[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-454308-105":59,"doc-detail-454308-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","air-brake-practice-test","Air Brake Practice Test","","Air Brake Practice Test focuses on core safety knowledge for air-braked vehicles, using multiple-choice questions to check understanding of parking brake use, warning signals, brake-light behavior, and safe driving when components show damage. The questions cover inspection and testing procedures for service brakes, slack adjuster free play, air pressure build-up and leakage limits, emergency stopping actions, and safe response to low-air-pressure warnings. It also addresses safety-valve PSI settings, draining condensate from air tanks, and the effects of brake misuse on performance and overheating.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/air-brake-practice-test/454308/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/air-brake-practice-test/454308.png","ImageObject",300,407,{"name":92,"@type":93},"jayni","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-14","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"When is it OK to leave a truck unattended without applying the parking brakes?","Question",{"text":112,"@type":113},"It is never OK; the safe choice is “Never.”","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What should you do if the low air pressure warning comes on for only one system?",{"text":117,"@type":113},"Reduce speed and stop right away and safely park. Continue only after the system is fixed.",{"name":119,"@type":110,"acceptedAnswer":120},"Why should you drain water from compressed air tanks?",{"text":121,"@type":113},"Water can freeze in cold weather and cause brake failure.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},454308,1790816375,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":44,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144},3985747859343,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","1) When is it ok to leave you truck unattended without applying the parking brakes?  \na) Never  \nb) If you are only away for a few minutes  \nc) If you are conducting a pre-trip inspection  \n2) The stop light switch:  \na) Tells you when the air brake system pressure is low  \nb) Tells you when you need to use your emergency brakes  \nc) Turns on your brake lights to warn drivers behind you  \n3) It is not safe to drive a vehicle that has brake drums with cracks that are longer than the width of the friction area  \na) 1/2  \nb) 1/4  \nc) 1/8  \n4) To test air service brakes, you should:  \na) Stop the vehicle, depress the service brakes, then gently pull against the brakes  \nb) Brake firmly while slowly moving forward  \nc) Brake slowly while moving backward  \n5) A slack adjusters free play needs to be adjusted if it moves more than  inches when you pull hard on it?  \na) 1/4  \nb) 1/2  \nc) 1  \n6) If air pressure is not built up within the proper amount of time, then:  \na) You should be ready to use tour parking brakes to stop  \nb) The alcohol container might be low  \nc) Your air pressure may drop to a low point while driving requiring an emergency stop  \n7) The safety valve reduces pressure at what PSI?  \na) 50  \nb) 100  \nc) 150  \n8) Why should you drain water from compressed air tanks?  \na) The low boiling point of water reduces braking power  \nb) Water can freeze in cold weather and cause brake failure  \nc) Water cools the compressor too much  \n9) If your vehicle has an alcohol evaporator, every day during cold weather you should:  \na) Check and fill the alcohol level  \nb) Change the alcohol from a new bottle  \nc) Check the oil for alcohol content  \n10) The air loss for a straight truck or bus with the engine off and the brakes on should not be more than:  \na) 1 PSI in 30 seconds  \nb) 2 PSI in 45 seconds  \nc) 3 PSI in one minute  \n11) The driver must be able to see a low air pressure warning which comes on before the pressure in the service air tanks fall below   PSI:  \na) 50  \nb) 60  \nc) 80  \n12) The air brake lag distance at 55 MPH on dry pavement adds about   feet:  \na) 12  \nb) 32  \nc) 52  \n13) If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build from 85 to 100 psi in   seconds:  \na) 60  \nb) 30  \nc) 45  \n14) How should you check that your service brakes are working properly?  \na) Park on a slight grade, drain off air pressure, set the parking brake and check for movement  \nb) Park on level ground, chock the wheels, engage the parking brake when you have enough air pressure to do so and shut the engine off  \nc) Park on level ground, wait until normal air pressure is reached, release the parking brake and move forward slowly at about 5 mph. While moving forward, apply the brakes firmly using the brake pedal  \n15) A straight truck or bus air brake system should not leak at a rate greater than   psi per minute with the engine off and the brakes released:  \na) 1  \nb) 2  \nc) 3  \n16) Excessive use of the service brakes results in overheating which can lead to:  \na) Proper adjustment of S cam  \nb) Increased contact between the brake drums and linings  \nc) Expansion of the brake drums  \n17) The safety valve is set to automatically reduce tank pressure at what psi?  \na) 50  \nb) 100  \nc) 150  \n18) If you must make an emergency stop, you should brake so you:  \na) Use the hand brake before the brake pedal  \nb) Can steer and your vehicle stays in a straight line  \nc) Use the full power of the brakes to lock them  \n19) Your truck or bus has a dual air brake system. If your low air pressure warning comes on for only one system, what should you do?  \na) Reduce your speed and drive to the nearest service station for repairs  \nb) Reduce your speed and test the remaining system while under way  \nc) Stop right away and safely park. Continue only after the system is fixed  \n20) The brake pedal in an air brake system:  \na) Controls the speed of the air compressor  \nb) Controls the air pre","cbCair3ya2xenZJx","https://ap.wps.com/l/cbCair3ya2xenZJx","pdf",239449,"English","# Questions\n## Air pressure, warnings, and safety valves\n## Brake testing and adjustment\n## Emergency stopping and safe driving responses","[{\"question\":\"When is it OK to leave a truck unattended without applying the parking brakes?\",\"answer\":\"It is never OK; the safe choice is “Never.”\"},{\"question\":\"What should you do if the low air pressure warning comes on for only one system?\",\"answer\":\"Reduce speed and stop right away and safely park. Continue only after the system is fixed.\"},{\"question\":\"Why should you drain water from compressed air tanks?\",\"answer\":\"Water can freeze in cold weather and cause brake failure.\"}]","Air Brake Practice Test | PDF",1790740471,23]