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I’ve noticed two pipes coming off the main pipe but one of them isn’t connected to anything.
That white tube needs reconnecting to the rubber braided piece, though I'm not familiar with the 2.5tdi I cant see that the vacuum system would be any/much different from a 1.9td, that white tube will be the vacuum feed for either the EGR or the air recycling in the heater matrix, as it is at the moment your vacuum system basically has a hole in it, that will be the reason the brake goes hard on a quick second push, the system can't build up vacuum quickly and sufficiently enough with air leaking into it.
 
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