This brake master cylinder is a composite design (plastic reservoir and aluminum body). The brake master cylinder incorporates a conventional diagonal brake system split. The brake master cylinder reservoir on this vehicle is a one-piece plastic design. The brake master cylinder reservoir can be serviced separately from the brake master cylinder. The brake master cylinder primary piston provides the fluid pressure to the front disc brakes. The master cylinder secondary piston provides the fluid pressure to the rear brake system. The remaining system continues to function if pressure is lost from either system.