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A month ago, Jordan Wyckoff was riding an electric Citi Bike to work in Brooklyn when he slammed on the brakes to avoid a minivan that swerved in the bike lane. But when he hit the brakes, the front wheel locked up, sending Mr. Wyckoff over the front of the handlebars and onto the pavement.

The same thing happened to Dominik Glodzik when he tried to brake before a stop sign in Astoria, Queens about two months ago.

William Turton flipped over the front of an electric Citi Bike while trying to brake before an intersection on Bedford Avenue in Brooklyn.

In recent months, dozens of riders have reported injuries while riding electric Citi Bikes, prompting the company on Sunday to pull all of the approximately 1,000 electric bicycles from New York City’s streets amid safety concerns about the brakes. Lyft, which owns Citi Bike, took similar precautions with its other bike-sharing services in Washington and San Francisco.