Lines are good. I know one rear caliper boot is on its way out. Keeping my eye out for a replacment. But it dosent leak and still holds the rotor good when someones pressing the pedal. As do the rest. Fluid dosent change. I bled the new MC as instructed. But it was doing the exact same thing before I replaced the MC

I always thought that if the booster was bad, it would have the opposite effect and not help the pedal hit the floor.