You are in your car towing a trailer which has no brakes and you approach a long steep downhill slope. What is correct?

When towing a trailer without its own brakes, extra caution is needed on steep downhill slopes. You should reduce your speed and, if necessary, select a lower gear early to use engine braking, which helps control your speed without overworking your vehicle’s brakes. In addition, you must take into account the pushing effect of the trailer, as it can make it harder to slow down and increase stopping distances.

Disengaging the clutch frequently (as described in answer 3) actually does the opposite of what is needed; it removes the effect of engine braking and puts more strain on the car’s brakes, which can overheat and become less effective. To be safe, rely on engine braking and maintain control by anticipating the trailer’s behavior. This keeps both your car and trailer stable and helps prevent brake failure.