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Question:

Fanning the brakes down further after the alarm and buzzer come on should result in the parking brake popping out for a single vehicle, and the parking brake and the trailer air supply popping out for a combination vehicle at _________.

A 40 PSI.
explanation

The parking brake for vehicles with no trailer, and the parking brake and trailer air supply valve for combination vehicles should set or pop out at 40 PSI.

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