That would be the vacuum switch for the brake booster. Volvo part number 31400692.
The idiots at NTB broke mine when I was taking advantage of a $35 Synthetic Oil Change deal.
You'll notice your brakes will be softer until the car is completely warmed up.
will do as soon as i have a dry moment ( its raining here in NJ)Yes, look around that area and see if the rest of the part is dangling by the wire. I believe that it's a brown connector.
That makes sense, If i can find it ill see what i can do, if not there may be another issue.It's a vacuum sensor for the electric vacuum pump located further down and very close to the transmission cover.
You may not notice any difference if it works correctly or not. It is only fitted to later (usually post 2003) models. The vacuum created by the manifold alone will be enough to operste the brakes. Later models have a small vacuum motor to even out vacuum drops upon startup and during heavy braking.
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