CDL Air Brakes Endorsement
To check the slack adjusters on S cam brakes, you should: - Answer- Wear gloves and pull hard on each slack adjuster. To test the low pressure warning signal, you should (3): - Answer- * 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: - Answer- From 85 to 100 psi in 45 seconds. With single air systems, the air pressure should build: - Answer- From 50 to 90 psi in 3 minutes. To test air leakage rate you should: - Answer- Turn off the engine and release the service brake. To check the air compressor governor "cut in" and "cut out" pressures (3): - Answer- * 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: - Answer- 100 psi The governor stops pumping air when it reaches the "cut out" level, or around: - Answer- 125 psi You should use the parking brake: - Answer- Any time you park. To test your service brakes you should: - Answer- Release the parking brake, move forward slowly and press the brake pedal. A combination vehicle air brake system should not lose air faster than: - Answer- 3 psi per minute The safety valve in the air compressor tank is set to open at: - Answer- 150 psi When the safety valve releases air it means that (3): - Answer- * 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 t
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- Uploaded on
- April 1, 2023
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- 3
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- 2022/2023
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- Exam (elaborations)
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- Questions & answers
