What is the purpose of the parking brake in a 12N Crawler Tractor?

The parking brake on a 12N Crawler Tractor is specifically designed to secure the tractor when it is parked, particularly on inclines or uneven terrain. This is essential for safety, as it prevents the tractor from rolling or moving unexpectedly when it is not in operation. When the parking brake is engaged, it locks the tractor's wheels in place, ensuring that it remains stationary even if the ground is sloped. This helps protect both the tractor and the operator from potential accidents that could occur due to unwanted movement.

While the other options may relate to different aspects of tractor operation, they do not pertain directly to the primary function of the parking brake. Therefore, understanding the role of the parking brake is crucial for safe operation and maintenance of the tractor when it is not in use.