999$ with ET 500 pads !!!!!

pads life ... probably better that oem

thanks all for comments

 

here's a real rear upgrade for a good price

http://www.fastbrakes.com/product_p/...ear%2012-4.htm

 

Some great posts in this thread. I never got to the bottom of what the EBFD does or does not do. It still bugs me ,even after buying a few white papers I have no solid conclusion.

I'm a little scared to throw on a different brand rear BBK with unknown piston area, not knowing how it's going to affect the bias. It could actually hurt one stop stopping distances. In my case, knowing I've probably increased front bias over stock with my 13" BBK, I will probably try this kit out. But again, one of the great unknowns is the EBFD. Luckily I have measured stopping distances on these tires with stock brakes so I can directly compare.

On to swept area, it makes no difference in performance. Having more swept area can lead to longer pad life but at a given master cylinder pressure, stopping force will be the same no matter what the swept area is.

Lever arm is important along with piston area for determining brake bias but there's ample braking power to lock the tires so it's not something to concentrate on.

My ideal BBK would be one that uses larger rotors for heat dissipation but less piston area so that you break even in overall braking force and don't disturb bias. I believe Racing Brake does this.

 

I would think more swept area ought to keep the pads cooler for a longer period, plus you get better modulation up to peak braking torque. You get more pedal feel out of both below the extreme. At least, that's been my experience.

 

Modulation is determined by the pad composition, the higher end pads will list the hold and release characteristics. You are right, larger pads can run cooler and dissipate heat quicker but from the papers I've read, it's very insignificant since the rotor does the vast majority of the dissipation.