Not likely that the booster is an issue. The booster would not be able to overcome the brake fluid compression.
First open and inspect all brakes for leaks, adjustment, etc. Check all brake lines.
So if no leaks, did the fluid go low in the MC? If so, pad consumption would eat more than a MC reservoir of fluid, and not require MC replacement, but rebleeding and top up of fluid. If the pads are worn, and you replace them, often this will expel air back through the MC.
If you determine the MC is faulty, bench bleed the new one before install, or you will have lots of problems getting air out....
Not the booster! The master cylinder or just a lack of brake fluid. Check the fluid and try bleeding the system before looking into the master cylinder itself. Check all the wheels for leaks as well.
Three things would cause that to happen.
1. There is air in the system. Either from replacing parts or running the master cylinder to low. Bleeding the brakes will solve this problem.
2. There is a leak in the system. Rusted brake lines and if it has rear drum brakes rear wheel cylinders leaking are pretty common. A good thorough brake inspection would find either of these.
3. You have a bad master cylinder. Typically the first symptom is a dropping pedal. Which means the car and pedal will stop or feel normal but once stopped you can feel the pedal slowly drop to the floor.
All the booster does is make the pedal easier to push. If the booster where bad the normal symptom would be that the brake pedal is hard to push. They can also pull on the brake pedal and keep the brakes applied but it is not as common.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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