84SD 617. Vacuum pump replaced with a new pump from whoever the OE manufacturer is. There are approximately 8,000 miles on this vacuum pump.

Recently and intermittently, brakes get hard and car won't shut off. There are 2 small vacuum line branches in the main engine compartment and another larger one behind the false wall that goes to the door locks.

The large branch is plugged awaiting my tracking down leaks and getting the door vacuum working. I measured only 10" of vacuum at one of the smaller ports then disconnected and plugged the other small port. No change. Next up was to disconnect and plug with my thumb the line at the brake booster in case the booster was leaking.

Next was to connect another vacuum gauge to the 2nd port to confirm the 1st guage. No change, still 10" of vacuum.

The car will shutoff by connecting the mity vac to the shut off line.

Are there any other leak sources or one way valves that could be leaking? If not, I'll look into another vacuum pump or rebuilding this one.

Ports that are plugged:
2 small lines in the engine compartment
larger port going to door locks
end that goes to the brake booster.

Is there anything else? Shouldn't vac be 18" or so?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.