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I found this blurp looking around this morning that has specifics that I haven't seen posted here in the forum. Everything else listed from this article is nothing new:

Braking

Because Ford wants RS owners to feel confident on the track, the new car is fitted with 13.78-inch ventilated front discs, up from 13.23-inch discs on the old RS. Those bigger discs are clamped on by aluminum Brembo four-piston monobloc calipers finished in a special shade of RS Blue.

The brakes are cooled by dedicated ducts in the front fascia, twin "Jet Tunnel" vents in the underbody and special airflow guides on the lower suspension arms.

As you can see, Ford has thrown everything it has at its new Focus RS – after all, the new Focus is the 30th car to carry the RS badge, a badge that has graced the flanks of legendary cars like the Escort Cosworth. We're looking forward to getting behind the wheel and finding out if the car's fancy torque-vectoring all-wheel drive works like it says on the packet.

The new Focus RS is expected to hit US showrooms in Spring 2016.

Under the skin of the new Ford Focus RS
 

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Wish they would of either stuck with 18" forged wheels or gave us bigger brakes because they look kind of funny with the 19's especially the rear brakes. I would of been happy with the GT350 brakes...

Six piston Brembo® front brake calipers and 15.5" two-piece cross drilled iron discs mounted to aluminum hats

:D
 

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I think it's one of those things you can't really appreciate until it's driven. Personally I think for the visual apeal alone they should have bumped the size up an inch or so. Wouldn't have cost them much more and with proper biasing it might help the car brake ever so slightly faster.
 

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I love the look of the blue calipers. Brembo has a longstanding history of high performance brakes so I have no doubt they'll be up to snuff. And yeah the rear brakes look a bit goofy behind the 19's but larger ones would've added more weight so it was probably worth the visual sacrifice. We'll see when we finally get behind the wheel.
 

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if you want to see a goofy-looking brakes (versus the size of the wheel)...look at the boss 302. it's ridiculous. But as mentioned above, not so much on the GT350. I've driven the GT350 on track and those brakes are incredible.
 

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I think the braking performance should be quite good. My STi has 326 mm front rotors. My 2004 Evo had 320 mm rotors.

350mm is pretty substantial as long as the weight of the RS isn't over 3400...

I do think the blue looks nice, especially on the gray that I ordered.
 

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It'll certainly be better than the st as far as brakes go. Imo the st has 250hp of go, an 150hp worth of stop. The st has pretty poor balance as a drivers car. Cant wait for my car to get here, im sure its going to be awesome
 

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It'll certainly be better than the st as far as brakes go. Imo the st has 250hp of go, an 150hp worth of stop. The st has pretty poor balance as a drivers car. Cant wait for my car to get here, im sure its going to be awesome
The FoST is by FAR better at stopping than the Mustangs I treasured: 92 GT, 93LX 5.0, 96 GT.......my wife's MCA (don't tell her I mentioned her car!). I nearly put my salesman in a neck brace when I first test drove a FoST since I was used to standing on the brake when stopping.


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I'm impressed with the size of the front to be honest. Going to be difficult to get the rears to pull their weight given their relative size, some aggressive pads on the rear might be in order at the track as I'm sure Ford went super forward with the bias for safety reasons (like most manufacturers these days).

Also great that they've used a monobloc caliper as opposed to two piece that you find on many other performance cars fitted with cheapo factory brembos. It certainly seems like Ford is telling the truth when it says these brakes will be good for 30 minutes at a time on the track. My local track is incredibly hard on brakes so I'll look forward to testing that theory.
 

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The FoST is by FAR better at stopping than the Mustangs I treasured: 92 GT, 93LX 5.0, 96 GT.......my wife's MCA (don't tell her I mentioned her car!). I nearly put my salesman in a neck brace when I first test drove a FoST since I was used to standing on the brake when stopping.


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I'm not in anyway knocking the st. I love mine. The intial bite on the first stop from 100 is pretty incredible, so is the heat build up though and soon after they just fade away. Its comforting to me that Raj made it a point to the team that the brakes needed to be worthy of the badge. We should all be grateful the he's the man with the final say. Seriously look at the cars and trucks he's putting on the road
 

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I'm impressed with the size of the front to be honest. Going to be difficult to get the rears to pull their weight given their relative size, some aggressive pads on the rear might be in order at the track as I'm sure Ford went super forward with the bias for safety reasons (like most manufacturers these days).

Also great that they've used a monobloc caliper as opposed to two piece that you find on many other performance cars fitted with cheapo factory brembos. It certainly seems like Ford is telling the truth when it says these brakes will be good for 30 minutes at a time on the track. My local track is incredibly hard on brakes so I'll look forward to testing that theory.
You do understand physics and braking correct ? Because it is unclear what you are thinking when you say "Going to be difficult to get the rears to pull their weight given their relative size". The Front brakes provide most of the braking, especially as the vehicle weights shifts to the front when you stop. 70% of the stopping power is provided by the front brakes, which is why they are 4 cylinder Brembo on the RS. See this article for some basic 101 info on braking: Automobile Brakes - A Short Course on How They Work | CarParts.com

YMMV,

MidCow3



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You do understand physics and braking correct ? Because it is unclear what you are thinking when you say "Going to be difficult to get the rears to pull their weight given their relative size". The Front brakes provide most of the braking, especially as the vehicle weights shifts to the front when you stop. 70% of the stopping power is provided by the front brakes, which is why they are 4 cylinder Brembo on the RS. See this article for some basic 101 info on braking: Automobile Brakes - A Short Course on How They Work | CarParts.com

