[Elizabeth]

At the dealer I saw a ST1 with red painted calipers. And an ST3 without.
What decides the red brake calipers?
PS both cars were painted blue.

 

[xtraspin]

It's part of the Rado Grey wheel appearance package.

From the focus brochure:

 

[Elizabeth]

Thanks.

Added:
After thinking about the Rado wheels, and looking at pics of a Tangerine Scream St with them and the red calipers, I changed my week old ST order to include them.
(the dealer said not a problem)
The wheels seem more sophisticated in that hue, and the red calipers are just plain fun.