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ROBERT
AIR BRAKES
| Question | Answer |
|---|---|
| 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 tanks fall 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 a alcohol evaporator, it is there to: | Reduce the risk of ice in air brake valves in cold weather |
| If your truck has 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 the wheels, and turn off the parking brakes |
| Of the choices below, the first thing to do when a low air pressure warning light comes on is: | top and safely park as soon as possible |
| The air compressor governor controls: | When air is pumped into 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 |
| 1If you must make a emergency stop, brake so you: | Can steer and your vehicle stays in a straight line |
| If you don’t have automatic tank drains, how often should you drain the oil and water from the bottom of the 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, everyday during cold weather you should: | Check 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 the 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 fixed. |
| During normal driving, spring brakes are usually held back by: | Air pressure |
| In air brake vehicles, the parking brakes should be used | Any time the vehicle is parked |
| Emergency stab braking is when you | Brake as hard as you can, release the brake when the wheels lock, then put the brakes on again when the wheels start rolling. |
| A straight truck air brake system should not leak at a rate 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 how 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 |
| Before driving a vehicle with a dual air system, allow time for the air compressor to build up to a minimum of ______ psi pressure in both primary and secondary systems. | 100 |
| 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 |
| Which of the following makes total stopping distance longer for air brakes than for hydraulic brakes: | Brake lag |
| If the air compressor develops a leak, what keeps the air in the tanks? | The one-way check valve |
Created by:
lramire