What is the maximum allowable pressure difference when checking the foot valve primary and secondary ports for leakage?

The maximum allowable pressure difference when checking the foot valve primary and secondary ports for leakage is 5 psi. This standard is established to ensure that the braking system operates effectively and safely. A pressure differential of more than 5 psi suggests a potential leak or malfunction in the foot valve, which can compromise the system's performance and safety. Maintaining this threshold is essential in troubleshooting and verifying the integrity of the brake system, as excessive leakage could lead to inadequate braking force, posing significant risks during operation.