Like wiretap_MD, I have been engine braking practically everyday (I live in and around Baguio), tap on the brakes, shift to a lower gear and let the gears do the work, specially on descents. My clutch disk hasn't been replaced since I bought my vehicle years ago, so I can attest that it is perfectly safe to use engine braking as often as you want. Now if only I can install an exhaust brake, it would be better!