Apply the brakes as hard as possible without locking the wheels.

Apply the brakes with about half-force.

Apply the brakes until the wheels lock.

Pump the brakes.

Allow rain water to enter the tank.

Are used to drain water and compressor oil from the air tank.

Should never be opened.

Must remain open during transit.

Has a single air brake system, but uses two sets of controls.

Has one air brake system for each side of the truck.

Has two brakes for each wheel.

Has two separate air brake systems, but uses a single set of controls.

Are necessary for the proper function of the air brake system.

Should be added if low.

Should be removed regularly.

Are not concerns.

Move a lever to the right.

Push in the yellow, diamond-shaped knob.

Pull out the yellow, diamond-shaped knob.

Pull up on the steering column.

Every day

Once a week

Once a month

Once every 3,000 miles

Application pressure gauge

Air compressor governor

Supply pressure gauge

Drum brake

Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.

Apply the brakes about halfway, but allow the wheels to keep rolling.

Apply the brakes completely until the wheels lock up and the vehicle stops.

Apply the emergency brake until the vehicle starts to slow.

Continue driving normally.

Activate your hazard lights and continue driving.

Call the local law enforcement agency.

Safely exit the roadway and stop.

None of the brakes will work at all.

Either the front or rear brakes will not be operating fully.

There will be no noticeable affect.

Lights on the outside of the tractor will flash.

Ride the brakes all the way down the hill.

Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.

Apply the brakes only near the bottom of the downgrade.

Apply consistent pressure to the brake pedal all the way down the hill.

Press down the brake pedal.

Lift the brake pedal toward them.

Push in the brake knob.

Pull out the brake knob.

By tapping the brake pedal three times

By pushing in the brake control knob

By starting the vehicle

By tapping the accelerator twice

Air brakes

Solid brakes

Liquid brakes

Gravity brakes

Have air pressure in the braking system even when the vehicle is not running.

Maintain some air pressure in the braking system when the vehicle is not running.

Must be run to build air pressure to allow the brakes to operate properly.

Maintain air pressure when shut off for periods of less than four hours.

Each system has separate air tanks, hoses, and lines.

The systems share air tanks, but each has its own separate hoses and lines.

Each system uses the same lines and hoses.

One system is the main braking system and a second system is ready to be used if the first one fails.

Controls when the air compressor pumps air into the air storage tanks.

Controls how quickly air leaves the air storage tanks.

Controls the temperature of the air entering the air storage tanks.

Controls the temperature of the air leaving the air storage tanks.

Regularly.

If there is too little pressure.

If there is too much pressure.

After every stop.

Should not be used in cold weather.

Are helpful to remove water and oil from the air tanks.

Are used to move air to the brakes.

Clean the air in the passenger compartment.

The air from the other system will be used to supplement the system with the low pressure.

The front or rear brakes may not work properly.

All brakes will be inoperable.

The low system will use an auxiliary system to fill the tank.

If your vehicle is stopped on a level surface.

If your vehicle is stopped on a slight incline.

If your vehicle's brakes are very hot.

If your vehicle's other braking systems seem to be working adequately.

By using a diamond-shaped yellow knob.

By using a round red knob.

By using a square green knob.

By using a black round knob.

By tapping on the brake pedal three times

By pushing in the brake control knob

By engaging the accelerator

By tapping the accelerator twice

Are not required on trucks.

Are only required on trailers.

Are required on tractors.

Are optional.

Single air brake systems.

Dual air brake systems.

Triple air brake systems.

Quadruple air brake systems.