California CDL Air Brakes: Spring Test 2026

Spring brakes are the reason a loaded trailer does not roll away when the air is gone, and this California CDL spring and parking brakes test makes you explain how that works. Instead of air pushing the brakes on, powerful springs hold them on and air pressure holds the springs back. Lose enough pressure and the springs win - which is a safety feature, not a malfunction.

The 2026 CDL air brakes parking brake practice test drills the yellow diamond parking control, the red trailer air supply knob, why you never pump the pedal to release a set spring brake, and why chaining the brakes down or driving with the parking brake partly applied is a serious mistake. It also covers when a parking brake should and should not be used - such as on a truck with hot brakes or on ice.

California DMV bases these questions on the California CDL Manual, and that manual lists how many questions the air brakes exam actually contains, so verify the number there.

Keep going:

• California Air Brakes Practice Test
• California Air Brakes Practice Test 2
• California Air Brakes Practice Test 3
• California CDL Air Brakes Test
• California CDL Practice Test
• California CDL Combination Practice Test
• California CDL Pre-Trip Inspection Practice Test
• California Hazmat Practice Test
• California Class A CDL Practice Test
• California CDL Practice Test

Every question traces back to the California CDL Manual - skim the right-of-way and signs chapters before your retake.