Fast fill tandem master cylinder

A fast fill braking system includes a master cylinder (100), a primary pressure chamber (124) having a first chamber portion located forwardly of a second chamber portion, the first chamber portion (128) having a diameter larger than a diameter of the second chamber portion (130), and a primary piston (107) including a first piston portion (256) positioned within the primary pressure chamber (124) and a second piston portion (270) extending out of the primary pressure chamber, the first piston portion having a diameter (i) larger than a diameter of the second piston portion (270), and (ii) complementary to the diameter of the second chamber portion (130).