Maybe try bleeding the brakes first and then start the car with your foot hard on the pedal -- the pedal should drop slightly and this shows the booster is working !
Then look for leaks around wheels, callipers,hoses, pipes etc
I suspect that if you are not seeing leeks anywhere that one of the servo/boosters has failed and the fluid has leaked inside them.
Fit new seals or buy an exchange unit. -- lots of fun :-)
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