I just saw this video were they opened the rear part and from say 30sec you can have a look at the engine and also the brake duct hoses...they seem to come from naca ducts? from the floor...
Also you see a little cooler radiator? on the left at height of one of the 2 air-ducts above the wings...
so they are (I guess) not for brake cooling but for other cooling/air? anyway interesting video>>
LOTUS 62 FUJI2010 - YouTube