TOYOTA CAMRY BRAKE PEDAL SPONGY

I Have The Car Listed Above Le. I Replaced The Front Calipers Then Bled The Brakes (rear Right, Rear Left, Front Right, Front Left)....

When I Got This Car 6 Months Ago The Brakes Worked Fine. About A Month Ago, The Brake Pedal Became Soft And You Had To Push Farther To Get...

This Problem Started About Two Years Ago. Each Time I Complained To My Mechanic, He Will Scan The Car And Said Nothing Is Wrong But He Will...