3 psi

5 psi

7 psi

9 psi

If they are hot.

In the winter time.

If they are used frequently.

A drain valve.

A lock.

A trap door.

A warning sticker.

Application pressure gauge

Air compressor governor

Supply pressure gauge

Drum brake

When the air compressor pumps air into the air storage tanks.

How fast air is pumped into the air storage tanks.

The temperature of air pumped into the air storage tanks.

The speed of the vehicle.

The warning light should activate.

The vehicle will be unable to shift out of gear.

The front lights should flash.

Not use the brake pedal.

Press the accelerator.

Move the steering wheel.

Be especially careful because the brakes may fail.

The brakes are very hot.

The brakes are very cold.

There is snow on the ground.

Green

Yellow

Orange

White

When tank pressure falls below 120 psi.

When tank pressure falls below 60 psi.

When tank pressure falls below 10 psi.

Continue driving, but have the brakes repaired within a week.

Pull over and inspect the brakes.

Phone a mechanic while driving.

Air brakes

Solid brakes

Liquid brakes

Gravity brakes

Help a driver avoid wheel lockup

Lock up the front wheels

Prevent a vehicle from accelerating while traveling uphill

Prevent a vehicle from accelerating while traveling downhill

Pull the air brake lever.

Engage the brake lever.

Push the brake pedal down.

Pull the brake pedal up.

Test the brakes while driving, but continue driving if nothing seems wrong.

Immediately stop driving.

Drive with the hazard lights activated.

Reduce a vehicle's normal braking capacity.

Are in addition to other braking systems and do not reduce a vehicle's braking power.

Are not effective on larger vehicles.

Let the vehicle warm up before driving to ensure that fuel reaches the engine.

Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.

Begin driving just after the vehicle starts.

Pump the pedal about 20 times to build pressure, then begin driving.

Makes the brakes work without squeaking.

Prevents ice from forming in the braking system.

Lubricates parts of the braking system.

3 psi in one minute.

6 psi in one minute.

8 psi in one minute.

4 psi in one minute.

A type of warning system

A tube used to move air from the compressor to the tanks

A noise made by air brakes when used

A part within the braking unit that allows air to move freely

Can be used to prevent a parked vehicle from moving.

Make it easier for a parked vehicle to roll.

Should only be used on the front driver's side tire.

Green

Blue

Yellow

If they are too hot.

In colder weather.

If they are used.

If they get wet.

The brakes may squeak.

The brakes may not work.

The brakes may be sluggish.

The brakes will be very sensitive.

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.