I would say the very first thing to check it that the compressor is putting out sufficient pressure. Just pull off the compressor discharge (Blue) line and with the compressor running see if you can block it with your finger. I know from experience if the piston seal has burnt out you can block the air flow with your finger. If you can't see if you can somehow get a gauge on the line and check the pressure.
04 L322 Vogue V8 - Work truck
07 Freelander 2 TD4 SE - The wifes
74 Leyland P76 Targa Florio - Aspen Green
91 Kawasaki GPZ900R
Previous LRs = 78IIa series - 81, 93, 95 RRC - D2V8
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