I have the same problem. It’s only started to happen in the last few weeks or so. I presume it’s loss of vacuum pressure from somewhere in the system, but I haven’t been able to track it down. There are plastic pipes, so I’m presuming a small crack or something.
Coincidence or not, in recent months I’ve had to replace brake hoses to the rear calliper because they started to leak very suddenly. I can’t see why loss of fluid would cause the pedal to go hard, though. Current: 2010 Range Rover L322
Vogue SE, TDV8 3.6, Bournville
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Now gone: 2002 Range Rover L322
Vogue, TD6, Giverney Green
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