Repeated actuation of the rotary solenoid advances the snap-switch forward one position. Brake system actuation mechanisms are either mechanical or hydraulic. The desmodromic valve actuation method was retained. The piezoresistive sensing bridge is laid between two heating actuation resistors. It also allows the use of higher air pressures for valve actuation. Hydraulic actuation was used for controlling the flaps. It also heralded an hydraulic front brake actuation. The preferred method of pitch change actuation is hydraulic with constant speed units (CSU). The engine then briefly operates with a fuel-rich mixture after each valve actuation. Brushless motors are used in industrial positioning and actuation applications. In manufacturing, brushless motors are primarily used for motion control, positioning or actuation systems. This could be accomplished through the use of fluidic actuation. Mechanical systems contain moving parts, which are usually actuation and microvalve membranes or flaps. There were more accurate wheel sensors for improved ABS actuation. Artificial muscles can be divided into three major groups based on their actuation mechanism.