It's just an accent color a place to add a splash of color other than black or chrome. I also like them when they're bright yellow. I think the red pinstripe with red calipers just adds a little bit of pizzazz. I'm thinking of doing the stripes in the calipers also
Great job. I have a 07 ultra with midnight pearl and red pinstripes. I think the red calipers would look good. Good weekend project when weather is bad. Thanks for the pictures.