A braking device is provided for an in-line skate where the braking device selectively alters the motion of the in-line skate depending upon the angulation of the in-line skate relative to a surface. This device is suitable for establishing a maximum degree of opening in the valve, a maximum degree of closure, or both; this operation is carried out manually without said limitation preventing the valve from being managed by means of an actuator. The airfuel ratio control module controls an airfuel ratio of an engine based on the first amount, the second amount, and a temperature of a substrate disposed in the second SCR catalyst. An actuator moves the fluid delivery members from a retracted position within the elongated members to a first deployed position extending radially with respect to the elongated member and moves the fluid delivery members from the first deployed position to a second deployed position extending further radially from the elongated member.