Keanu Reeves seen riding a horse on location for John Wick 3 in Brooklyn

In the third chapter in the John Wick film franchise, “Parabellum,” out Friday, the resourceful title hitman (Keanu Reeves) steals a horse and gallops down 86th Street and 19th Avenue in Bensonhurst beneath the elevated D train tracks, all while clutching a gun. Adding to his stress, Wick is pursued by two men on motorcycles.

The logistically complex sequence was dreamed up by Chad Stahelski, the film’s director, and was actually filmed at that real Brooklyn intersection. Thankfully, Stahelski and his team discovered their star is an equestrian.

“We got lucky because we knew Keanu could ride a horse already,” stunt coordinator Jonathan “JoJo” Eusebio tells The Post from Los Angeles. “That’s a big plus.”

Although the actor had previously saddled up on camera, it was in a much calmer fashion in 1993’s “Much Ado About Nothing.” A serene trot through the Italian countryside is nothing like the high-adrenaline, deadly urban chase scene of “Parabellum.”

To create that fight, Eusebio brought on board Tad Griffith, a veteran Hollywood horse master whose work with the animals can be seen in such films as “Seabiscuit,” “Hidalgo” and “Jumanji: Welcome to the Jungle.”

Using at least four horses, Griffith and Eusebio choreographed the scene — which also includes a sequence in a stable in which Wick uses the animals to kick his enemies — at Griffith Ranch in Agua Dulce, Calif. The scene, which lasts about five minutes, took a month of prep and Reeves visited the facility several times to practice. Still, one of the biggest challenges was the city itself.

“The horses have to deal with and be acclimated to the sounds of New York,” Eusebio says of the California-based beasts. “All the traffic noises, the train noises, and there’s a lot of light.”

In order to protect Reeves, who needed to move freely to use his weapon, the crew built a “chariot” that could be positioned on any side of the horse out of frame to catch the actor if he fell. If his horse got spooked, Reeves would have a cushion to land on.

The short scene took four days to film and was shot late at night, with all the drivers on the road being actors and stuntmen.

However, the brazenness and poor sleep habits of New York made things difficult.

“New York is alive 24/7,” Eusebio says. “For Chad and them, the hardest part of the shoot was this horse sequence.”