What is the maximum applied air-loss rate for a combination vehicle?
Detailed Explanation
With brakes fully applied after the initial pressure drop, a combination vehicle should not lose more than 4 psi per minute.
Correct Answer: 4 psi in one minute
Why This Matters on the CDL Test
This question belongs in your brake safety review. Pay close attention to pressure limits, inspection steps, stopping distance, and warning signs because brake-system mistakes are a common reason CDL applicants miss endorsement questions.
How to Remember It
Say the rule in your own words, then explain why the wrong answers are unsafe or incomplete. That habit makes similar General Knowledge questions easier when the exam changes the wording.
Answer Review
Choose "4 psi in one minute" because this answer matches the safe CDL action for brake system safety. On the knowledge test, the safest answer is usually the one that protects space, control, visibility, legal compliance, or inspection accuracy before the vehicle is put at risk.
Why the other answers are weaker
- 40 psi in ten seconds"40 psi in ten seconds" does not best answer this brake system safety question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
- No loss is ever measurable"No loss is ever measurable" does not best answer this brake system safety question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
Test-Day Checklist
- Read the question once for the topic, then read it again for the exact CDL action being tested in General Knowledge.
- Eliminate answers that sound convenient but skip an inspection, warning sign, or safety step.
- Say the correct rule out loud before moving on so you can recognize it when the exam changes the wording.
Ready to practice for real?
Take our free, full-length General Knowledge practice test. Simulates the actual DMV exam with timed questions.
Start Practice TestRelated Questions
During a static air-leakage test in New York, what is the maximum acceptable loss for a single vehicle?
During a static air-leakage test, what is the maximum acceptable loss for a combination vehicle?
With the service brake fully applied, what one-minute pressure loss is excessive for a New York CDL combination vehicle air-brake check?
A New York CDL applicant plans to drive a vehicle equipped with air brakes. Which extra knowledge test is needed?
A New York CDL driver with air brakes should test the low pressure warning signal when?
Keep Studying General Knowledge
Question pages help you review one rule at a time. To build test-day speed, move back into the full General Knowledge practice test and answer a mixed set without looking at the explanation first.
State CDL Practice Paths
After you understand this answer, use a state practice path to connect the federal CDL rule with the DMV test pages drivers search for most.