OK, on Grandprixhistory link I posted, first photo after the one of Zuccarelli at the drawing board, 4 cars lined up, if those aren't front brakes then they carried pie plates around
Next photo #5 front brakes?
Small photos at the bottom, car #5 one with OS on a signboard, maybe at Coupe de La Sarthe (which we now know as Circuit Le Mans) front brakes?
Next one, possibly same corner but exit, car 19 brakes?
Last photo, side on, brakes?
I guess they could be later photos than the site says, but they tally with the entry list.
There is so much conflicting information on this topic though it's very hard to make any definitive statement I believe, without any chance of being disagreed with.
According to "Blue Blood" by Serge Bellu Peugeot used front brakes in 1914 and those cars went to the US.