I recently bought a new car and it came it with disc brakes (specifically the Brembo's that come with the new BRZ). If the conditions are rainy or snowy out, I've noticed there's a significant amount of time (up to 2 seconds) from when I press the brake pedal to when the car actually starts slowing down. There's essentially no deceleration unless I slam the pedal down or give it a few seconds. This only seems to happen after a period of not braking (say I'm on the highway for 15 minutes). I've never had this happen on my previous vehicles (but they all had drum brakes) and the brakes work as expected in dry conditions.
Is it normal for disc brakes to lose functionality like this in wet conditions?