Flip top leaking bad

Is there any brake fluid above the rubber seal, between it and the metal cap ?
I really dont think you could slosh all the fluid out of the resivoir. My best guess would be a leak under the car letting the rear brakes drain. If the front rotors turn blue they are running far too hot. Front doing all the braking, lines hooked up backward, wrong pad material or crystalized pads are common causes.