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Let me know the way the brakes work in a boosterless car
Usually, not very well. The master cylinder is a different size in a boosterless model, and if the booster stops working it takes a lot of pedal pressure to stop the car. You can test the effect this will have on your B210 (120Y) by temporarily disconnecting and plugging the booster hose with a spark plug or bolt.
The brakes in the 1200 have easy pedal effort due to the light weight of the vehicle. It doesn't need a booster. The B210 is 20% heavier and is about the borderline of where cars got boosters ... back then a lot of cars that were heavier did not have power brakes, so there is no real requirement. With the right size master cylinder it should work fairly well.