make sure you have your wheels straight if you're going to hit the brakes hard, otherwise you will be sideways, even from low speeds (like under 10 mph)
as for engine braking, it is helpful because it is smoother than braking, and you don't risk locking your wheels even for a split second (since you don't have abs)
for instance, say you are going down a long, mid grade hill. you could either roll down it in a low gear or stay in D and brake down it. Option A, your wheels will spin and adjust regardless of surface conditions. Option B, youre braking, and say your left side hits a dry patch of pavement, which gives those tires more braking traction, which will turn you to the left....bad news.
as for engine braking, it is helpful because it is smoother than braking, and you don't risk locking your wheels even for a split second (since you don't have abs)
for instance, say you are going down a long, mid grade hill. you could either roll down it in a low gear or stay in D and brake down it. Option A, your wheels will spin and adjust regardless of surface conditions. Option B, youre braking, and say your left side hits a dry patch of pavement, which gives those tires more braking traction, which will turn you to the left....bad news.