Most CNC routers have a three motor drive system utilizing either servo or stepper motors. Brushless DC motors are widely used as servomotors for machine tool servo drives. Typical applications include robotics, holding brakes for Z axis ball screws and servo motor brakes. Control was via an electric servo motor. The slime-possessed fur coat was achieved using four coats with parts controlled with servo motors. All six wheels had hydraulic brakes with servo assistance. DON 202 was a high friction material that did not require a brake power servo. Rear diameter ventilated discs, no vacuum servo. Lancia solved this problem by removing the brake servo. The magnetic servo tracks on the tape are factory encoded. A common type of servo provides "position control". The electrohydraulic servo valve first appeared in World War II. A fin servo system positions the fins. Bass was provided by six Servo Drive Bass Tech 7 subwoofers. The manual fast-idle was replaced with a computer operated implementation (the "STV servo").