Agreed, my understanding of the Code schools is to get all breaking done prior to turn in
I've seen this said countless times on internet forums, almost exclusively by people who haven't been on a California Superbike School class.
Here is a link that might elaborate on CSS's attitude to trail braking:
https://www.facebook.com/californiasuperbikeschool/posts/734032623295378
I'm guessing most people won't read it, so here are a few excepts:
Misti: Do you teach trail braking at the California Superbike School?
Keith: It's a key part of our RACE school drills. It also comes up on Level 3 during a drill called Attack Angles. It can be covered at any time during Level 4 classes for which we have specific drills. Otherwise it's also covered on request at any other point.
Misti: Some people believe that you either do it all the time in all corners or you don't do it at all. What are your thoughts on this?
Keith: It is irrelevant whether you are finishing off your braking straight up or leaned over, you always trail off the brakes. The logical approach is to train someone to do that straight up first. Later you could take up trailing them leaned over.
Misti: Is there a hard fast rule that braking should be done BEFORE you tip the bike into the turn?
Keith: There are 27 references to trailing brakes and why in my three books on riding. They were released in 1983, 1986 and 1993, way before there was any controversy on the subject. Interestingly, those books were the first time anyone had approached trail-braking in writing and photographed the advantages and uses of the technique for motorcycles. No one can argue with that, it is the first written history of trail-braking for motorcycles. These days, from how some riders talk about it you'd think that trail-braking was some new innovation, just invented. It's probably due to me describing it as "braking while leaned" or "letting of the brakes while leaning in" instead of calling it "trail braking" which had previously been an exclusively car racing term.