Brakes are very sharp so it probably isn't the lack of vacuum. When i blanked the egr i also blanked off the pipework from the vacuum pump to the egr. I've also replaced a couple of the rubber ends around the solenoid valve that, although not split, were a bit loose. How does the solenoid valve work? It has an electrical connector which presumably progressively enables the vacuum to reach the turbo but should i be able to measure a voltage at the pins? As for the turbo, it doesn't seem to kick in until 2.5-3k revs. Thanks