The Electro-Thrust Shoe Brakes have been in service for over 10 years. AISE sizes range from 8 inches in diameter up to 30 inch diameter wheels. Torque values range from 100 foot-pounds to 9,000 ft./lbs.! We also manufacture a line of non-AISE rated brakes. The brakes are spring set for fail-safe operation with an electro-hydraulic actuator that overcomes a setting spring and releases the brake.