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Originally Posted by origamitect
IP Shutoff works fine. Pressure is less than normal when pressing on brake pedal. Door locks don't work, but are disconnected from the system. Fluid level does not appear to have gone down. Put in new master cylinder last year.
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Less pressure when pressing the pedal sounds more like a hydraulic problem, not vacuum. Check brake pads and discs for wear, check all calipers and brake lines for leaks (rust!) and check your MC. Bleed the system, maybe it's only air from extensive use. (have you been driving in the mountains?) In this case I would also change the fluid.
BTW there is a nice thread somewhere in this forum about bleeding the brake hydraulic system by connecting it to the clutch hydraulic system at the clutch slave cylinder. 100% mess free workplace and 100% air free brake AND clutch hydraulics.