How to Check Tractor & Trailer Brakes (CDL Air Brake Test Tutorial) 📘 YouTube Description: Learn the correct and simplest way to check your tractor brake, trailer brake, and service brake during your CDL Air Brake Test. 🚛💨 In this step-by-step walkthrough, we cover: ✔️ How to test the tractor brake ✔️ How to test the trailer brake ✔️ What vibration/tug you should feel ✔️ What your examiner is looking for ✔️ Common mistakes to avoid Whether you're getting ready for your CDL exam or brushing up
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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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