Why should you not apply the clutch when driving on a long, steep downhill slope?

When driving down a long, steep slope, you should not press the clutch because doing so disconnects the engine from the wheels. This means the engine cannot help slow down the vehicle through engine braking (answer 1). Without engine braking, you rely solely on the brakes, which can overheat and wear out quickly (answer 2). Using the engine to control your speed reduces brake wear and increases safety. The third option is incorrect because the brake servo unit still functions regardless of clutch use. So, keeping the clutch engaged allows the engine to provide braking support.