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Whether you are transporting your bike, or changing an inner tube, sometimes it is necessary to remove the wheels. In order to remove and fit wheels, you either have to deflate the tyres or release the brake calipers; otherwise you won’t be able to get the tyre past the brake pads.
With Shimano and SRAM brakes there is a lever on the brake arm with which you can release the brake. Pull up on the lever in order to release the caliper and pull it down to close again. Picture 1
With Campagnolo brakes you need to press on the silver button on the inside of the brake hood to release the caliper. In order to close the caliper again, press on the button from the other side of the hood. Picture 2
Remember to connect the brakes again before you ride. Do never ride with released brakes!