YMMV,

MidCow3
I think he was wondering if the tiny rears are able to provide just under 50% of the clamping force of the four pots in the front
 

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I'm not in anyway knocking the st. I love mine. The intial bite on the first stop from 100 is pretty incredible, so is the heat build up though and soon after they just fade away. Its comforting to me that Raj made it a point to the team that the brakes needed to be worthy of the badge. We should all be grateful the he's the man with the final say. Seriously look at the cars and trucks he's putting on the road

Yes. This is an important distinction. The ST brakes are great...just not for extended periods. The issue isn't with the brakes. It was an issue with cooling. With the RS, Ford appears to have attacked that problem very aggressively.
 

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You do understand physics and braking correct ? Because it is unclear what you are thinking when you say "Going to be difficult to get the rears to pull their weight given their relative size". The Front brakes provide most of the braking, especially as the vehicle weights shifts to the front when you stop. 70% of the stopping power is provided by the front brakes, which is why they are 4 cylinder Brembo on the RS. See this article for some basic 101 info on braking: Automobile Brakes - A Short Course on How They Work | CarParts.com



YMMV,

MidCow3
Yes, I understand the physics of braking. Yes, I realise that the front does considerably more work than the rear, especially in this car as most of the weight is up front. But, I'm suggesting there is a bit of extra weight in the rear compared to an ST given this car's AWD system (I'd be curious to know the weight distribution). I was also suggesting that manufacturers tend to deliberately leave a bit on the table when it comes to rear braking forces as they don't want people locking the rears under either changeable conditions or when driving at the limit.

Like it or not, the rears still represent part of the overall stopping power of the car and if we're talking about out and out maximum performance alone (which I was), then they shouldn't be overlooked. I do understand however, that this is a street car first and a "track car" second.
 

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Wish they would of either stuck with 18" forged wheels or gave us bigger brakes because they look kind of funny with the 19's especially the rear brakes. I would of been happy with the GT350 brakes...

Six piston Brembo® front brake calipers and 15.5" two-piece cross drilled iron discs mounted to aluminum hats

:D
CAST to those hats. It's a very expensive 1 piece rotor at the end of the day.

The GT350 brakes are amazing though and work very well on track.

I do wonder what color these RS calipers will turn once they get a ton of heat in them.... dirty ass blue? maybe gray? maybe green?
 

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I think it's one of those things you can't really appreciate until it's driven. Personally I think for the visual apeal alone they should have bumped the size up an inch or so. Wouldn't have cost them much more and with proper biasing it might help the car brake ever so slightly faster.
I'm sure it's tire limited already, more brake pressure wouldn't change it. Ideally you want the brakes to be as small as possible while still being able to lock up whatever tires you run and able to hold (and eventually) remove heat from the system. You go larger really only for heat capacity since there are other fixes for friction.
 

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You do understand physics and braking correct ? Because it is unclear what you are thinking when you say "Going to be difficult to get the rears to pull their weight given their relative size". The Front brakes provide most of the braking, especially as the vehicle weights shifts to the front when you stop. 70% of the stopping power is provided by the front brakes, which is why they are 4 cylinder Brembo on the RS. See this article for some basic 101 info on braking: Automobile Brakes - A Short Course on How They Work | CarParts.com

YMMV,

MidCow3
Actually the number of pistons mean little in terms of brake force. If you have the same piston area a 1 or 8 pot will provide basically the same force given the same line pressure and friction level. You will destroy said pad faster and wear would be worse of course, but in terms of function.... no real difference. Fixed vs sliding is another argument but still, both have benefits IMO.
 

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Yes, I understand the physics of braking. Yes, I realise that the front does considerably more work than the rear, especially in this car as most of the weight is up front. But, I'm suggesting there is a bit of extra weight in the rear compared to an ST given this car's AWD system (I'd be curious to know the weight distribution). I was also suggesting that manufacturers tend to deliberately leave a bit on the table when it comes to rear braking forces as they don't want people locking the rears under either changeable conditions or when driving at the limit.

Like it or not, the rears still represent part of the overall stopping power of the car and if we're talking about out and out maximum performance alone (which I was), then they shouldn't be overlooked. I do understand however, that this is a street car first and a "track car" second.
Most modern cars overbrake the rear if the rear wheels are driven as they are used for traction control so they tend to generate more heat so have extra heat capacity required by the design. With all the fancy electronics maybe Ford didn't see the need to add the weight here. Are they the same as the ST? Can't recall if rear brakes specs were out yet or not.
 

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Most modern cars overbrake the rear if the rear wheels are driven as they are used for traction control so they tend to generate more heat so have extra heat capacity required by the design. With all the fancy electronics maybe Ford didn't see the need to add the weight here. Are they the same as the ST? Can't recall if rear brakes specs were out yet or not.
I'm not sure if they are the same as the ST on the rear, the pics of them just look very standard OEM with the sliding caliper so I assumed (probably wrongfully) that they were ST gear. Maybe a different sized piston in the caliper? All speculation at this point I guess! Also re: braking as part of traction/stability control, does the FoRS utilise braking to achieve stability or traction? I was under the impression it was all done with the clutch system.
 
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