Sorry I was a little confused, there is a cable the 'control pressure cable', I assume that is what is meant by the Bowden cable. If that is the case iluvmils is spot on as to the location. sorry for the mistake. I would adjust the vacuum modulator before the cable to adjust a flare though.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)