RCO Training – Mechanical Practice Test

Penalty Brake Application context: Which statement is accurate about Suppression?

Suppression is used to reset the brake system following a Penalty Brake Application. Suppression vents the brake pipe to approximately 10 psi after a penalty application. Suppression automatically applies emergency brakes. Suppression increases the service reduction beyond full service.

Correct Answer:

Suppression is used to reset the brake system following a Penalty Brake Application.

Explanation:

Suppression is a reset mechanism for the braking system after a Penalty Brake Application. When a penalty brake event occurs, the system enters a protected state to prevent unsafe operation. Suppression clears that state and reinitializes the controls so normal service braking can resume once the underlying issue is resolved. It isn’t about venting the brake pipe to a fixed low pressure, it doesn’t automatically trigger emergency brakes, and it doesn’t push the service reduction beyond full service—the purpose is simply to restore normal operation by clearing the penalty condition.

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