I wanted to see how firm the brake pedal would get when the car was off to judge whether the fluid needed changing. So I pumped the pedal until it got as hard as it got. Though past that point, I was still pressing pretty hard trying to feel for squish. I think I was pressing on it hard enough that I damaged something. Now, when I turn on the car, there's a large deadzone before the brakes start to bite. On the master cylinder side of the brake booster, it's of course used to this kind of pressure, but I don't think the pedal side of the brake booster is built to withstand someone cranking on it like this. Is there something I could have warped or stretched in the brake booster that would cause this long pedal travel?