What action should be taken if one of the car's brakes is inoperative during a pickup?

Answer: A — Leave the car, place bad order tags on both sides, and notify the dispatcher.

The appropriate action when one of the car's brakes is inoperative during a pickup is to leave the car, place bad order tags on both sides, and notify the dispatcher. This procedure ensures that safety protocols are followed. By tagging the car to indicate its condition, the next crew or personnel who encounter the car will be aware of the brake issue and can take necessary precautions. Notifying the dispatcher is crucial for record-keeping and operational planning, as it allows the railroad to manage resources effectively and ensure that the defective car is addressed appropriately. Taking the car if operable train brakes are above 85 percent and reporting it to the dispatcher while proceeding to the next terminal are not suitable actions when a brake is inoperative. Attempting to repair the car's brakes before proceeding could delay operations and may not be feasible depending on time constraints and safety regulations. Therefore, leaving the car and immediately reporting its condition is the best course of action to maintain safety and compliance with railroad operations.