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DMV Air Brake
Air Brake Practice Test
| Question | Answer |
|---|---|
| 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 |
| 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 psi |
| The air compressor governor controls: speed of the air compressor, air pressure applied to the brakes. when air is pumped into air tanks | when air is pumped into air tanks |
| The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like: Spring, air or hydraulic pressure, | Spring pressure |
| The Brake Pedal in an air brake ssystem: controls the speed of the air compressor, controls the air pressure applied to put on the brakes, is connected to slack adjusters by series of rods and linkage | controls the air pressure applied to put on the brakes |
| Some air brake systems have an alcohol evaporator. what may happen if you don't keep the unit filled with alcohol? | Ice may form in the air storage tanks and cause the brakes to fail |
| The Brake system that applies and releases the brakes when the driver uses the brake pedal is the ___ brake system. Emergency, service, parking | Service |
| Before driving a truck or bus with a dual air brake system, the pressure in each system should be at least ___psi | 100 PSI |
| 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 right away and safely park. Continue only after the system is fixed. |
| How should you check that your service brakes are working properly? | wait for normal air pressure, release the parking brake, shut the engine off and pump the brake pedal to reduce air tank pressure. |
| Emergency Stab braking is when you: | Brake as hard as you can, release the brakes when the wheels lock, and put on the brakes again when the wheels start rolling. |
| If air pressure does not build up to normal within the correct amount of time, then: you should be ready to use your parking brake to help stop. the alcohol container may be low. Your air pressure may drop 2 low during driving, requiring an emergency stop | Your air pressure may drop 2 low during driving, requiring an emergency stop |
| Which of these is not a proper time to apply the parking brakes? if the brakes are very hot, if you will only be stopped for less than one hour, if you're going to test parking brake to make sure that it hold the vehicle | if the brakes are very hot |
| Excessive use of service brakes results in overheating, which can lead to: improper adjustment of the s-cam, increase contact between the brake drums and brake lining, expansion of the brake drums | expansion of the brake drums |
| The proper method of braking when going downhill after selecting proper gear is to brake until your speed is about ___ miles per hour below your "safe" speed, then release your brake | 5 MPH |
| Total Stopping Distance for air brakes is longer than that for hydraulic brakes due to _____ distance | Brake Lag |
| IF you must make an emergency stop, you should brake so you: | can steer and so your vehicle stays in a straight line |
| If your truck or bus 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. |
| The driver must be able to see a warning before air pressure in the service air tanks falls below ___ PSI | 60 PSI |
| The stop light switch | turns on the brake lights to warn drivers behind you |
| For air brake system in good condition, the air compressor should start pumping at about ___ PSI | 100 PSI |
| The air loss rate for a straight truck or bus with engine off and the brakes on should not be more than: | 3 PSI in one minute |
| The Braking power of the spring brakes: | depends on the service brakes being in adjustment |
| How should you check that the spring brakes come on when air pressure in the system drops below a certain level? | Chock the wheels, release the parking brake, shut off the engine, and pump the brake pedal to reduce air tank pressure. |
| If you are driving down a steep downgrade and you have reached your " safe" speed of 40 mph, you would apply the service brakes until your speed drops to ___ MPH | 35 MPH |
| The air brake lag distance at 55 mph on dry pavement adds about ___ feet to the stopping distance | 32 feet |
| Repeatedly pressing and releasing (fanning) the brake pedal may result in: | The loss of brake air pressure |
| Emergency controlled braking is when you: | apply brakes as hard as you can without locking the wheels |
| If your truck's air compressor has its own oil supply, when should you first check the oil level? | before driving |
| The driver must be able to see a low air pressure warning which comes on before pressure in the service tank falls below ___ PSI | 60 PSI |
| If the spring brakes are on, when should you push the brake pedal? | Never |
| 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. |
| If your truck or bus has dual parking control valves, you can use the pressure from the separate tank to: | release the spring emergency/ parking brakes to move a short distance. |
| The brake pedal in an air brake system | controls the air pressure applied to put on the brakes |
| Parking or emergency brakes of truck or buses can legally held on by ___ pressure | Spring |
| the common type of foundation brake found on heavy vehicle is the | S-cam drum |
| If your truck has a dual air system and one of the systems is low on pressure: | Either the front or rear brakes will not be fully operational |
| The air compressor governor controls: | when air is pumped into the air tanks |
| In air brake vehicles, the parking brakes should be used: | anytime the vehicle is parked |
Created by:
Justimo