Started today. At 120 psi the Parking Brake light comes on. Dings down to 100 psi then back up to 120 and stops.
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Appears to be the Parking Brake sensor ? On the firewall. This is a 2009 W9.
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Am I heading in the right direction with this?
2009 W900L Parking Brake Sensor
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by TheLoadOut, Aug 14, 2025 at 6:37 PM.