On disc brakes, the caliper piston seals retract the piston when you let off the pedal. You're right to check the fluid first, and if it's low, and there are no visible leaks, it may be the pads, and/or the rotors are worn down. When you apply the brakes, the piston has to travel that much farther to push the pads onto the rotor.
When you check the brake fluid, the rear section of the reservoir is for the front brakes, and the front section is for the rear brakes.
What I look for in your case, in order would be:
1) Low brake fluid in master cylinder.
2) Visible fluid leak around the calipers, hoses, and steel lines.
3) Worn pads and rotors.
4) Air in the system, bleed all calipers.
5) Brake hoses to the calipers may be soft, and swelling slightly under pedal pressure.
6) Master cylinder leaking into the vacuum booster.
Maybe these might help you find the reason for your low pedal/first push.
Let us know what you find out, so it may help someone else that has the same question.
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