Quote:
Originally Posted by Dave-ROR
It actually doesn't work like that for piston area on a slider. You measure only one side of both calipers. If you want to measure both, you'd just double the OEM ones (so 7,240 based on your math for the WRX calipers).
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I'm not sure I agree with this part..
And again, I'm no physics expert
Here's what I think I know.. Brakes work by having the master cylinder push brake fluid through the lines into the caliper to fill in behind the pistons. That hydrolic pressure pushes the pistons outward and that in turn pushes the pads into the rotor face. The friction created by the pad pushing against the rotor allows you to slow down.
Knowing this.. I don't think you should "double" the calculation for the OEM sliding calipers. They only fill with fluid on one side. The hydro pressure from the master cylinder is only filling in behind two pistons. That force is distributed to the other side as well.. but it's not double force.. it's the same amount of hydrolic fluid.
If anything, I'm worried they have too much front bias.
I'm planning to do the 2 pistons rears as well.. just need to come up with the extra $400 to finish it off. Doing so should help even out the brake bias (whether the Z calipers have more or less force.. it should help equal it out going to fixed on all 4 corners).
Any thoughts?