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Air Brakes Cdl ***
FACTS
| Question | Answer |
|---|---|
| Air loss in a straight truck or bus should not be more than ____ with the engine off and the brakes on. | 3 psi in one minute |
| To make an emergency stop with air brakes, using the stab braking method, you should: | Brake as hard as you can, get off the brakes when the wheels lock, get back on the brakes when the wheels start rolling again. |
| You should know that your brakes are fading when: | You have to push harder on the brake pedal to control your speed on a downgrade. |
| To check the free play of manual slack adjusters on s-cam brakes you should: | Park on level ground, chock the wheels, and release the parking brakes. |
| If the air compressor should develop a leak, what keeps the air in the tanks? | The one way check valve |
| Modern air brake systems combines three different systems. The are the service brakes, the parking brakes and the: | Emergency brakes. |
| Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? | After every working day. |
| Why drain water from the compressed air tanks? | Water can freeze in cold weather and cause brake failure. |
| Air brake equipped vehicles must have: | A supply pressure gauge. |
| What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus? | Spring pressure |
| When driving down a long steep hill you should: | Release the brake when you are 5 M.P.H. below your safe speed. |
| The brake system that applies and releases the brakes when the driver uses the brake pedal is the: | Service brake system. |
| The most common type of foundation brakes found on heavy vehicles is the: | S-cam drum |
| Vehicles with air brakes must have: | An air pressure gauge to show the pressure available for braking. |
| The driver must be able to see a warning that is given before air pressure in the service air tanks falls below: | 60 psi |
| Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes. | Brake lag distance. |
| The braking power of the spring brakes: | Depends on the adjustment of the service brakes. |
| The air compressor governor controls: | When air is pumped into the air tanks. |
| The application pressure gauge shows the driver how much pressure: | Is being applied to the brakes. |
| If your vehicle has an alcohol evaporator, every day during cold weather you should: | Check and fill the alcohol level. |
| During normal driving, spring brakes are usually held back by: | Air pressure |
| Air braking takes more time than hydraulic braking because air brakes: | Need to have airflow through the lines to work. |
| In air brake vehicles, the parking brakes should be used: | Whenever the vehicle is parked. |
| The brake pedal in an air brake system: | Controls the air pressure applied to put on the brakes. |
| If your truck or bus has dual parking control valves it means that you can use pressure from a separate tank to: | Release the spring brakes to move a short distance. |
| A straight truck or bus air brake system should not leak at a rate of more than ____ PSI per minute with the engine off and the brakes released. | 2 |
| If your vehicle has an alcohol evaporator, it is there to: | Reduce the risk of ice in air brake valves in cold weather. |
| If you must make an emergency stop, you should brake so that you: | Stay in a straight line and can steer. |
| Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do? | Stop. Safely park, and continue only after the system is fixed. |
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