CDL Air Brakes Endorsement Exam Questions & Answers

CDL Air Brakes Endorsement Exam Questions & Answers Meet and see me (Barry Branton) at    • Meet Barry Branton. Thanks For Watching My...   Air Brakes Playlist:    • CDL Air Brakes Exam 1   My policy on answering questions: If you ask me a question and I give you answer, please don't go back and delete your question. It may be that some other person could learn from your question. The reason that I say that is if somebody asks me a question and that person later decides to delete the question, if I answered that question, then my answer will be deleted with that question should that question be deleted. --------------------------------------------------------- The Problem with Question #28 and Question #30: Question 28. The air loss rate for a STRAIGHT TRUCK or BUSS with the ENGINE OFF and the BRAKES ON should not be more than: ANSWER: 3 PSI in ONE MINUTE. Question 30. The air brake system for a STRAIGHT TRUCK or BUS should not leak at a rate of MORE than HOW MANY PSI per minute with the ENGINE OFF and the BRAKES RELEASED. ANSWER: 2 PSI. My comments: Although the two questions appear similar, they are not the same. Question 28 has the BRAKES ON. Question 30 has BRAKES RELEASED. Is BRAKES ON the same as BRAKES RELEASED? No. They are not the same. Brakes on means that the brakes are engaged. Brakes released means that the brakes are not engaged. In my opinion, the final authority is the CDL manual. https://www.fmcsa.dot.gov/sites/fmcsa... However, you may not be always able to find the correct answer in the manual, so I use Google sometimes. Question 28 with explanation: https://cdl-prep.com/question/the-air... (Answer: 3 PSI in 1 minute) (Explanation: The driver then holds the foot brake for 1 minute after stabilization of the air gauge. The driver checks the air gauge to see that the air pressure drops no more than 3 pounds (PSI) in one minute for single vehicles and 4 pounds in one minute for combination vehicles and listens for air leaks.) Source: listed above URL.) Question 30 (look at third card) https://www.flashcardmachine.com/air-... (Answer: 2 PSI) --------------------------------------------------------- The problem with Question #8 and Question #25. Question #8:    • CDL Air Brakes Endorsement Exam Questions ...   8. The driver must be able to see a low pressure warning that comes on before pressure in the service air tank falls below: ANSWER: 60 PSI. Question #25:    • CDL Air Brakes Endorsement Exam Questions ...   25. The driver must be able to see a warning before pressure in the service tanks falls below HOW MANY PSI. ANSWER: 55 PSI. Answer the following question: The driver must be able to see a low pressure warning that comes on before pressure in the service air tank falls below HOW MANY PSI. [a] 60 PSI. [b] 55 PSI. [c] Neither a or b. [d] All of the above. The correct answer is, "What does the manual say?" 5.2 – Dual Air Brake, Paragraphs 5 & 6. Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems. Watch the primary and secondary air pressure gauges (or needles, if the system has two needles in one gauge). Pay attention to the low air pressure warning light and buzzer. The warning light and buzzer should shut off when air pressure in both systems rises to a value set by the manufacturer. This value must be greater than 60 PSI. The warning light and buzzer should come on before the air pressure drops below 60 PSI in either system. If this happens while driving, you should stop right away and safely park the vehicle. If one air system is very low on pressure, either the front or the rear brakes will not be operating fully. This means it will take you longer to stop. Bring the vehicle to a safe stop, and have the air brakes system fixed. #barrybranton #cdl #clp