What type of brake is used for the parking brake system?

The parking brake system typically utilizes a design that incorporates a single disc brake combined with a spring-applied, hydraulically released brake mechanism. This configuration is particularly effective for parking or holding the load of the crane when it is not in operation.

The design allows for a reliable hold because the springs apply pressure to the brake, ensuring it remains engaged securely when the operator sets the parking brake. When needed, hydraulic pressure is used to release the brake, allowing for smooth and controlled movement of the crane. This balance of mechanical and hydraulic systems provides both safety and ease of operation, crucial for heavy machinery like cranes.

In contrast, hydraulic brakes, drum brakes, and pneumatic brake systems do have their specific applications and advantages in various mechanisms, but they do not typically fulfill the unique requirements for the parking brake system as effectively as the combination of a single disc and spring-applied design. The safety and reliability needed for crane operation depend significantly on the parking brake's ability to securely hold the machine in place, which is best achieved through the spring-applied method.