🚛 Texas CDL Air Brakes Test 2026

🚛 Texas CDL Air Brakes Test 2026

10 Elite Q&A | DMVTESTMASTER.COM

🧠 TEXAS CDL AIR BRAKES — EXAM-LEVEL QUESTIONS

1. Q: What is the function of the air compressor in a CDL air brake system?

A: To pump air into the air storage tanks for braking.

2. Q: At what air pressure does the governor usually cut out in a Texas CDL vehicle?

A: Between 120 and 140 PSI.

3. Q: What must happen before air pressure drops below 60 PSI?

A: A low-air warning device must activate.

4. Q: What type of brakes automatically engage if air pressure is lost?

A: Spring brakes (emergency/parking brakes).

5. Q: What is the danger of pumping the brakes repeatedly on a long downgrade?

A: Brake fade caused by overheating.

6. Q: Why must air tanks be drained daily?

A: To remove moisture and oil that can cause brake failure or freezing.

7. Q: How do you properly test air brake leakage during a pre-trip inspection?

A: With the system fully charged, engine off, brakes released, and PSI monitored for loss.

8. Q: What is the maximum allowable air pressure loss for a combination vehicle with brakes released?

A: No more than 4 PSI per minute.

9. Q: What device protects the air brake system from too much pressure?

A: The air governor.

10. Q: Why should CDL drivers in Texas downshift before descending steep grades?

A: To reduce reliance on service brakes and prevent brake overheating or failure.

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