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Anyone installed some larger sized rear discs? The front factorys are larger than the rear. A noticable difference to me. Has anyone found a kit or other solution?
Bigger Rear Disc Brakes
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533 Posts
They're really not necessary as it's not a RWD it's a FWD hence the bigger discs in the front... It may be somewhat of an eyesore to some but I think it looks ok... You have the freedom to change whatever you wish though as its your ride so enjoy!!
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yes sir just putting in my 2 cents!
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Solution to what? the brakes work fine as they are.
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I didn't mean solution as in, they are a problem. I meant solution to what I was trying to achieve. They work fine, yes. I just want both the front a rear to be the same size.
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533 Posts
As the hyundai/kia parts have a lot of application between vehicles, you could try and see if the tiburon big brake kit may work? Even sized discs and calipers all the way around. Just a thought not sure if it wil work or not?
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I agree, this is probably your best bet at this time. I don't know of any aftermarket companies coming up with anything yet.
Nadeem
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I did notice if you look at the thread with the white koup's you see the one has some nice Brembo's on it.. Wonder if they have an application for our cars yet?
Given enough time and money, anything is possible. Simply buy two new front rotors, weld up a caliper mount, and pray like hell it fits... or chop/cut/weld until it does. Lose the park brake, but who needs those, anyways? 
The point here is the time and money. Do you have lots of either to invest on something that is considered completely cosmetic? Maybe you could go about it the other way; purchase the front rotors, spindles and calipers from a base/EX (possibly axles, bearings... a whole ton of stuff)... then the difference would only be 3/4" instead of an inch and a half. But your braking performance may be affected - there is a perfectly good reason a whole bunch of engineers gave the car bigger front brakes... I personally wouldn't mess with it.
The point here is the time and money. Do you have lots of either to invest on something that is considered completely cosmetic? Maybe you could go about it the other way; purchase the front rotors, spindles and calipers from a base/EX (possibly axles, bearings... a whole ton of stuff)... then the difference would only be 3/4" instead of an inch and a half. But your braking performance may be affected - there is a perfectly good reason a whole bunch of engineers gave the car bigger front brakes... I personally wouldn't mess with it.
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533 Posts
^^^Agreed
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126 Posts
The rear bakes have to be smaller 'cause they do less work than the front. If they were the same size the rear would lock up/trigger ABS prematurely in relation to the front and you'd get less overall braking effectiveness than with the OEM brakes. Not exactly a performance enhancement...
You want bigger rear discs, you'll need yet bigger front discs...
******
You want bigger rear discs, you'll need yet bigger front discs...
******
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142 Posts
Exactly ! I've never seen a car with same size front/rear brakes .
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243 Posts
Uhh, front discs are ALWAYS larger than the rear, even on a Ferrari. You're gonna screw up your car if you go larger on the rear.
Come on, people! A little basic car sense seems to missing in some of these posts.
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64 Posts
OK, first of all, no manufacturer makes a car with equal size discs all the way around the car. The front brakes are always larger because they take the most of the inertia of forward momentum when stopping. It has nothing to do with whether it's front, rear, or 4 wheel drive. Also, most manufacturers don't make vented rear discs for brakes, as again, the front brakes are taking most of the inertia and also get hotter, so thus they are vented to cool more quickly. I'm just glad the Koup has 4 wheel Antilock Disc's, instead of Front Disc/Rear Drum Brakes. From all of the road tests I've read, and seen videos of, Everyone seems to be impressed with the Koup's stopping distance (Like 120' 60-0), Fade, and braking feel, so I'd leave mine alone, but that's just me. Besides I don't want it to affect my warranty.
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Does it make a big difference if I put bigger brakes?
Increasing the diameter of your brake rotor (be it on the front, rear, or both) may improve braking distances, but likely not on most recent vehicles. 99% of street driven cars have absolutely NO need of a brake improvement over stock, except possibly a change of pads. Generally bigger brakes mean more surface area, which can increase 'grab' and improved cooling to resist fade or squish, but with ABS now kicking in and doing most of the work that difference is subjective.
The rule is this: As long as you can lock up your brakes (or activate ABS), improving brakes will not serve any purpose to improve brake distance.
Things that really can improve braking? Better tires, first off. ABS will allow you to maximize your braking by not allowing lock up. But lock up is not the point where the brakes grab too hard, it's the point where the tire's friction with the road is overcome by the pad's friction on the rotor. So by increasing your available traction on the road, you'll increase the amount of force your ABS system will allow before it needs to step in. The next option to improve braking is a better brake pad. Higher 'bite', lower dusting, more fade resistance - all factors that can help but only in a 'track' or race type scenario. Most people's cars will simply never brake hard enough to require these kinds of changes.
As for changing things and messing up the ABS (and by association the ESC), not true. It simply looks at axle speed at all four corners, steering input, speed, etc and tried to guess the driver's intentions, and helps them get there. As long as you don't change diameter of one tire, or have your alignment seriously askew, the system will adapt and keep things going your way. As long as axle speed is relative to the inputs it has, it doesn't care what size brake rotor or how much money you spent on Yellowstuffs, it only knows that once it hits 0rpm on one wheel, it's going to reduce brake pressure to that wheel, until it sees rpm increase to spec, and then repeat.
Oh, and there ARE vehicles out there with larger rear brakes than the fronts; I refer anyone interested to the spec sheet for the 2011 Sorento. Rear rotors are exactly 1 tenth of an inch larger than the fronts.
The rule is this: As long as you can lock up your brakes (or activate ABS), improving brakes will not serve any purpose to improve brake distance.
Things that really can improve braking? Better tires, first off. ABS will allow you to maximize your braking by not allowing lock up. But lock up is not the point where the brakes grab too hard, it's the point where the tire's friction with the road is overcome by the pad's friction on the rotor. So by increasing your available traction on the road, you'll increase the amount of force your ABS system will allow before it needs to step in. The next option to improve braking is a better brake pad. Higher 'bite', lower dusting, more fade resistance - all factors that can help but only in a 'track' or race type scenario. Most people's cars will simply never brake hard enough to require these kinds of changes.
As for changing things and messing up the ABS (and by association the ESC), not true. It simply looks at axle speed at all four corners, steering input, speed, etc and tried to guess the driver's intentions, and helps them get there. As long as you don't change diameter of one tire, or have your alignment seriously askew, the system will adapt and keep things going your way. As long as axle speed is relative to the inputs it has, it doesn't care what size brake rotor or how much money you spent on Yellowstuffs, it only knows that once it hits 0rpm on one wheel, it's going to reduce brake pressure to that wheel, until it sees rpm increase to spec, and then repeat.
Oh, and there ARE vehicles out there with larger rear brakes than the fronts; I refer anyone interested to the spec sheet for the 2011 Sorento. Rear rotors are exactly 1 tenth of an inch larger than the fronts.
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