CDL Pre-Trip: How to Check Parking, Trailer & Service Brakes 📜 YouTube Description: In this video, we walk through the final steps of your in-cab air brake inspection. After verifying your air pressure is back between 120–140 PSI, it’s time to test your parking brake system: ✅ Trailer brake (red knob) ✅ Tractor brake (yellow knob) ✅ Service brake engagement You’ll learn how to safely place the truck in drive, release individual brakes, apply light throttle, and confirm the vehicle does not move
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