At the request of some users, here is a small how to/more info about the Mazda 6 brakes.
Now I will put this here in big bold letters to avoid anyone missing it and asking again.
THERE IS NO MODIFICATION REQUIRED, TAKE YOUR OLD CALIPERS/PADS/ROTORS AND PUT IN THE NEW CALIPERS/PADS/ROTORS AND DRIVE AWAY, COMPLETE BOLT ON.
The calipers come from a 2006-2007 regular Mazda 6. You can use any other Mazda 6 caliper/pad/rotor, as long as you maintain the same year/model.
Here are some spec for different year models.
Originally Posted by MetalPGT
03-05 Mazda 6 => 11.1" => Fits no problem with a 16" wheel
06-07 Mazda 6 => 11.8" => Fits no problem with a 16" wheel
06-07 MazdaSpeed 6 => 12.2" => Must have a 17" wheel minimum
Suffice it to say, big brake kits for the Mazda 6 will also fit. Now before you go out and buy Mazda 6 calipers remember that you need the caliper, and the caliper must include mounting bracket, they sell the caliper without the bracket, so pay attention when you go buy it.
Below is what the caliper looks like installed. You can clearly see the bracket of which I speak of.
Another picture of the bracket, this time comparing it to the stock one, it is easy to see the difference between both models.
In my install I purchased rebuilt(posibly even new) calipers from a 2006-2007 Mazda 6. Part numbers are as follow:
Front Left: Cardone 18-B5000 - $107.79
Front Right: Cardone 18-B5001 - $107.79
Brake Pads: Akebono ACT1164 - $61.79
Rotors: Raybestos 680404 - $41.99 X 2
Grand total was $361.35 (plus shipping).
Now the calipers can be found in these other vehicles:
2006-2008 Ford Fusion
2007-2008 Lincoln MKZ
2006-2006 Lincoln Zephyr
2006-2008 Mercury Milan
I haven't tried it, but the rear calipers/pads/rotors should also work, but the e-brake will not work since the cable doesn't reach the caliper.
Now on to the pictures:
Old ebay rotors and stock caliper.
Stock rotor vs. Mazda 6 rotor.
Stock rotor on top of Mazda 6 rotor.(Rotor anal sex)
New brakes installed.
New front brakes.
Old rear brakes(for comparison).
Installed caliper from the side:
Installed caliper from above:
Now the caliper itself(not including the bracket) is just about the same size as our stock caliper, just a tad bigger with bigger pads. I cannot say how much bigger the pads are, since I already threw away the old ones and forgot to take pictures.
PGT97_Racer for his topic Bolt-on Big brake kit - ProbeTalk.com Forums
and MetalPGT for looking up the differences in years.