Some of the caliper rebuild kits come with a template to orient the piston. I don't remember how it went offhand, but I know I found some pictures through a google search before.

The service manual states (or at least strongly hints) that the chamfer/cutout on the piston should be oriented on the downward-facing edge of the piston, starting 20 degrees out from vertical. Looks like there's a special Porsche tool for this (I'll bet none of us are surprised by that), but you could probably use a protractor to cut out a small template, or even just bend a paper clip, at 20 degrees if you really wanted to check the position of your pistons.

I've heard that things like this are done to promote even pad wear and reduce caliper noise, but I couldn't guess/explain how that really works.

Gary, great information on the chamfer orientation.Thanks;) As it is coming out of the service manual, I will accept it as being THE correct information.

Of course, that means I need to redo all four corners. I set the chamfer so that it was oriented parallel to the center of the wheel rather than rotated 20 degrees out at the bottom. (At least that is what I think you were saying.)

Jim

Jim - no problem. For clarity, I'm attaching the relevant description/image from the service manual in case my description didn't do it justice.

Here's the rear - there's no specific description in the manual that the rear is different than the front, but from the picture the rear appears to be more than 20 degrees out from the bottom (possibly because the chamfer might be bigger on the rear piston.)

Bump,

Taking the calipers apart, re lubing everything, replacing the rotors and bleeding the system seemed to resolve any issues I was having.

However, this last weekend the pad on one of my front brakes separated from the backing plate... Never seen that happen. The pad still has plenty left, 1/2 inch remaining. Is there any way to reattach the pad or is it done? Does Performance Friction offer any kind of warranty from manufacture defects as I'm sure this isn't suppossed to happen? Problem is, the pads sat unused for 2 years and were purchased in '08... bleh

If I cant fix them or get them warrantied I'll probably just buy Hawk DTC's never had any issues with them...

Pictures