Which of the following is a criterion for condemning brake equipment?

The criterion for condemning brake equipment centers on the safety and reliability of the braking system, which is critical for the overall performance of rail vehicles. Permanent bends exceeding specified tolerances are particularly significant because they can compromise the integrity and functionality of the brake components. Brakes must operate effectively under various conditions, and any permanent deformation suggests that the components may not perform as intended. This can lead to failure during operation, posing a risk to both the rail vehicle and its crew.

Additionally, while excessive rust, issues with fitting tolerances, and cracks are also important maintenance considerations, the presence of permanent bends indicates a fundamental structural failure that directly affects the equipment's operational safety, thus qualifying it as a critical reason for condemnation. Ensuring that all brake components maintain their intended shape and integrity is vital to achieving reliable stopping power and overall safety in rail operations.