Air brake check isn’t optional — it’s protection. Start with air pressure in the normal range (90–120 PSI). Fan the brakes and confirm the low-air warning activates around 60 PSI. Keep fanning until the trailer protection valve (red) and tractor parking brake (yellow) automatically apply between 45–20 PSI. This verifies the system will protect the tractor, trailer, and driver if air is ever lost on the road. Professional habits save lives.
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