[bdonally]

Christien:
I assume you were at the DE event last weekend on the Mosport main track.
From your description, I think you were overheating the pads.
As mentioned in another reply, it is likely that you are over-using the brakes, and as you start carrying more speed through the corners you will have a bit less problem.
I have found that Mosport is not as hard on brakes as Shannonville.
Always pay attention to fluid, as mentioned, but I think that if you use either a track pad (Hawk blue, for instance) or a high performance pad (like Hawk HP+) I think you will find you are fine until you get out of the green run group.
I know Mantis can supply Hawk; they probably have other recommendations.
Don't use the Hawk Blues on the street - when they are cold they are an effective cutting tool and will go thorough rotors very quickly, as well as being very noisy.
You are going to blow through the $400 barrier pretty quickly, though.