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Discussion Starter · #1 ·
So looking into it there does not seem to be a way to get bigger brakes in the rear. also after further research since it looks like the 3/6/CX-5 all share the same front brakes in some form or other... i was wondering maybe we can use the OEM rear brakes from the CX-5 on the Mazda3. since i believe all of mazdas cars use the EPB now, could just be plug and play. Has anyone looked into this before, or have a way to find out? My car was just ordered so i cant test it yet LOL, Im just not sure where i can get a brand new assembled CX-5 rear brake system.

would be a big upgrade for the rear.
(taken straight from MazdaUSA specs sheet.)

Mazda 3 rear brake size 10.43"
CX-5 Rear brake size 11.9" (prob bigger caliper too?)


Pair these with one of the existing Front BBKs out there usually over 12", and youll have lots of brakes all around.
 

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Discussion Starter · #2 ·
and if they do work.. maybe we can get them anodized or powerd coated to match a front BBK color.
 

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Are you sure you aren't just adding weight where it's not necessary? These cars are relatively low on power and weight; adding rotating unsprung mass should be the last thing you want to do. Unless you're tracking or driving your car to the max for lengths of time, adding heavier brake rotors is only going to reduce performance and mpg.

All that being said, i would love to source some two piece rotors, perhaps made for an older Evo or similar, that we can retrofit to our cars. 2 piece rotors are often half the weight of standard rotors, so combined with better brake pads, now you're achieving less rotating mass, and better braking performance.

To each their own. I've driven my S GT quite hard in the mountains playing cat and mouse with much faster cars, and the brakes were never an issue. For some, apparently they are.
 

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Mazda had a Brembo brake kit installed on their SEMA auto car for both the front and rear, so it is doable.
Everything is doable, but depends on the price and parts availability ;) This Brembo kit is probably only for the show, I haven't seen such option from Mazda.
 

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2 piece rotors are often half the weight of standard rotors, so combined with better brake pads, now you're achieving less rotating mass, and better braking performance.
Well, in reality you are not saving 50% of the rotor weight with 2 piece design. You are saving weight only from the hat area. On 1 piece design the hat is made from cast iron together with the rotor. On the 2 piece rotor the hat is usually made from aluminum and bolted to the cast rotor.

Speaking of Evo X for example, as I'm such owner, same rotor manufacturer:
- 1 piece front rotor 11.8 kg.
- 2 piece front rotor 9.5 kg and that's only the rotor w/o the hat.

So in reality for 350 mm rotor you could save around 2 kg on rotor mass, around 20%.

Not a big saving, considering double the price of 2 piece rotors compared to 1 piece design.
 

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Are you sure you aren't just adding weight where it's not necessary? These cars are relatively low on power and weight; adding rotating unsprung mass should be the last thing you want to do. Unless you're tracking or driving your car to the max for lengths of time, adding heavier brake rotors is only going to reduce performance and mpg.
^
This


For a daily driver having installed a BBK is way over kill IMO, why do you need all that "stopping" power if the car can't go that fast in the first place?.:frown2:

I have DBA T2 Front Slotted Rotors and upgraded brake pads and IMO this setup is already a bit too exaggerated for what the car can do.

People also tend to forget that what really helps a car to stop are the tires, better tires can give you better stopping performance and grip.

So, If braking is what you are trying to improve on your car, then start with better tires and better brake pads.

You can also read this thread where one of our members has embraced this journey you are inquiring about:

http://mazda3revolution.com/forums/...andling/215810-project-bbk-big-brake-kit.html
 

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2 piece rotors are often half the weight of standard rotors, so combined with better brake pads, now you're achieving less rotating mass, and better braking performance.
Well, in reality you are not saving 50% of the rotor weight with 2 piece design. You are saving weight only from the hat area. On 1 piece design the hat is made from cast iron together with the rotor. On the 2 piece rotor the hat is usually made from aluminum and bolted to the cast rotor.
You're right, I went back and looked at the ones I purchased years ago for my Audi; it was a 25% weight savings, not 50% like I previously mentioned.

