[sleeper17]

So im looking at getting new rotors and pads and it seems tire rack has the best deal from what i have searched. anyways im not a novice when it comes to brakes but they are asking me what mm discs i have. i dont even know how to find that out?
this is from the website --
STOP TECH SPORT SLOTTED CRYO-TREATED ROTOR
Note: (Front Left) Slotted vented rotor. For models with 320mm Front discs.
Note: (Front Left) Slotted vented rotor. For models with 335mm Front discs.

sooo....... what happens if i get the wrong mm?

 

[Kevin]

Pre 2014.5 use a 12.6" rotor, post use a 13.1" rotor.

 

[sleeper17]

im pretty sure i am pre 2014 but could i use the 13.1 without any hassle?

 

[danmad32]

im pretty sure i am pre 2014 but could i use the 13.1 without any hassle?

You can and it's a good cheap upgrade, but also need caliper brackets and new or modified dust shields. Info below. I've had good luck with Centric/Stoptech rotors from AutoAnything (they often have sales on them), also OEM from Ford are pretty cheap too.

http://www.focusst.org/forum/focus-st-brakes/36021-12-6-13-1-upgrade.html

Edit: One thing to note though is that if you have the 16" spare tire, it won't fit on the front anymore.

 

[Kevin]

Then once you've done the front you might as well do the back.

http://www.focusst.org/forum/focus-...t-frankenbrake-larger-rear-brakes-budget.html