rep1969 10 Report post Posted April 12, 2014 I have a 1970 Mustang with 4 wheel drum brakes. I have been looking at a complete 4 wheel disc brake kit from Wilwood. They are 12.19 rotors on all 4 corners. Do I need to be thinking of 13" instead? Will the 12" units work for what I want? It will only be for spirited road use and no track use at this point anyway. Thanks guys. Quote Share this post Link to post Share on other sites
Max Power 74 Report post Posted April 12, 2014 You might have problems with the 13" and your wheels. Quote Share this post Link to post Share on other sites
Trinitys 134 Report post Posted April 12, 2014 For spirited road use...you'd be fine with front disc and rear drums so pretty much any disc rear is an upgrade from there. Quote Share this post Link to post Share on other sites
