This makes a lot of assumptions about how far into the wilderness they were, time of day, accessibility of the roads, cell phone signal, and so on. To just hand wave and call it "common sense" is silly without the rest of the context.
And for me, 100 times out of 100 I'm taking the capable guy who can fix the brakes on a trip like this over someone who's first and (likely) only instinct is to call a tow truck.