Like I said, I still have my V6 brakes with the fluid change and still brakes fine. It's your experience that determines when you should brake around certain areas on the track. I very rarely use my brakes for most corners and usually just coast and modulate the throttle. The biggest usage is after a long straight to slow down for the next corner. never in a turn. sometimes this can cause the front end to push. If you have to brake in a corner then you probably are braking too late.
See my vid:
From Texas world Speedway.