If the pressure difference on the ETD and HTD is more than 3 psi, what action should be taken?

When there is a pressure difference of more than 3 psi between the Electronic Treadle Device (ETD) and the Hydraulic Treadle Device (HTD), it indicates a significant discrepancy that could affect the reliability and functionality of the air brake system. In such cases, the appropriate action is to refrain from utilizing the ETD.

Using a malfunctioning safety component can lead to inadequate braking performance, increasing the risk of accidents or incidents during train operations. Ensuring that the pressure levels are balanced and within the prescribed limits is vital for safe train handling. Taking the measure to not use the ETD when the pressure difference exceeds the threshold ensures that the braking system remains effective and dependable, thereby prioritizing safety above all.

Proper procedures must be followed to troubleshoot and rectify the condition causing the pressure discrepancy before proceeding with the installation or arming of the ETD.