Before positioning a converter dolly for coupling, you should release the dolly’s spring brakes. Do this by:
Answers
Using the dolly parking brake control.
Removing the air tank petcock.
Raising the dolly support.
The Correct Answer and Explanation is :
The correct answer is: Using the dolly parking brake control.
Explanation:
A converter dolly is a piece of equipment used to convert a single trailer into a double or triple combination. It is essential to ensure that the dolly is properly positioned and prepared for coupling before moving the trailer or tractor.
The dolly has a spring brake system to keep it securely in place when it is not in use. The spring brakes work by using the compression of springs to hold the dolly in a stationary position when air pressure is not available. Before coupling the dolly to a trailer or tractor, it is necessary to release these spring brakes to allow the dolly to move freely and to ensure safe maneuvering.
Here’s a breakdown of the correct steps and why “using the dolly parking brake control” is the right option:
- Using the dolly parking brake control: This is the proper way to release the spring brakes on the converter dolly. The dolly is equipped with a parking brake control that, when activated, releases the tension in the springs, allowing the dolly to roll freely. This is necessary for safe coupling and maneuvering. Releasing the spring brakes will ensure that the dolly can be moved easily without any resistance from the brakes.
- Removing the air tank petcock: This is not the correct method for releasing the spring brakes. The air tank petcock is typically used for draining moisture from the air tank, not for releasing brakes.
- Raising the dolly support: Raising the dolly support may be necessary for adjusting the height of the dolly, but it does not directly release the spring brakes. Raising the support would only change the position of the dolly, not the brake mechanism.
By using the dolly’s parking brake control, the spring brakes are disengaged, and the dolly is ready for safe coupling to the trailer or tractor. Always ensure the brakes are properly released before attempting to move the dolly.