What kind of emergency release devices exist for spring-loaded brake cylinders?

Your answer is correct. In German traffic regulations, spring-loaded brake cylinders are equipped with two types of emergency release devices: pneumatic and mechanical. The pneumatic release uses air pressure to release the brake, while the mechanical release allows manual intervention to free the brake in case of air supply failure. The automatic option does not apply here, as these brakes require deliberate release mechanisms to ensure safety and prevent unintended brake release during emergencies. Understanding these helps ensure proper handling and maintenance of commercial vehicle brakes.