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Certainly points to a lack of pressure in the system. It could me either the master or slave cylinder, but there would (normally) be a loss in braking efficiency as well. Are there any leaks in the system? How old is the fluid? Your cheapest option to try first would be to renew the fluid (if its more than a couple of years old), and bleed the system completely - see how that changes the situation, and move on to the servo side of things. I would also check if there is a spring on the pedal box, and ensure that it has not stretched so that it does not return the pedal upon release.
Simple things to check and eliminate first.
Hope that helps,
This job should never be complete - the day I think I've done it all, is the day I resign.
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2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater