Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Air Brakes
| Question | Answer |
|---|---|
| Which of the following is okay to find in the air brake system? | Air |
| Air loss in a single vehicle (not a combination unit) should not be more than ________ with the engine off and the brakes on. | 3 psi in one minute |
| The vehicle must have a warning device which comes on when the air pressure in the service air tanks falls below: | 60 psi |
| If the air system should develop a leak, what will keep air in the air tanks? | The one-way check valve |
| Which brake system applies and releases the brakes when the driver uses the brake pedal? | The service brake system |
| When using the parking brakes or emergency brakes, what type of pressure is being used? | Spring pressure |
| The air loss rate for a straight truck or bus with the engine off and the brakes applied should not be more than: | 3 psi in one minute |
| Air brake equipped vehicles must have | An air pressure gauge, to show the pressure available for braking |
| Which of the following statements about brakes is true? | The heavier a vehicle or the faster it is moving, the more heat the brakes have to absorb to stop it |
| Three different systems are found on modern air brake systems; service brakes, parking brakes, and: | Emergency brakes |
| The purpose of engine retarders is to: | Help slow the vehicle while driving and reduce brake wear |
| To use the stab braking technique during emergency braking, you: | Brake hard with the pedal until the wheels lock, then get off the brakes until the wheels begin to roll again |
| If your vehicle has an alcohol evaporator, it's there to: | Reduce the risk of ice in the air brake valves in cold weather |
| If your vehicle is equipped with an alcohol evaporator, every day during the winter you should: | Check the alcohol level and fill if necessary |
| The air supply pressure gauge shows the driver how much pressure: | Is available in the air tanks |
| The most common type of foundation brake found on heavy commercial motor vehicles is: | S-cam drum |
| A straight truck or bus air brake system cannot leak more than how many psi per minute with the engine off and the brakes released? | 2 psi |
| How do you check the free-play in manual slack adjusters? | Park on level ground, chock wheels, release-the parking brakes and pull slack adjusters„ |
| Which of the following answers is most correct about brake use on a long and steep downgrade? | Use the braking effects of the engine, and when the vehicle speed reaches the "safe" speed, apply brakes firmly until vehicle speed is reduced to approximately 5 mph below "safe" speed |
| When a failure occurs in the service brake system, the system you need to use to stop the vehicle is the: | Emergency brake system |
| If your truck or bus has dual parking control valves, you can use pressure from a separate tank to: | Release the emergency brakes to move a short distance |
| The air compressor governor controls: | When the compressor will pump air into the storage tanks |
| When you have to make a quick emergency stop, you should brake in a way that allows you to: | Continue in a straight line and maintain steering control |
| What turns on the electrical stop light switch in an air brake system? | Air pressure |
| In air brake equipped vehicles, you use the parking brakes when? | Whenever you park the vehicle |
| What will determine how effectively the spring emergency brakes or the parking brakes work? | The adjustment of the service brakes |
| A combination vehicle air brake system cannot leak more than how many psi per minute with the engine off and the brakes released? | 3 psi |
| The brake pedal: | Controls the air pressure applied to operate the brakes |
| During normal operations, the parking and emergency brakes are usually held back by: | Air pressure |
| Why should you not fan the brakes on and off during long downgrades? | The short time off the brakes does not allow for brake cooling |
| Modern air brake systems combine three different systems. The systems are the service, parking and ________ brake systems. | Emergency |
| The driver must be able to see a warning before air pressure in the service air tanks falls below ________ psi. | 60. |
| The brake pedal in an air brake system: | Controls the air pressure applied to the brakes. |
| Air braking takes more time than hydraulic braking because air: | Takes more time to flow through the lines than hydraulic fluid. |
| If your vehicle has an alcohol evaporator, it is there to: | Reduce the risk of ice in air brake valves in cold weather. |
| If your truck has a dual parking control valves, you can use pressure from a separate tank to: | Release the spring emergency parking brakes to move a short distance. |
| To check the free play of manual slack adjusters on S-cam brakes you should park on: | Level ground, chock wheels, and turn off the parking brakes. |
| Of the choices below, the first thing to do when a low air pressure warning comes on is: | Stop and safely park as soon as possible. |
| The air compressor governor controls: | When air is pumped in to the air tanks, |
| The braking power of the spring brakes: | Depends on whether the service brakes are in adjustment. |
| All vehicles equipped with air brakes have: | A supply pressure gauge. |
| If you must make an emergency stop, brake so you: | Can steer and your vehicle stays in a straight line. |
| If you do not have automatic tank drains, how often should you drain the oil and water from the bottom compressed air storage tanks? | At the end of each day of driving. |
| The application pressure gauge shows how much air pressure you: | Are applying to the brakes. |
| Your brakes are fading when: | You have to push harder on the brake pedal to control your speed on a downgrade. |
| If your vehicle has an alcohol evaporator, every day during cold weather you should: | Check the alcohol level and fill the evaporator if needed |
| Why should you drain water from compressed air tanks? | Water can freeze in cold weather and cause brake failure. |
| Your vehicle has a dual air brake system. If low air pressure warning comes on for the secondary system, you should: | Bring the vehicle to a safe stop and continue only when the system is repaired. |
| During normal driving, spring brakes are usually held back by: | Air pressure. |
| In air brake vehicles, the parking brake should be used: | Anytime the vehicle is parked. |
| Emergency stab braking is when you: | Brake as hard as you can, release the brake when the wheels lock, then push the brakes again when the wheels start rolling. |
| A straight truck brake system should not leak at a rate of more than psi per minute with the engine off and the brakes released. | 2. |
| The air loss rate for a straight truck with the engine off and the brakes on should not be more than: | 3 psi in one minute. |
| The supply pressure gauge shows much pressure: | Is in the air tanks. |
| The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system. | Service. |
| Total stopping distance for air brakes is longer than that for hydraulic brakes due to distance. | Brake lag. |
| The most common type of foundation brake found on heavy vehicles is the: | S-cam drum brake. |
| If the air compressor develops a leak, what keeps the air in the tank? | The one-way check valve. |
| Air brakes take-more time to-activate than hydraulic-brakes because: | It takes air longer to flow through the lines. |
| Why is the stopping distance for air brakes longer than hydraulic brakes? | Brake lag distance. |
| What affects the power of spring brakes? | The adjustment of the spring brakes ensures the power. |
| When the driver uses the brake pedal, which brake system applies and releases the brakes? | Service. |
| A combination of service, parking and ________ systems comprise modern air brakes. | Emergency. |
| What does the air compressor governor control? | The air pumped into the air tanks. |
| You should drain water from compressed air tanks because: | Water can freeze and cause brake failure. |
| In cold weather, what should you do to an alcohol evaporator? | Check and fill the alcohol level. |
| In an air brake system, a brake pedal: | Controls the air pressure applied to the brakes |
| What do all air brake-equipped vehicles have? | An air supply pressure gauge |
| The air supply pressure gauge indicates: | The pressure in the air tank: |
| The purpose of dual parking control valves is: | To release the spring brake in an emergency. |
| On a long downgrade, how can you tell if your brakes are fading? | You have to push harder to control your speed. |
| How should the free play of manual slack adjusters on S-cam brakes be checked? | Park on level ground, chock the wheels, turn off the parking brakes. |
| What does the application pressure gauge show? | How much air pressure you are applying to the brakes. |
| The air pressure warning light should come on before the pressure gets below: | 60 psi. |
| What are spring brakes held back by? | Air pressure. |
| If there is a leak in the air brake system, the parking or emergency brake can be held in position only by: | Spring pressure. |
| With the engine off and the service brake released, a straight truck air brake system should not leak at a rate greater than: | 2 psi per minute. |
| You have a problem if you are testing the service brakes and notice that: | They have an unusual feel. |
| The vehicle pulls to one side. | |
| Stopping action is delayed. | |
| D.All of the above. | |
| The dual air brake system operates on which axle(s)? | All axles. |
| What should you do if the secondary system of a dual air brake equipped vehicle fails? | Bring the vehicle to a safe stop and get the system fixed. |
| When checking to make sure the spring brakes come on automatically, the parking brake knob should pop out when: | The air pressure falls to between 20 and 40 psi. |
| During an emergency stop, how should you brake? | Brake so you can steer and stay in a straight line. |
