Dodge Brake Pedal Goes to the Floor

We Have Been Trying To Fix The Brakes For A Week And They Pump Up, But When We Start The Car The Pedal Goes All The Way To The Floor....

Just Had Rear Tire Replaced. Mechanic Looked At Rear Brakes. No Issues. 2 Hr Late Rear Wheels Locked Up Can't Move Car. Dodge Caravan 136k...

I Have A 1990 Dodge Ram 4x4 With About 100,000 On It The Engine Is The 1800. Here Is My Problem. We We Purchased The Truck There Was No...