Union Pacific Air Brakes Practice Test

To minimize sticking brakes on a car, making a full service brake application before opening angle cocks is essential. This action helps to ensure that the brake system is properly filled with air and that the brake components are functioning correctly prior to making any adjustments or connections. When brakes are applied fully, it can help to disengage any potential sticking or frozen components that may have been impeded by moisture or dirt. By applying the brakes, any debris or obstructions in the brake pads or drums may be pressed out, thereby promoting smoother operation. This thorough application is particularly important before releasing pressure in the system, as doing so without first ensuring that the brakes are in their optimal state can lead to complications or failures in brake performance. While visual inspections and lubrication can also be part of maintenance, they do not specifically address the immediate concern of sticking brakes in the same proactive manner as making a full service application. Ensuring no air brakes are applied is counterproductive and would likely exacerbate the sticking issue.