Hi, thought I would add my tuppence worth. Just found this thread after googling defect in brake vacuum pump C5. Just got a recall notice through for my C5 re this. Annoyed that it has taken so long for this to come through to me when the problem has obviously been ongoing for a number of years. My C5 tourer 2.0 (2008) started to give me problems a year ago - got the fright of my life when the brake pedal appeared to fail (hard as a rock) just metres from my front door - overshot a giveway but due to my travelling so slow wasn't a major problem but a car had to swerve around me. Immediately took it to citroen garage and they kept it for two days - as far as they were concerned nothing wrong with the brakes - claimed I must have hit a bit of black ice - basically did not believe my description. It has continued since, most mornings, especially if a cold morning but once I've deliberately pumped the brakes several times it sorts itself out. Didn't go back to garage as I felt they wouldn't believe me!!!!
Will be glad to get this sorted at last via the recall but very annoyed the garage didn't pick this up last year when I complained!
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