A system and method for accessing voice services using a user equipment in a communication system is provided. The composition is a solid additive, in a viscosified fluid, in a size range small enough that it enters formation pores; it optionally bridges there to form an internal filter cake, and then decomposes to provide a breaker for the viscosifying system for the fluid. Mechanisms for extending and retracting the air deflector may include pneumatic or hydraulic systems andor electromechanical devices. Spring-supported pressure rings prevent the piston shoes from rotating relative to the support ring. The braking force controller generates a braking force in accordance with the pre-selected force.