Quote:
Originally Posted by JusticePete
You are correct.
The leading edge is in reference to the rotation of the rotor to the caliper when driving forward. We'll call the smaller Piston #1. When the Caliper is mounted on the front side of the rotor Piston #1 is on top and the cross-over tube on the bottom. To keep the leading edge orientation the same when mounted on the backside of the leading edge Piston #1 is on the bottom. That is why the cross-over tube is moved.
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Here is a photo of a drivers side rear CTS-V on the left. As you state, the smaller Piston #1 is on the top of the caliper and the cross-over tube is on the bottom of the caliper. As the rotor goes around forward, it hits Piston #1 first.
You take that same drivers side rear CTS-V caliper and rotate is 180 degrees to mount it on the rear of the axle, the picture on the right, Piston #1 now moves to the bottom of the caliper and the cross-over tube to the top. Rotor rotation remains the same, so as the rotor rotates forward, it still hits Piston #1 first.
This looks like it keeps the leading edge orientation as you stated above. What am I missing here?