Drains the water and compressor oil from the air tanks.

Prevents air from escaping if the air compressor has a leak.

Activates the emergency brakes when there is a leak.

Holds the spring brakes in position until they are used.

One half

One quarter

One third

One tenth

The water and oil are siphoned out of the tank.

A drain valve is opened to remove the water and oil from the tank.

The water and oil are removed automatically as the brakes are used.

A sponge is used to soak up the water and oil.

Engage and disable the parking brake.

Rapidly press and release the brake pedal.

Open the rear shut-off valves.

Uncouple and recouple all glad hands.

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.

A service brake system

A parking brake system

An emergency brake system

An axle brake system

Lock the wheels and skid to a stop.

Stop in a way that keeps your vehicle in a straight line.

Stop in a way that turns your vehicle.

Expect your vehicle to slow down more quickly than usual.

10 psi in a minute.

8 psi in a minute.

6 psi in a minute.

4 psi in a minute.

Reduce normal braking capacity.

Are equipped in addition to other braking systems and do not reduce normal braking power.

Are not effective on larger vehicles.

Are illegal in some states.

Prevent the front tires from skidding.

Prevent the front tires from overheating.

Create equal brake usage.

Remove uncertainty when applying the brakes.

Only on packed snow.

Under all conditions.

Only if the road is dry.

Under most conditions.

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.

Once a week.

Every day.

Every hour.

Once a month.

Water and compressor oil.

Frost.

Gravel.

Antifreeze.

Used whenever you park your vehicle.

Used while driving.

Set when driving in bad weather.

Removed.

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.

Are not required on trucks.

Are only required on trailers.

Are required on tractors.

Are optional.

Braking will only occur if there is enough air in the tanks.

You can brake 14 times before the air in the system runs out.

You should continue to drive normally and check the brake system when it is convenient.

You should continue driving, but turn the emergency flashers on to warn other motorists.

Near the rear brake

Near the front brake

In an air tank

On the dashboard

A warning light will come on.

The vehicle will not shift out of gear.

The front lights will flash.

The vehicle should stop.

Single air brake systems.

Dual air brake systems.

Triple air brake systems.

Quadruple air brake systems.

Park on a hill and test the brakes.

Put on gloves and push in the slack adjusters.

Remove the drum and look inside.

Chock the wheels and disengage the parking brake.

Water and oil

Ammonia

Wood

Chlorine

3 psi in one minute.

6 psi in one minute.

8 psi in one minute.

4 psi in one minute.

There is a decreased risk of jackknifing.

There is an increased risk of jackknifing.

The brakes will not work as effectively as they would without ABS.

The brakes will become more sensitive.