Laws vary by country. In the US, they are not required to. In other countries, they might be.
yes they do have antilock brakes
yes they do have antilock brakes
Some do, some don't.
To determine if your converter dolly has antilock brakes, check for the presence of an ABS (Antilock Braking System) warning light on the dashboard or an indicator on the dolly itself. Additionally, inspect the brake system for an ABS control module and wiring harness, which are typically associated with antilock systems. You can also refer to the manufacturer's specifications or the owner's manual for confirmation. If in doubt, consult a professional mechanic for assistance.
Yes. Congears are required to have the same FMVSS121 compliant system which trucks and trailers must have.
what should you check for when inspecting the coverter dolly?
In the US, they do not. Requirements for congears to have spring brakes may exist in other countries, however.
They're not just on tractor-trailers - you'll find them on most air brake equipped vehicles. Spring brakes can be described as parking brakes. That's the simple answer. They are brakes which are held down by a spring. When air pressure is introduced into the system, via the service air system, the air pushes against those brakes, forcing the spring to compress, and releasing the brakes. The air pressure must remain constant in order for the spring brakes to remain released.
Only on air brake vehicles.
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were should you hook coverter dollys an not hook them
To store a converter dolly, first ensure that it is clean and free from debris. Securely attach the safety chains and make sure the coupler is in the locked position. Store the dolly in a designated area, preferably on a flat surface, and consider using wheel chocks to prevent it from rolling. If possible, keep it covered to protect it from the elements.