Web1. When a brake pedal is pressed and the S-cam is turned, the S-cam: Presses the brake shoes against the inside of the brake drum. Tightens the brake drum onto the axle. Presses the brake lining against the wheel. Releases air from the air tanks. 2. What do air brakes use to make the brakes work? Compressed air Outside air Non-compressed air WebPush & hold the Service Brake down for ONE MINUTE. There should be no more than a 3 psi drop in air pressure. This procedure allows you to check for leaks in the air system. Go to …
Inspecting Air Brake System Operation The Official Air ... - Ontario
http://www.cdltestgenius.com/air-brakes-practice-test.php WebAir brakes use compressed air to make the brakes work. Air brakes are a safe and effective means of stopping large and heavy vehicles. Air brakes need to be maintained regularaly … today\u0027s vision bandera
BRAKE PUMP DOWN PRE-TRIP AIR BRAKE TEST - Loudoun …
WebNov 13, 2024 · To do this, the driver must continue to apply and release pressure on the foot brake until the parking brake knob (s) pop out. This must happen before pressure drops to 20 psi, to ensure the failsafe is in proper working order. Service brakes - Before conducting this test, the driver can grab the wheel chocks. WebThe school bus endorsement test can vary from state to state but you can expect the following when taking the written exam: 20 total questions Multiple-choice format Need a passing score of 80% or higher (16 correct answers) The CDL bus driver test will examine your knowledge on the following topics: Danger zones and use of mirrors WebTest Service Brakes. Wait for normal air pressure, release the parking brake and trailer air supply button(for combination vehicles), move the vehicle forward slowly (about 5 mph), … pentagon shortcut