Following on from this thread - http://www.vectra-c.com/forum/showthread.php?t=107610
The garage the guy took the brakes too apparently say the brakes don't hold pressure.
This is the message from the guy who bought them...
hi mate thanks for getting back to me, its a independant garage near me, he does all my work, he bleeded the system many times, he has told me that the calipers arent holding the pressure, when you apply the brake there is nothing then press it a a 2nd time there is a bit, then the 3rd time there is a bit more, but if you hold it down on the 3rd time all the pressure goes and you cant stop the car, only the rear pads work.
I then went to penfolds vauxhall garage and they told me that my car CAN take the bigger brakes, and they said my only choice was to get the brakes stripped down to see whats wrong. Im also sure the mechanic i took them to knows what he is doing cause he put my old brakes on and they work fine, anything else you can think of?