Perhaps the brakes cut the blue car's speed by half, but they didn't change the result.
Laura cut their speed by more than half, and they pulled behind the other car.
He cut his speed to ten knots, then to five, and finally to three.
Jack cut his speed to a crawl as she pointed to a group of workers in the field.
He cut speed and dropped lower yet, into the shadow of a black peak.
He took the car down to within a few hundred feet and cut speed, entering the canyon.
While by no means impossible, running under such a handicap will cut one's speed nearly in half.
He cut the motor's speed and turned the boat for shore.
Instead of pushing ahead, however, he began to cut his own speed correspondingly.
There would have been no chance to cut their speed and flee back to Outpost, even if they had tried.