Quote:
Originally Posted by andrewinpopayan
Vacuum should build up really quickly, no more than a couple of seconds AND stay there for a good while when you stop the engine.
Andrew
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As a point of reference...
Mine will hold the vacuum for many days, maybe even weeks. I can go back to it after its been stood and get 2 maybe 3 presses before the stored vacuum is exhausted and the pedal goes hard.
Vacuum is only fed to the EGR and its pipe, at low engine revs and via a solenoid operated valve, controlled by the ECU.
If assistance is poor, but only at low speeds, then I might be inclined to blame it on a leak via the EGR part of the system - the solenoid, the EGR pipe, the EGR if fitted.