Help brake pedal lost pressure

Sounds like you blew a brake line. That makes the car unusable as you will keep pumping fluid out every time you push the brake pedal, and it will leak out just setting still. This is a now type repair. Have it towed to a shop and get the broken lines/seals/parts replaced.

No! Steve W. Is exactly right, but if he was standing next to you, he would either be rolling his eyes or smacking your head. Brake fluid never just leaks out, you add a little, and the leak magically stops. The glaring potential clue you may have overlooked is the brake pedal sinks slowly to the floor when you hold steady pressure on the pedal. The reason I say "potential", is if the inside of a tire is wet, a wheel cylinder is leaking and that type of leak can momentarily stop when the brake pedal is pressed. You might not have a slowly-sinking brake pedal, but the fluid will seep out when the brakes are not applied. The instant the fluid level gets low enough for air to be sucked in, the brake pedal will go to the floor and you might have half of your brakes. Pity the poor kid who runs into the street after his ball, and that is the time you do not have brakes. Try explaining to the jury that you knew there was a problem with your brakes, but you chose to drive anyway.

I do not normally stick my nose in other people's conversations, but the 1993 Chrysler, then the brake issue, caught my eye. I have a 1993 Dodge Dynasty with 4,900 miles, and a pile of Chrysler minivans, and I am a brake system specialist. Driving with sub-standard brakes is something that should only be left to me, because I am not as smart as some people think I am. Two months ago I blew out a rusted steel brake line just as I was approaching a stopped car waiting at stop light. I was going plenty fast, but no worse than many other drivers. Somehow I managed to stuff my van between that car and a steel light pole, perfectly centered between them with just enough room to open the door. Pile driving it into a snowbank is what stopped me.

My reason for sharing that wondrous story is to emphasize the importance of knowing your car is safe. You usually will not be involving an insurance company or ambulance if your engine will not start or your dome light does not work. Brakes is the one system I do not want anyone to marginalize or ignore, especially if you are right behind me. I am happy you are having the problem addressed. As far as brake problems go, a leaking wheel cylinder is very minor, and easy to fix.