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Question:

When driving on a long downhill slope, you should brake by:

A Downshifting and then using the brakes.
Explaination

When approaching a long downgrade, you should shift into a lower gear then use proper braking techniques. Using the brakes alone could cause them to overheat and fail. The braking power of the engine, which is maximized by being in a lower gear, will be the principal way of controlling your speed on a downgrade.