Passenger Endorsement and Air Brakes Practice Flashcards

A collection of vocabulary flashcards covering key facts, quantities, and safety regulations for the CDL Passenger Endorsement and Air Brakes certification exams.

Safety Space (40 foot bus at 30 mph)

At least $4$ seconds of space in front of the bus.

Hazard

Any condition which may cause your trip to be unsafe, or anyone or anything that may cause an unsafe condition.

Standee Line

The line that all riders must stay behind while the bus is moving.

Emergency Equipment Requirement (Bus)

Fire extinguisher, spare electric fuses (unless equipped with circuit breakers), and reflectors.

Fueling Restriction

Never fuel a bus in a closed building with riders aboard or with any of the windows open.

Emergency Exit Door

Must be closed when operating the bus and sound an alarm when opened.

Unruly Rider Discharge

Choose a place that is as safe as possible.

Baggage and Freight Security

Must be secured so any door or window can be used in an emergency and riders are protected from falling or shifting packages.

Maximum Hazardous Material Weight (Passenger Bus)

Total weight of all material must not be more than $500$ pounds total, and no more than $100$ pounds of any one class.

Recapped or Regrooved Tires

Allowed anywhere on a bus except for the front wheels.

Safety Space (40 foot bus at 50 mph)

At least $6$ seconds of space in front of the bus.

Railroad Crossing Stop Distance

Stop between $15$ and $50$ feet before the nearest track.

Drawbridge Stop Distance

Stop at least $50$ feet before the draw of the bridge if there is no signal light or attendant.

Passenger Endorsement Necessity

Required to drive a bus that seats $16$ or more people including the driver.

Alcohol Evaporator

A device provided to reduce the risk of ice in air brake valves during cold weather.

Application Pressure Gauge

Shows how much air pressure you are applying to the brakes.

Brake Fade

A condition where you must push harder on the brake pedal to control speed, often caused by the brakes getting very hot.

S-cam

An 'S' shaped part that forces the brake shoes against the inside of the brake drum.

Air Pressure Build Rate

In a properly functioning dual air brake system, pressure should build from $85$ to $100$ psi within $45$ seconds.

Slack Adjuster Play

Needs adjustment if it moves more than about $1$ inch when pulled hard.

Total Stopping Distance (55 mph air brakes)

More than $400$ feet under ideal conditions.

Air Brake Lag Distance (55 mph)

Adds about $32$ feet to the stopping distance on dry pavement.

Air Compressor Governor

Controls when the air compressor will pump air into the storage tanks.

Safety Valve Setting

Set to automatically reduce pressure at $150$ psi.

Emergency Controlled Braking

Applying the brakes as hard as you can without locking the wheels to keep the vehicle in a straight line.

Emergency Stab Braking

Braking as hard as possible, releasing when wheels lock, and reapplying when wheels start rolling again.

Spring Brakes

Brakes held back by air pressure that apply automatically via mechanical springs if air pressure drops below a certain level (typically $20$ to $45$ psi).

Low Air Pressure Warning

A signal that must come on before pressure in the service air tank falls below $60$ psi.

Cargo Tie Downs

There should be at least one tie down for every $10$ feet of cargo.

Counter Steering

Turning the wheel back in the other direction after steering to avoid a traffic emergency.

Retarders

Devices used to help slow the vehicle and reduce brake wear, though they can cause skidding when traction is poor.

Steering Wheel Play

Not allowed to have more than $10$ degrees of play.

Slow-Moving Vehicle Marking

A red triangle with an orange center.

Brake System Safety (Spring Leaves)

It is illegal to drive a vehicle if $1/4$ ($25$%) or more of the spring leaves are broken or missing.