How to Check Brake System Pressure
8:23
How to Check Brake System Pressure
Nov 4, 2024
hotrod.com
⏱️ Air Brake Test: Pressure Loss Check Explained Learn how to properly perform the air brake applied pressure test — one of the most critical parts of your CDL pre-trip inspection. In this step, you’ll test that your air system doesn’t lose more than 4 PSI in one minute while holding the service brake. Remember: patience and precision matter here — rushing this step can cause you to fail the test. Watch carefully as we demonstrate how to: ✅ Apply the service brake correctly ✅ Start your timer an
0:58
⏱️ Air Brake Test: Pressure Loss Check Explained Learn how to properly perform the air brake applied pressure test — one of the most critical parts of your CDL pre-trip inspection. In this step, you’ll test that your air system doesn’t lose more than 4 PSI in one minute while holding the service brake. Remember: patience and precision matter here — rushing this step can cause you to fail the test. Watch carefully as we demonstrate how to: ✅ Apply the service brake correctly ✅ Start your timer an
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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.
0:41
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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