I have had the same randomly occur, you have to really press the brake pedal and it feels really solid. First year of ownership it never happened, then this year it has done it on 5 occasions. The car has just had the 2nd service and I mentioned this problem, after running diagnostics they couldn't find any fault. I don't think it is 'perfectly normal' as it doesn't get mentioned in any other posts I have read.
There may be more response if you post in the General section further down the page, this is really for 'sales' and 'wants.'
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Volvo V90 D4 CC Pro : Osmium Grey : P*
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