Georgia Air Brakes Knowledge Test CDL Practice Test
Practice with real GA Air Brakes exam questions and detailed explanations. Rated 4.8 stars by 1,000+ drivers.
Written by CDL holders and exam prep experts · Updated April 2026
Free Questions
10
Passing Score
80%
Time Limit
No time limit specified
Prerequisites
General Knowledge test must be completed first
What is the Air Brakes Knowledge Test Test?
The Air Brakes knowledge test is required for commercial vehicles equipped with air brake systems. Passing this test demonstrates your knowledge of air brake operation, inspection procedures, and safety protocols, and removes the 'L' restriction from your CDL.
Knowledge test to remove 'L' restriction (no air brakes) from CDL
Topic Breakdown
Air Brake System Components
~8 questions
- Compressor and reservoir systems
- Brake chambers and slack adjusters
- Air lines and fittings
Inspection and Testing
~7 questions
- Pre-trip inspection procedures
- Air pressure tests
- Brake adjustment checks
Safe Driving Practices
~6 questions
- Proper braking techniques
- Following distance requirements
- Downhill braking procedures
Emergency Procedures
~4 questions
- Air pressure loss procedures
- Emergency braking systems
- Brake failure protocols
Free Practice Questions
10 questionsQuestion 1 of 10
A slack adjuster free play needs to be adjusted if it is more than about ____ when you pull hard on it.
Browse Georgia Air Brakes Questions
- 1. A slack adjuster free play needs to be adjusted if it is more than about ____ when you pull hard on it.
- 2. Which procedure is used in controlled braking?
- 3. Why drain water from compressed air tanks?
- 4. What is the purpose of the modulating control valve (when equipped)?
- 5. The most common type of foundation brake found on heavy vehicles is the:
- 6. The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
- 7. The safety valve is set automatically when pressure is:
- 8. To check the free play of manual slack adjusters of S-cam brakes, you should park on:
- 9. The spring brakes of a tractor-trailer will activate once air pressure drops to approximately:
- 10. Stab braking:
Study Tips for Georgia
- 1Memorize the 3-part air brake system: service brakes, parking brakes, emergency brakes
- 2Know cut-in pressure (100 psi) and cut-out pressure (125 psi) - exact numbers tested
- 3Learn the air brake lag time: 0.5 seconds for brakes to engage after pressing pedal
- 4Master the air brake inspection: check air loss rate (less than 4 psi in 1 minute)
- 5Remember: never downshift while braking - this is a common wrong answer choice
Georgia CDL Information
Age Requirements
Intrastate: 18+ · Interstate: 21+
CDL Renewal
Every 5 years
ELDT Required
Yes — ELDT (Entry-Level Driver Training) from FMCSA-registered provider
Georgia Department of Driver Services (DDS)
Official CDL Portal →Career Opportunities
Frequently Asked Questions
If you plan to drive a commercial vehicle equipped with air brakes, you must pass the air brakes knowledge test to remove the 'L' restriction from your CDL.
Air Brakes Study Resources
Be Ready for Your Georgia Air Brakes Test
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