Spring and Air Engaged Friction Brakes
Pneumatic friction brakes from Mach III provide simple solutions for stopping and holding.
Spring engaged brakes remain engaged in the absence of air pressure. They are often referred to as power-off brakes, fail-safe brakes or holding brakes. These brakes are best suited for applications where they are used to prevent rotary motion of a load and are not suitable for dynamic stopping.
Air engaged brakes are applied with compressed air and release in the absence of air pressure. They are often referred to as power-on brakes. These brakes are best suited for bringing a load to a stop and preventing rotary motion of a load.

Spring Engaged Brakes
Function: Holding, Failsafe (Non-Cycling Applications)
Drive Arrangement: Machine Frame or Bracket to Shaft
Spring pressure compresses drive and friction discs to produce a fixed amount of torque.
Air pressure is applied to disengage the brake.
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Spring Engaged Brakes – NEMA Frame
Function: Holding, Failsafe (Non-Cycling Applications)
Drive Arrangement: Motor to Gear Reducer (Gear Box)
Spring pressure compresses drive and friction discs to produce a fixed amount of torque.
Air pressure is applied to disengage the brake.