MTA’s boss tapped the brakes on Zohran Mamdani’s key campaign promise to provide free buses across the Big Apple — criticizing the plan as half-baked and much more expensive than proposed.

“I want to make sure that people of limited income get priority in this discussion and we’re not just giving a ton of money to people who ride the 104 on the Upper West Side,” MTA CEO Janno Lieber said on NY1 Wednesday morning.

The MTA head also said the cost the campaign has associated with the free bus programs — $700 million each year — was underestimated.

“They’re looking at fare box revenue that we got from buses last year and so on. But you know, our projection is that that bus revenue is going to start to push closer to a billion dollars a year in the next couple of years,” he said.

Lieber s

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