It is normal to have no brake pressure for the first 1-2 pumps after replacing brake pads, but I assume you are past that. You should not normally have to bleed the brakes after doing only that.
When you retracted the pistons back into the calipers to allow the new pads to be fitted, was there any leakage noted? Were the pistons out of the caliper pots far enough to let any air in? What was the brake pedal like before this job? Was it spongy or low? The air may already have been there.
Check the caliper/pad assembly to see if everything is in place OK, and if so you will have to have the system pressure bled. If the car has ABS brakes you will usually have to pressure bleed them anyway, as the old 2 person method will often not get all the air out.
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Do you have an electronic brake pressure pump for brake assist that you may want to make sure works properly. When turning ignition on, you should hear the motor run, also when you press the brake pedal.
Fig. 1: Loosen the front brake line in order to bleed the master cylinder
Fig. 2: Connect a bleed hose from the bleed valve on the front caliper to a jar of brake fluid
Fig. 3: Always follow the lettered sequence when bleeding the hydraulic brake system
Hope this helps to solve it; remember to rate this answer.
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