Dash Brake light on? Rear disc conversion, w/ new booster

The car is a 91 GT with the Turbo Coupe rear disc conversion. Everything was working fine till I decided to upgrade the brake booster to the 93 Cobra for better pedal feel. Pedal feels much better now, imho, but now I've had my dash brake light come on twice.

First time the light came on I pulled over and noticed that it was low on brake fluid. No biggie, guess the guys didn't top it off. I filled i back up, and now a week later I'm getting the light again. I checked the level and it 'seems' a little low, but I can't find evidence of leaking brake fluid anywhere. This happened yesterday in hot weather/traffic. Today on they way into work there was NO light.

Any ideas? It was a new booster so I don't think I'm leaking into it. And why would this come up only in hot temp? I'm using Castrol LMA fluid, which is supposed to have a higher temp rating.

confused.
 
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