Bringing this up from the dead does anyone have a fitment template? I'm looking at either the vagbremtechnic or Apikol brackets. I'm hoping these will fit under a 16" wheel. On the MkV forum there were posts with pics fitting behind 16s but they were old deleted photobucket pics sadly.
I'm really not understanding the diagram on page 3. In both the MK7 and Boxter examples the smaller piston is on the leading edge. Because it is smaller and actuated with hydraulics, the smaller piston pushes out first. This angles the pads to point into the leading edge... causing squeal. Seems like you'd want the smaller piston to be on the trailing edge, thus angling the pads to create a nice funnel for the rotor to turn into.
I'm not saying the diagram is wrong - it is, in fact, correct, because I have these calipers in my garage and just checked the orientation. I just don't understand why Brembo works this way, as I've seen other 4-piston calipers work the opposite way.
From my understanding with the smaller piston being the lead in piston you get a more progressive pedal feel.
I'm planning to test fit these next week let's hope they clear 16s!
You may be able to source a fitment template from Apikol or Vagbremtechnic, I'd give them a call or send an email. I remember seeing the posts that you're referencing with the MK5 and MK6 guys with 16" wheels. Since the 312mm rotors are 12.3" across and the top of the caliper is about an inch past that, they should fit in terms of the diameter. You'll need to pay attention to the fit in terms of width though. Since the Brembo's are a bit wider that the stock calipers, you'll need to make sure that your wheels have enough of an offset to account for the extra caliper width.
Drader,
For the piston orientation, it's set up that way to give a more progressive pedal feel. You'll have a reasonably light pedal under light pressure with enough force for stopping during normal driving, and you will have plenty of force on tap for when you need it during hard braking. Also, think of it in terms of how the force is applied to the rotor as it passes through the caliper.
Under hard braking with the correct piston orientation, a particular point on the rotor will experience progressively more force as it passes through the caliper on its path of rotation. This produces good initial bite with more force after it.
Under hard braking with an incorrect piston orientation, a particular point on the rotor would experience regressively less force as it passes through the caliper on its path of rotation. This would produce great initial bite, but with less force after it.
