What should you check regarding the converter dolly's own brakes before coupling it into a combination?

Pick an answer

1. Only the tractor's brakes matter for the whole combination
2. Dolly brakes are only checked once a year during scheduled maintenance
3. That the dolly's air brakes function properly, since it has its own axle and braking components
4. Converter dollies do not have their own brakes and rely entirely on the trailers ahead of them

Correct!

Not quite. The correct answer is highlighted.