When too much air pressure is lost.

When a control on the dashboard is activated.

When the tires have minimal tread depth.

When the brakes are noisy.

Is not recommended on vehicles with air brakes.

Is required on vehicles with air brakes.

Is optional on vehicles with air brakes.

Be tested once a month.

Only be tested by a trained mechanic.

Be tested before every trip.

The brakes may not work.

The brakes may squeak more than usual.

The brakes will brake unevenly.

The supply pressure gauge

The ABS malfunction lamp

The tractor protection valve

Only on the front wheels of a vehicle.

Only on the rear wheels of a vehicle.

On each wheel of a vehicle.

Once a month.

Once a week.

Twice a week.

Before every trip.

Gray.

Blue.

Yellow.

You should not be concerned as this is a normal process.

There is something wrong with the brakes.

The valve is operational.

32 feet

45 feet

20 feet

Only parts of the parking brake system.

Only parts of the service brake system.

Parts of both the parking and service brake systems.

Only parts unique to the emergency brake system.

Air gauges

Low pressure warning device

Air filter

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 keep the wheels rolling.

Fully apply the brakes, let the wheels lock up, and hold the brake pedal down, keeping the wheels locked until the vehicle stops.

Apply the emergency brake.

Hold only enough air for one braking cycle.

Hold enough air for brakes to be used several times if the compressor stops working.

Do not hold air unless there is an emergency.

Hold enough air for more than 1,000 braking cycles.

Use wheel chocks to prevent your vehicle from moving.

Not use wheel chocks.

Use wheel chocks, but only if you have applied the parking brake.

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.

10 psi in one minute

5 psi in one minute

3 psi in one minute

Green

Orange

Red

Purple

When tank pressure falls below 120 psi.

When tank pressure falls below 55 psi.

When tank pressure falls below 10 psi.

Set the control to normal.

Set the control to the off position.

Set the control to the neutral position.

The air brakes should be used.

Shift into a lower gear, then use brakes to supplement the braking effect of the engine.

The vehicle should be continually downshifted in the place of using the brakes.

The vehicle should be driven on the shoulder.

Press the brake pedal down.

Lift the brake pedal up.

Pull out the air brake knob.

The warning light should activate.

The vehicle will be unable to shift out of gear.

The front lights should flash.

15 minutes.

12 minutes.

Three minutes.

One minute.

A low pressure warning device.

A tube that carries air to the brakes.

A type of air brake system.