Guys when I push on the brakes I have good brakes but then the pedal will slowly start going to the floor. I thought is was the master cylinder but someone said it was probably the booster pump. I can jump on the brakes and they are solid but if I ease on the brake then it goes to the floor faster. Any help will be appreciated.

Thanks

 

Check the gasket on the master cylinder. It may be leaking out there.

 

I have been checking fluid level and it stays good.