1999 International 9200 - 12.7 Detroit. I will have intermittent air pressure drop when applying brakes at red light. It will drop sometimes so much that the buzzer will go off. I apply the parking brake and pressure will rise and hold pressure. Other times at red light, pressure will stay up 110-120. Very intermittent. Murphy's law kicks in when trying to check under truck while someone is in cab holding brake peddle. Always holds pressure. Murphy is a bad mo fo sometimes. Any ideas of what to check ?
Intermittent air pressure drop at red light.
Discussion in 'Trucks [ Eighteen Wheelers ]' started by jeffman164, Oct 10, 2025 at 7:45 PM.
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