Air Break Practice Test

Results

#1. If you uncouple and park an old, single-circuit trailer, you should do which of the following?

Make sure the trailer is dynamited.

Block (chock) the wheels.

Make sure the brakes are properly adjusted.

Make sure the spring brakes are in the correct position.

A single-circuit trailer has only one braking circuit. And an old trailer might not have a backup braking system (such as spring brakes) either. Hence, if air pressure is slowly lost in that one braking circuit, the trailer brakes will release and the trailer might roll away. To prevent this, block (chock) the trailer wheels as a precaution.