| Emergency stab braking is: | Repeatedly braking until the wheels lock, and then releasing pressure. |
| Why is controlled or stab braking better than short, light brake pedal pressure on long downhill grades? | Light pressure heats up the brakes. |
| When the low air pressure warning comes on, you should: | Stop and park as soon as possible. |
| When do you use the parking brake in air air brake-equipped vehicle? | Any time you park. |
| If it is not done automatically in your vehicle, how often should you drain your air tanks? | At the end of each day of driving. |
| What are the three braking systems? | The service brake and parking brake and emergency system. |
| What is used to make the brakes work? | Compressed Air. |
| What does the air compressor do? | Pumps air into the air storage tanks. |
| What does the air compressor governor control? | It controls when the compressor will pump air into the air storage tanks. |
| How much compressed air must the storage tanks hold? | Enough air to allow brakes to be used when the air compressor stops working. |
| If oil and water collect in the air tanks what can happen to the brakes? | The brakes can fail. |
| No automatic tank drains – when should you drain the air tank? | Every day. |
| Where will you find the drain valve for each air tank? | In the bottom of the tank |
| What are the two types of air tank drains? | Manually operated. . .Automatic. |
| What is a purpose of an alcohol evaporator? | It reduces risk of ice in brake valves and other parts in cold weather. |
| How often should you check the alcohol evaporator in cold weather? | Check the alcohol container and fill up as necessary every day. |
| What is a purpose of the safety release valve in the first tank? | It protects the tank and the rest of the system from too much pressure. |
| What are two other names for the brake pedal? | It can be called the foot valve or treadle valve. |
| What can happen if the brake pedal is pressed and released too often? | Air can be let out of the system faster than the compressor can replace. |
| Where are foundation brakes found? | At each wheel. |
| Where are brake shoes and linings located? | Inside each brake drum. |
| What happens when a brake lining is pushed against the inside of the drum? | This causes friction which slows the vehicle and creates heat. |
| On S-Cam brakes what happens to the air when you push the brake pedal? | Air pressure forces out the push rod and moves the slack adjuster. |
| Which direction does the S-Cam force brake shoes when brakes are applied? | It presses them against the inside of the brake drum. |
| If the air compressor begins to leak what keeps air in the tanks? | The one-way check valve. |
| What is one kind of gauge that is required for vehicles with air brakes? | An air pressure gauge. |
| What kind of warning signal is required on vehicles with air brakes? | A low air pressure warning signal. |
| What are the three types of low air pressure warning devices? | A red light ...or a buzzer ...or a wigwag |
| What is used to turn on the stop lights in an air brakes system? | An electric switch that works by air pressure. |
| In normal driving parking and emergency brakes are usually held back by? | Air pressure. |
| The effectiveness of the spring brakes are usually held back by? | Service brakes. |
| Why do some buses have a separate air tank to release spring brakes? | So you can move the vehicle in an emergency. |
| What is a dual air brake system? | Two separate air brake systems with a single set of brake controls. |
| What should you look for in checking an air compressor belt? | Check belts for excessive wear and cracks and tightness. |
| What should you do before checking free play in manual slack adjusters? | Park on level ground and chock the wheels and release parking brakes. |
| Combination vehicle: brakes released. The maximum air released? | Less than three pounds per square inch. |
| Single vehicle: brakes released. Maximum air leakage in one minute? | Less than two pounds per square inch. |
| After applying brakes fully, maximum air loss in one minute – single vehicles? | Three pounds per square inch. |
| After applying brakes fully max. air loss in one minute – combination vehicle? | Four pounds per square inch |
| When should the air governor cut out the air compressor? | At about the manufacturer specified air pressure. |
| When making a normal stop when should you push in the clutch? | Do not push the clutch in until the engine R.P.M.'s are down close to idle. |
| When making a very quick stop you should brake so that you? | Stay in a straight line and can steer. |
| What is another name for controlled braking? | Squeeze braking. |
| What is stab braking? | Pressing the brake pedal and releasing brakes when wheels lock up. |
| Why does air braking take more time than hydraulic braking? | Because it takes time for air to flow through the lines to the brakes. |
Created by:
kevin18st