Hi folks

Hoping someone can save me some time and money here

The brakes in the 300e (1988) were working fine one day, get in the car the next morning and whoosh! Pedal went all the way to the floor! They still 'work' in that they stop the car with the same power - but there is no resistance in the pedal whatsoever. At lights it pushes to the floor easier than the accelerator and the last 1/3rd is loose/you can hear air rushing around somewhere.

Anyway, no leaks or air leaks to be found, fluid full, master cyl replaced about two years ago. Today - it got worse. Stopped at some lights and when I took off, the brakes stayed on! So whatever it is, it's getting worse in the two times I've driven to see what the go is.

Any help is always much appreciated!
Luke

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1971 280SE - The S Class
1974 280CE - Sterling
1988 300E - Stanley