The Carlisle Brake & Friction Twin QuickFill Boosted Master Cylinders utilize patented QuickFill technology to deliver up to 100% more oil volume to a vehicles brake system than can be achieved by a traditional Twin Boosted Master Cylinder. Vehicle manufacturers can leverage this additional available oil volume to provide benefits to their customers including; reduced vehicle fuel costs due to reduced wet brake parasitic brake drag; reduced pedal travel and reduced pedal efforts for improving driver comfort and an enhanced driving experience. Brake output pressures can be increased enabling secondary braking requirements to be achieved without the need for system accumulators generating free space in the engine compartment and reducing brake system system complexity and cost.