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Welcome to our new video tutorial on CDL air brakes endorsements Knowledge Test letamp;#39;s get started which of the following is okay to find in the air brake system a oil B air sea water D all of the above answer B the air brake system is designed to use compressed air to operate the braking mechanisms in large Vehicles such as trucks and buses therefore finding air in the air brake system is normal and necessary for proper operation oil and water however are contaminants that can negatively impact the performance and safety of the air brake system air loss in a single vehicle not a combination unit should not be more than with the engine off and the brakes on a 1psi in 30 seconds B1 PSI in one minute C 2psi in 45 seconds D 3psi in one minute answer d for a single vehicle not a combination unit the air loss rate should not be more than 3 PSI in one minute with the engine off and the brakes applied this is a standard used to ensure the air brake system is functioning properly and ma