Brake Caliper Piston Question

[Eric-986]

I'm hoping someone has a loose piston and can take a measurement for me. I rebuild my front calipers on my 09 Cayman S, and found some corrosion on a few of the pistons. I cleaned them off, but now it's bugging me, so I'm going to replace the corroded pistons. They are 36mm diameter, but I need a measurement off the piston (and of course I put the calipers back together and installed on the car).

I'm looking for the measurement from the bottom of the piston to the start of the narrowing where the dust boot fits. The piston is 30mm tall.....

Thanks for any help (worst case I pull the calipers off and apart again.....)

-Eric

99 986
09 CS