Push brakes to the floor before stopping..happens about 50% of the time. Cause? on 1999 Land Rover Range Rover

Sometime when I push on the brakes the pedal stops at midway...other times I have to push it almost to the floor. When the pedal stops midway the longer I have my foot on the pedal it will eventually go all the way to the floor. Cause and cure?

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1 answer
The problem was diagnosed as the master cylinder needing to be replaced! Not an inexpensive replacement! : (