brake size

[grvrjr]

Im planning on replacing my rotors and drums on my c1500 6.5L. When I went to rock auto they sell rotors and drums for trucks with 10 inch brakes and 11.5 inch brakes. How do I tell which size I have.

[trukdoc]

...brake code on build sheet...drums are stamped with diameter..measure across rotor...jd

[grvrjr]

thanks for the info you tha man truckdoc