Brake Travel, I feel a bit of a dip shortly before the stop?

Hi,

If you are unable to find a new factory part or aftermarket part, the next thing to do is check a salvage yard or somewhere like Ebay for a known good used one.

I wish I had a better answer, but this is the reality of this type of problem. Also, just out of curiosity, contact a local parts store and ask if they have a power brake booster for your vehicle. If they do, see if it comes with the sensor.

Let me know.

Joe