When should a rail mechanic perform a visual inspection of brake components?

A visual inspection of brake components should be performed before each train departure or after maintenance to ensure safety and reliability. This frequent inspection is crucial because brake systems are critical for safe train operation, allowing for quick stops and control during travel. By conducting visual checks frequently, mechanics can identify any signs of wear, damage, or malfunction in the brake components, such as cracks, leaks, or corrosion that could compromise the braking system's functionality.

Performing inspections only once a week or just during annual servicing would not provide sufficient oversight to catch potential issues that may arise in between those times. Additionally, limiting inspections to the start of night shifts does not guarantee that all essential checks have been completed before a train operates, potentially risking the safety of the train and its passengers. Thus, regular inspections before departures or post-maintenance are vital for maintaining the integrity of braking systems in rail operations.