breaks really spongy

i just started driving the car yesterday and now the breaks are acting funny. they feel spongy and today they seem to really suck if i push them to hard. what could this be? help asap

Have you bled the brakes in a while? Also, how far is the brake fluid level from the “fill up to” line? If it’s almost empty, air might have gotten into the system.

if the pedal goes down to the floor slowly, you probably need a master cylinder. quite common on the DA’z.

how much do the master cylinder cost?

Sounds like master cylinder to me, Advance Auto, sells them for 45