I can't believe the engine braking issue is still coming up. Engine braking does not hurt your clutch or your engine in any way.
Others tend to back me up as well....
Petrol and diesel cars manufactured from 1990 onwards, are generally equipped with fuel injection combined with an electronic function that cuts off the engine's fuel supply under engine braking (accelerator released and a gear engaged). The advantages of this fuel cut off function can be used by releasing the accelerator in time, for example when approaching traffic lights. This also reduces wear and tear on the brakes, reducing maintenance costs. Engine braking, not only has a positive effect on fuel consumption, but also on exhaust emissions, traffic safety, traffic flow and passenger comfort.
http://www.ecodrive.org/The-golden-r...ing.249.0.html
Instead of using your brakes to slow your vehicle down on a steep grade, use what is known as "engine braking" (big-rig drivers use something similar called "jake brake").
This is a good idea if you want to:
a) save your brakes a lot of unnecessary wear & tear
b) actually HAVE brakes at the end of the hill!
In fact, you will increase the life of your brakes by a few months (or even years, depending on how much steep downhill driving you do) if you simply use engine braking whenever possible, rather than actually pressing the brake pedal to slow your vehicle.
In short, you are literally using the engine to break the speed of your vehicle traveling downhill.
This does NO harm to the engine itself or any of the inner working parts.
http://thefuntimesguide.com/2005/07/downhilldriving.php
The advantage of using the engine to dissipate energy is this immediate ejection of energy. Hot gases are ejected from the vehicle very quickly and the gases also transfer much of their heat directly to engine parts. In addition, friction produced within the engine system also adds heat to the engine parts.
This engine heat is taken away by the engine's integrated cooling system: usually a liquid circulation system and a radiator. Disc or drum brakes have no such energy dissipation mechanisms. They must rely on air flow to remove heat and they retain heat without producing temperatures that would deform and damage the brakes.
Placing a vehicle in a low gear causes the engine to have more leverage (mechanical advantage) on the road and the road to have less leverage on the engine. This is what allows cars to slow down using their relatively flimsy engine parts. The engine maintains a high rotational speed to dissipate a lot of power without forcing too much strain on the engine.
The exhaust brake is used in large diesel vehicles because the rate of conversion of mechanical energy into waste thermal energy is low compared to the mechanical returns to kinetic energy from the air-spring effect in the engine.
http://en.wikipedia.org/wiki/Engine_braking