🚛 California CDL Air Brakes Test 2026

🚛 California CDL Air Brakes Test 2026

10 Elite Q&A | DMVTESTMASTER.COM

🧠 CA CDL AIR BRAKES — TOP EXAM QUESTIONS

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

A: To pump air into the air storage tanks.

2. Q: At what PSI do most air brake systems build pressure before the governor cuts out?

A: Around 120–140 PSI.

3. Q: What happens when air pressure drops too low in a CDL vehicle?

A: A low-air warning activates, and spring brakes may engage automatically.

4. Q: At what PSI must the low-air warning device activate?

A: Before pressure drops below 60 PSI.

5. Q: What type of brakes are used to stop the vehicle if air pressure is lost?

A: Spring brakes (also called emergency or parking brakes).

6. Q: What is “brake fade” in CDL air brake systems?

A: Loss of braking effectiveness caused by overheating from excessive use.

7. Q: Why must water and oil be drained from air tanks?

A: To prevent brake failure, freezing, and internal system damage.

8. Q: What is the correct method to test air brake leakage during the pre-trip inspection?

A: Fully charge the system, turn engine off, release brakes, and monitor PSI loss.

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

A: No more than 4 PSI per minute.

10. Q: Why should CDL drivers never rely only on service brakes on long downhill grades?

A: Because excessive braking can cause overheating and brake failure.

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