I will be replacing the stock front brake system on my 2008 CTT, which is 6 Piston Calipers and 14.49" (368mm) brake rotors (correct me if I’m wrong), with Brembo GT 6 Piston 405 mm Big Brake Kit very soon.

Is it possible to fit the stock 368 mm front brake rotors and 6 piston calipers to the rear as upgrade? Has anybody tried it? It seems logical to me if the fitment could be done by some minor fabrication work.

My second question is about fitting 997 Carbon Ceramic Brake System to 957 CTT. I just found today a set of nice used 997 Carbon Ceramic brake kit off a 997 Turbo including all front and rear calipers, rotors, pads, brake lines, sensors, etc. Is it possible to fit the 997 Turbo Carbon Ceramic brake calipers and rotors to 957 CTT? What kind of fabrication would it require?

Thanks.

 

You can't just simply bolt up different brakes, or brakes from another car. Sure, they'll fit, but you're braking won't be nearly as good. The car is setup to have a certain brake bias, which ends up being a function of rotor size, caliper (both in force and piston area), coefficient of friction in the pads, and the master cylinder. This is not arbitrary, but spec'ed specifically for the cayenne given it's weight distribution and how much weight transfer occurs during hard braking. So, if you actually wanted to upgrade the brakes, and wanted that to translate into better braking, you would need to run some calculations to make sure the brake force is still balanced.

If all you want to do is fill out the wheels with bigger brakes, and don't actually care how the car brakes, then by all means.......

 

Bla, bla, bla, no actual contribution, no technical information. Who said anything about simply bolting up brakes from another Porsche? The only thing you have to say is that I would need to run some calculations. "Some Calculations"...

What is the difference between the OEM Porsche 410 mm 2 piece Carbon Ceramic brakes with 6 piston calipers offered in Panamera Turbo and Cayenne Turbo? Exact dimensions, exact rotor size, exact number and size of pistons. Just the mounting is a little different. You just have to be you, right?

If you read my post, I'm already in the process of upgrading the front brakes to Brembo GT 405 mm 2 piece rotors with 6 piston calipers (from the stock 368 mm). So I was thinking a way to actually balance the brake distribution by fitting the stock front calipers and rotors to the rears as an upgrade.

Porsche OEM brakes are probably the most common brake conversions fit on other brand cars as upgrade. I guess nobody has run "Some Calculations"..

 

People have run detailed calculations when retrofitting porsche brakes to other cars. If you knew what the actual brake torque was for what you're retrofitting to the front, you'd know whether or not you need better brakes in the rear. The brake force from the calipers on carbon ceramic brakes might not actually be that much higher than the OE calipers, but obviously substantially more fade resistant as a whole system. So, knowing what the actual brake torque is with the new setup, and you'd know whether you need more torque in the back, and if that just requires different pads, or if you actually need a caliper capable of more force. This nice chart is from ECS tuning, but the math behind it is used in a lot of automotive circles.

You never said why you wanted bigger brakes. Are you getting fade? You hoping to stop in a shorter distance? Do you just want to fill up the wheels with as much brake as you can? You can get massively powerful brakes that will stop shorter (if you have the rubber to do it), but might fade faster, and you can get brakes that are almost immune to fade, but are just as strong as OE brakes. And, you can get strength and fade all in one sweet package. Often times, good fluid and different pads can get you the fade resistance you're looking for. But, if you want actual help, you need to tell us a bit more about what issue you're looking to solve.

 

why you think that, TT VIPER? )))

rear brakes is REAR. first of all rear brake disks have inside handbrake, and since this are different shape. so in case of such conversion you will lose handbrake. next thing is dimension called on wheels ET - it is different front and rear, so frond disk can touch something then in place - like dust cover. and last thing you will need custom made caliper adapter for fitting front to rear - to replace original one, and fabricating this also can be problem because of ET.

about 997 ceramic - ET, ET, ET. disks will touch steering knuckle. next thing - they are same dimentions front and rear - you said you care about correct brake distribution ))) and calipers do NOT have adapters so you will need re-machine calipers to exact dimentions and make adapter - and geometry can say that this is not possible.

about panamera ceramics - also ET is different. FYI even panamera wheels didn't fit cayenne without adapters.

of course you can mill somewhere from aluminium new centers of ceramic disks to fit cayenne and bolt them to panamera or 997 rotors. then buy (panamera) rear calipers and make adapter to fit them. but don't forget that ceramic disk is thicker than metal, and require special brakepads.

