CDL Air Brakes Endorsement Questions and Answers Already Passed

CDL Air Brakes Endorsement Questions and Answers Already Passed To check the slack adjusters on S cam brakes, you should: Wear gloves and pull hard on each slack adjuster. To test the low pressure warning signal, you should (3): * Shut the engine off * Turn the electrical power on * Step on and off the brake pedal to reduce air pressure. With dual air systems, the air pressure should build: From 85 to 100 psi in 45 seconds. With single air systems, the air pressure should build: From 50 to 90 psi in 3 minutes. To test air leakage rate you should: Turn off the engine and release the service brake. To check the air compressor governor "cut in" and "cut out" pressures (3): * Run the engine at a fast idle * Pump the brake to reduce tank pressure * Monitor the air pressure gauge The governor allows the air to start pumping again when it reaches the cut in level or around: 100 psi The governor stops pumping air when it reaches the "cut out" level, or around: 125 psi You should use the parking brake: Any time you park. To test your service brakes you should: Release the parking brake, move forward slowly and press the brake pedal. A combination vehicle air brake system should not lose air faster than: 3 psi per minute The safety valve in the air compressor tank is set to open at: 150 psi When the safety valve releases air it means that (3): * The pressure has exceeded 150 psi * Too much air is in the air compressor * Something is wrong and you should have it checked by a mechanic When the low pressure warning is activated, you should: Bring the vehicle to a safe stop while you still have braking control. Stab braking occurs when you (3): * Press on the brake pedal as hard as you can * Release the brakes when the wheels lock up * Apply the brakes when the wheels start rolling A fully charged air system typically has how many psi? 125 psi Compressed air is stored: In the storage tank(s) The Air Compressor Governor controls: When the air compressor pumps air into the storage tanks. Which type of brake is the most common in commercial