I still maintain that reducing rotating mass (brake rotors, wheels, and tires) will be drastically more beneficial to these low-power low-weight cars than increasing brake size.
 

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Discussion Starter · #9 ·
SEMA car is a show car.

What I'm trying to get at here is to explore possible options for mods that are just plug and play here. If we can explore this it would help out the community whether it be for performance, or for aesthetics, for this moment in time or 10 years from now.

I have been playing with cars for a very very long time, i know the affects of what altering diffrent components do.
 

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SEMA car is a show car.

What I'm trying to get at here is to explore possible options for mods that are just plug and play here. If we can explore this it would help out the community whether it be for performance, or for aesthetics, for this moment in time or 10 years from now.

I have been playing with cars for a very very long time, i know the affects of what altering diffrent components do.
Cool. Understood. I was just blind-sided by you not even having the car yet, and you're inquiring about bigger rear brakes. Just seemed like a really odd priority.

I also have been playing with cars for a long time, and I can appreciate a large mod knowledge base. I came from the euro world, which has a monster following and aftermarket. To say I'm disappointed in the Mazda scene is an understatement, for sure. So, sorry for clogging your thread, and good luck! The more info, the better!
 

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Discussion Starter · #11 · (Edited)
Cool. Understood. I was just blind-sided by you not even having the car yet, and you're inquiring about bigger rear brakes. Just seemed like a really odd priority.

I also have been playing with cars for a long time, and I can appreciate a large mod knowledge base. I came from the euro world, which has a monster following and aftermarket. To say I'm disappointed in the Mazda scene is an understatement, for sure. So, sorry for clogging your thread, and good luck! The more info, the better!
HA! no problem. maybe should have added more to the first post about my intentions lol. i just found a gap in information and would like to explore the area...

also the Mazda scene is not disappointing.. its the eco-box car scene that's disappointing lol.. look at any RX-# , MX-5, or mazdaspeed forum and its a gold mine of info. and plenty of aftermarket support.

EDIT: Oh and believe me i dont have any plans to mod this car right away... i would like to enjoy it as is first, and also enjoy the peace and quiet for once. driving loud and rough cars everyday for years gets to you.
 

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It is also worth noting that the Brembo front brake kit that fits the Mazda 3 and 6 is $3,100...give or take.

It looks sick, but it's just too damn expensive and not really all that beneficial on our cars.
CK
 

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Discussion Starter · #14 ·
understood that there are plenty of options for the front. but this thread is intended to explore rear options that incorporate the electronic parking brake. Which means using the rears from the 6 or the cx-5 or maybe even the cx-9.... of course anyone can slap on a aftermarket brake kit, but you'll lose the parking brake.
 

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The cx5 brakes are a direct swap in. Literally, just get the pads, rotor, calipers, unbolt your existing ones, bolt on cx5 version, bleed lines, and good to go.
 

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Anyone willing to see if the Brembo BBK that was included with the higher end 2010 to 2016 Hyundai Genesis models will fit our cars?
CK


ebay 1
ebay 2
 

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Discussion Starter · #17 · (Edited)
The cx5 brakes are a direct swap in. Literally, just get the pads, rotor, calipers, unbolt your existing ones, bolt on cx5 version, bleed lines, and good to go.
have you tried it? or seen a thread with the swap?

EDIT: im going to assume the plug for the EPB is the same then.
 

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Anyone willing to see if the Brembo BBK that was included with the higher end 2010 to 2016 Hyundai Genesis models will fit our cars?
CK


ebay 1
ebay 2
I did a little more digging and unfortunately, these will not fit our cars.

The BBK that fits the Hyundai Genesis Coupe and Sedan have a 6 piston monobloc in front and a 4 piston monobloc in back and they need a 365/380mm x 34mm rotor in front and a 380mm x 28mm rotor in back. The BBK that fits the fronts of the Mazda 6 is a 4 piston monobloc that needs a 365mm x 29mm rotor.
CK
 

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Actually the caliper mounting is the most important. Rotor size depends on how you mount the caliper.
 
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