Brake pedal sinks?

Thanks. Never heard of this vise grip hack. You mean use the vise grips on 3 of the 4 wheels and kind of close the hoses? I will check the calipers first for sure. Also, this has rear drums, is it possible that if brakes are worn in the rear it can cause that? Even though the fronts are good?

So lifted the car on all 4. No fluid leaks around any of the wheels or lines. Removed the hose from intake to booster. Cleaned it with brake cleaner to clean any debris from the check valve. Brake pedal gets tight when pumping it while off, the once car started it sinks. Also, when I removed the hose from the booster it gave a good vacuum sound. Placed parking brake on and neither rear wheel move so that's good. Will see about bleeding it first to see if that makes a difference, but no matter how much air there is no way it can lead for it to be this bad as to extremely difficult to stop, whoever had it was driving it for sure. So, if bleeding is okay, master must be bad.

More findings. So after I lifted the car I put it in gear to see what happens and the left wheel was wobbling so bad I thought maybe the wheel bearing is bad. Removed it and it looks like someone just installed new rotors and pads. So I removed the caliper and pressed the brakes and it didnt move, not sure if its a caliper issue or if they opened the lines when they did the work. While the wheel is turning when in drive and while I press the brakes the wheels keep moving have zero brakes.

Check this out please.

I will. So, pinch the lines lightly with 3 if them and see.

Pedal still drops no matter what, bled all 4, sometimes with brake pressed the front left and rear right both can move freely, not until you pump the pedal few times when all 4 do hold.

Changed it but it's still mushy. I out the car in drive and the driver aide wheel moves then I can only stop it if I pump the brake pedal.

No didn't try via scanner, I will try it. Oh, shoot I only did the vise grip on one I forgot, let me try it on all 4.

Did you mean to yse 3 grips on 3 wheels or 3 vise grips on one wheel hose?

Oh, I understand now. And then remove the vise grip once at a time to see which wheel has the issue.

Can't be frozen if the wheels are moving, correct? I put in gear and driver side moves and if I hold it passenger does. Also, weird thing I have seen on several cars before, even if you leave the gear in neutral after you put it in drive the wheel keeps moving.

So, I got me a set of these in the picture instead of the vise grips. Once I blocked all 4 pedal gotten better, removed one at a time and when I did it to one of the rears all the pressure went there and I saw it leaking, removed the drum and holy crap lol. That doesn't look good. Leaking and nothing left on the shoes.