I don't do it as a substitute for using the brakes approaching a traffic light on level ground. I don't do it to slow down from a higher speed to a lower speed. I generally do it on a steep grade to keep from increasing my speed to the point that I'd otherwise be riding the brakes.
1946 Chevy pickup, 1948 Chevy suburban, 1950 Chevy pickup, 1952 GMC pickup, 1957 Chevy pickup, 1939 Chevy pickup
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