Hydraulic spring applied caliper brakes are an ideal choice for applications that require emergency stopping or static holding. This type of brake is used in industrial machinery as well as heavy off-road vehicles. However, this braking method is not a good choice for continuous slip applications, because friction pad wear results in reduction of spring force and braking torque.
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Fail-safe brakes are brakes that, by nature, are always engaged. They commonly consist of spring applied brakes which are actuated by a stack of belleville disc springs. When pressurized, by either pneumatic or hydraulic pressure, the spring stack is retracted and the brake is opened or disengaged.