To release a dolly’s spring brakes before positioning the converter dolly for coupling, you should:
Answers
Use the dolly parking brake control.
Remove the air tank petcock.
Raise the dolly support.
The Correct Answer and Explanation is :
To release a dolly’s spring brakes before positioning the converter dolly for coupling, you should use the dolly parking brake control.
Explanation:
A converter dolly is a device used to connect two trailers, enabling a tractor to pull multiple trailers in a double or triple configuration. These dollies are equipped with braking systems to ensure safety during operation.
There are two primary types of braking systems found in converter dollies:
- Spring Brakes: These are mechanical brakes that engage automatically when air pressure drops below a certain level, providing a fail-safe in case of air system failure.
- Air Brakes: These brakes rely on compressed air to function and require a sufficient air supply to operate effectively.
Before coupling a converter dolly to a trailer, it’s essential to release the dolly’s brakes to allow for smooth movement and proper alignment.
- For Spring Brakes: You can release the brakes by using the dolly parking brake control. This action disengages the spring brakes, allowing the dolly to move freely.
- For Air Brakes: You can release the brakes by opening the air tank petcock. This action allows air to flow into the braking system, releasing the brakes.
It’s important to note that raising the dolly support is a separate action performed after releasing the brakes. Raising the support ensures that the dolly is properly positioned and ready for coupling.
By following these procedures, you ensure that the dolly is correctly prepared for coupling, promoting safety and efficiency during the operation.