Problem with a sold car (Volvo v70 2008)

[Ek cars 17]

Sold 1 last week a Volvo v70 2008 d5 Fsh 133k customer purchased having travelled upto Scotland from London.  Drove car away and not heard until yesterday when he informs me brake pedal has went rock solid and it struggles to stop he can also hear a hissing noise coming.  Fault was not present when sold and chap was extremely pleasant and no reason to dis believe also who would be best placed to assist in North London and rectify (Volvo indys?)  Knew it was going too good to be true, ps no warning lights illuminated and brake pedal still rock solid when engine on.

[Stalker 180]

Sounds like the vacuum pipe to the servo has a leak. Should be an easy fix for any mechanic. However inside the M25 you can expect to pay Edinburgh rates to get it fixed. 

[Mark101 536]

+ 1 on vacuum pipe/servo

[It's me 615]

and another

[metcars 397]

Yes he's probably fucked around under the bonnet and knocked something off