[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-454273-105":59,"doc-detail-454273-en":131},{"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":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","air-brakes-test-part-1-practice-questions","AIR BRAKES TEST - Part 1 - Practice Questions","","AIR BRAKES TEST practice exam focused on CDL air brake knowledge and safe operating procedures. Covers alcohol evaporator purpose, gauge readings during brake application, brake fade indicators, S-cam function, dual system low-air warning actions, pressure build-up expectations, slack adjuster adjustment criteria, proper service-brake checks, emergency stopping and controlled braking methods, braking components contact surfaces, stopping-distance considerations, air-brake use on downgrades, air-brake lag, fanning effects, compressor cut-off pressure, and safety valve settings. Includes additional guidance on spring brakes, parking brakes use timing, and manual slack adjuster free play checks.",{"@graph":69,"@context":123},[70,84,106],{"@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-brakes-test-part-1-practice-questions/454273/",{"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-brakes-test-part-1-practice-questions/454273.png","ImageObject",300,407,{"name":92,"@type":93},"WPS_1790064749","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-22","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",13,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What should you do if a low air pressure warning comes on for the secondary dual air brake system?","Question",{"text":113,"@type":114},"Bring the vehicle to a safe stop and continue only when the system is fixed.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How can you check that the service brakes are working properly?",{"text":118,"@type":114},"Park on level ground, wait for normal air pressure, release the parking brake, move forward slowly (about 5 mph), and apply the brakes firmly using the brake pedal.",{"name":120,"@type":111,"acceptedAnswer":121},"What is emergency controlled braking?",{"text":122,"@type":114},"Brake as hard as you can without locking the wheels; if the wheels lock, release the brakes and put them back on again when the wheels start rolling.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},454273,1790974007,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":34,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},3985747859154,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Diesel Truck Driver Training  \nSchool Inc.  \nCommercial Driver License  \nPractice Exams  \nC-2:  \nAIR BRAKES TEST  \nHOME OFFICE  \n7190 Elder Lane  \nSun Prairie, WI 53590  \n608-837-7800  \n© Diesel Truck Driver Training School 2009 1  \nC:\\Users\\Andy\\Desktop\\C‐2 Air Brake Test.doc  \n2  \nAIR BRAKES TEST  \n1. If your vehicle has an alcohol evaporator, it is there to:  \nA. Rid the wet tank of alcohol that condenses and sits at the bottom  \nB. Eliminate the need for daily tank draining  \nC. Reduce the risk of ice in air brake valves in cold weather  \n2. The application pressure gauge shows how much air pressure you:  \nA. Have in the air tanks  \nB. Have in the modulating control valve  \nC. Are applying to the brakes  \n3. You should know that your brakes are fading when:  \nA. You have to push harder on the brake pedal to control your s peed on a downgrade  \nB. The brake pedal is spongy when pressure is applied  \nC. Pressure on the brake pedal is released and speed increases  \n4. The S-cam:  \nA. Controls the flow of air into each of the brake chambers  \nB. Pulls the brake shoes away from the drum and allows the wheels to roll freely  \nC. Forces the brake shoes against the inside of the brake drum  \n5. Your vehicle has a dual air brake system. If a low air pressure warning comes on for the secondary system, you should:  \nA. Bring the vehicle to a safe stop and continue only when the system is fixed  \nB. Reduce your speed and test the remaining system while underway  \nC. Reduce your speed and drive to the nearest garage for repairs  \n6. 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 within   seconds:  \nA. 15  \nB. 30  \nC. 45  \n7. A slack adjuster probably needs to be adjusted if it moves more than about   inch when you pull hard on it:  \nA. 1  \nB. 1/2  \nC. 1/4  \n8. How should you check that your service brakes are working properly?  \nA. Park on a slight incline, drain off air pressure, set parking brakes, and check for movement  \nB. Park on level ground, wait for normal air pressure, release the parking brake and move truck forward slowly (about 5 mph), and apply the brakes firmly using the brake pedal  \nC. Park on level ground, chock the wheels, engage the parking brake when you have the correct amount of air pressure to do so, and shut off the engine  \n9. If you must make an emergency stop, brake so you:  \nA. Can steer and your vehicle stays in a straight line  \nB. Can steer hard while braking hard  \nC. Use the hand brake first  \n10.When the brakes are applied, the brake shoes (or linings) are pressed against the:  \nA. Slack adjuster  \nB. Brake drum  \nC. S-cam  \n11. Under ideal conditions, a truck with air brakes going 55 mph would require a stopping distance of:  \nA. More than 400 feet  \nB. 100-300 feet  \nC. Less than 100 feet  \n12. The use of air brakes on a long and/or steep downgrade under normal conditions is only a supplement to:  \nA. The braking effect of the engine  \nB. The use of the front brake limiting valve  \nC. The use of the spring brakes  \n13. The air brake lag distance at 55 mph on dry pavement adds about   feet to your stopping distance.  \nA. 12  \nB. 32  \nC. 52  \n14. Repeatedly pressing and releasing (fanning) the brake pedal may result in:  \nA. A loss of air pressure  \nB. A build up of brake air pressure  \nC. No change in air pressure  \n15. The air compressor should stop pumping at about   psi.  \nA. 100  \nB. 150  \nC. 125  \n16.All air brake equipped vehicles have:  \nA. A supply pressure gauge  \nB. An air use gauge  \nC. A backup hydraulic system  \n17. Emergency controlled braking is when you:  \nA. Apply the brakes as hard as you can without locking the wheels  \nB. Brake as hard as you can, release the brakes when the wheels lock, and put the brakes back on again when the wheels start rolling  \nC. Apply the hand valve for one second, then push hard on the brake pedal  \n18. The braking power of the spring brakes:  \nA. Is not affected","cbCaiaI9mPHEv2SQ","https://ap.wps.com/l/cbCaiaI9mPHEv2SQ","pdf",129843,"English","# AIR BRAKES TEST\n## Practice Questions (1-25)\n## Answer Key","[{\"question\":\"What should you do if a low air pressure warning comes on for the secondary dual air brake system?\",\"answer\":\"Bring the vehicle to a safe stop and continue only when the system is fixed.\"},{\"question\":\"How can you check that the service brakes are working properly?\",\"answer\":\"Park on level ground, wait for normal air pressure, release the parking brake, move forward slowly (about 5 mph), and apply the brakes firmly using the brake pedal.\"},{\"question\":\"What is emergency controlled braking?\",\"answer\":\"Brake as hard as you can without locking the wheels; if the wheels lock, release the brakes and put them back on again when the wheels start rolling.\"}]","AIR BRAKES TEST - Part 1 - Practice Questions | PDF",1790740425,18]