Air sound when push on breaks,pedal to floor - 1985 Oldsmobile Delta 88

I am not a mazda guy but it sounds like the pressure plate is bad. Have you check the clutch linkage to be sure something did not slip or break. If so I would be looking at the clutch pressure plate.

you have a leaky brake booster from the sounds of it

sounds like you got air in your brake lines from where you changed your pads thier should be a bleeder valve on your brakes get a friend to hold the brake pedal to the floor while you take a wrench and break the valve open when the pedal hits the floor close the valve just continue doing that until pure brake fluid comes out without air bubbles start at the master cylinder under the hood and don't stop until you have done all four corners if that doesn't fix it you might need a brake booster

If the pedal goes all the way to the floor you have air in your lines somewhere. If the pedal is soft and spongy then there is air in the lines. Start checking around the inside of your tires, and up near your Brake Booster and Master Cylinder

Check the vacuum line on the power brake booster, the diaphram may be pushing the air down the rod, the break booster may be defective all together if the vacuum line is intact.

To bleed the brakes you need someone to pump the brakes and someone to watch the air valve on the back of the brakes until the air is out of the line. Once the air valve on the back of the brake line starts to flow brake fluid clearly then the air will be out. Recap the air valve and you should be ok.

YOU HAVE A BAD MASTER CYLINDER
HAVE IT REPLACED AHD YOU PROBLEM WILL GO AWAY

Two persons are required: one to bleed and other to press brake pedal.
Remove wheel and hub of the side you want to bleed. You will find the bleed nut there. Open it a little until some oil flows out. Ask the other person to press brake pedal with steady pushing and withdrawing until he feels its tight while you slowly tighten the nut. Adjust tightness of pedal by trial. Don't forge to refill the brake fluid after bleeding all the brakes.

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just have the linkage checked , busted cable sounds like, then look for reasons why as well, ex. why did it break, worn , frayed, something froze up on throttle plate

there is a big rober hose by the power booster start the car up and then turn the car off then unplug the hose if you hear like air the the booster is ok but if not then most likelly the powwer booster is not good