560SEC - Brake Pedal goes to floor - next to no braking ability

After winter storage this year, I took my SEC out to go for a drive and noticed I have to push the brake pedal all the way to the floor to get any braking to happen The fluid is all still in the reservoir and not leaking How do I troubleshoot what could be wrong?

After winter storage this year, I took my SEC out to go for a drive and noticed I have to push the brake pedal all the way to the floor to get any braking to happen
The fluid is all still in the reservoir and not leaking
How do I troubleshoot what could be wrong?

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