 

 

My issue with the stock brakes are
1. Stopping distance not enough
2. Fade (almost instant after 2 or more hard brakes)
3. Quick loss of performance after couple hard brakes
4. Squeal
5. Too much brake dust


I hope the Brembo GT 405 mm Big Brakes will solve most of the stopping distance and fade problem. For the rears, it would be nice to increase the bite force a little bit and also have less dust. Also, it would be nice if I could find cross drilled rotors for the rear to go along the fronts.

Having said that, maybe I could increase the braking performance of the rear brakes by simply changing the pads with more aggressive ones. Squeal will be the biggest issue with aggressive pads.

Do the 2008 Cayenne Turbo and 2009 Cayenne Turbo S have the same Rear brakes? Is there an OEM upgrade available for the rears?

Also, are there any cross drilled rotors that would fit the rears?

 

yes, the same. only upgrade is ceramics. you can buy ceramic kit from new cayenne, and only issue will be remachining rear calipers and make adapters to them. porsche number 95804460500

 

1. This will come down to the tires. The OE brakes are plenty strong to lock up the tires at just about any speed. So, keeping the ABS from engaging is what will decrease your braking distance, and this is going to come down to the tires not giving up traction.

2. I'd look more into retrofitting a whole 2009 or 955 CTTS brake setup. The larger caliper and bigger 2-piece rotor are both strong and much more fade resistant. I haven't heard of too many people stating they get fade on that brake setup, short of full on track duty. But, even then I'd suspect different pads and good fluid would fix that. AFAIK - the 2008 CTT has the same brakes as the 955 CTT, but the 2009 CTT came stock with the same bigger brakes as the 955 CTTS.

3. For general performance, usually better pads and a higher rated brake fluid that doesn't boil right away helps.

4. Mine don't squeal. Might just need some anti-squeel compound on the back of the pads, and re-bedding them.

5. Yeah - that sucks. Different pads will fix this. I don't know which ones, but I know there are pads out there that will accomplish this.

The larger brakes on the 09 and 955 CTTS are bigger - front and rear.

 

no, no, and partly no - 955ctt and 955cttS have different rears, 957 are bigger and same

 

Is that the front or rear ceramic brake on the cayenne in the picture? I see there is 315/25 tire on that wheel. Do you know what the offset of the wheel is?

For my brakes, I guess I will stick with the stock calipers and stock size and only upgrade the rotors with cross drilled ones and pads with more aggressive ones.

Do you have any info or experience on which pad gives good fade resistance, more stopping power and less brake dust?

 

Right, 955 CTTS has bigger brakes front and rear than the 955 CTT. I'm almost 100% sure the 2008 957 has the standard sized brakes (same as 955 CTT), and it wasn't until 2009 that the CTT came stock with the bigger 2-piece brake setup.

I'm sure that would be easy to confirm. It was the only reason I considered a 2008 CTT since I couldn't fit 18" wheels on the 2009 CTT.

 

of course it is front )))
r22 have et50. on photo r23, et don't remember, maybe later
my friend with 405 brembo uses ferodo 2500 racing. he uses 380 brembo at rear

 

315's in the front? Hell, yeah. )) You got to learn me the width and offset of that wheel? There is no way ET 50 will work in the front. Maybe they are ET 40 or lower.

I've already ordered the Brembo 405 fronts. But for the rears, if the rear brakes are the same on 2008 957 CTT with 368 fronts and 2009 957 CTTS with 380 fronts, then I will get the Stoptech cross drilled rotors with HP Plus pads. But still, I can't be sure if the 368 front and 380 front brakes both have the same rears.

 

what will be if not? you will send me 1000$? read first message, when get measure your brakes (if they are stock of course)