Caliper removal help

I'm gonna refresh my caliper paint and am removing the rears. I've got the main caliper removed and I'm gonna remove the piece that holds the brake pads but;
What size is the big torx bolt on the back to remove the other half of the caliper?
Also, I figured the nuts were metric on the other half but they're 1/2". Everything on my 69 Porsche is metric.
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It's not a Torx, it's a M14 triple square you need for those carrier bolts

Thanks for that. That is how that caliper piece is removed? Would I need to rebuild piston if I have them powder coated instead of paint?

DuncanHP said:

Thanks for that. That is how that caliper piece is removed? Would I need to rebuild piston if I have them powder coated instead of paint?

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Maybe these will help.
https://www.youtube.com/watch?v=yPcyJb-b47c - Mk5 Front

https://www.youtube.com/watch?v=wt8v4lVZGL0 - Mk5 Rear

This is the best caliper paint system.
http://www.g2usa.com/
Prep is everything. Squeaky clean is the rule. There must be a good reason not to powder coat brake calipers because you really don't hear of it. Wheels yes. Calipers get painted.