What is this doodad?

[seven30]

As Shadows Papa described, it is the vacuum pump for the brake booster. Engines don't make as much vacuum as they used to - especially once carburetors with throttle bodies went away. Under certain conditions the vacuum isn't sufficient for a sustained brake pedal response so the electric vacuum pump keeps the vacuum strong in the brake booster..

I tow our Jeeps behind a diesel pusher motorhome and have an M&G pneumatic braking system that applies the Jeep's brakes proportionate to the coach's air brakes. I had to cut into the harness for that pump so that it would operate whenever the Jeep was plugged into the hot wire on the coach's trailer lights harness otherwise the pneumatic actuator wouldn't have the power to depress the Jeep's brake pedal without vacuum. That's common to most Mopar products. Ford and GM require an add-on vacuum pump for flat-towing behind a motorhome.

I suspect the primary reason for it is to supplement vacuum when ESS is active. Been super cool though if it was purely hydraulic, tapped into the power steering pump.

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[REDBEAST]

What is this device located under alternator? Vacuum pump??

It's the automatic fart arrester.

 

[RVcruzer]

I suspect the primary reason for it is to supplement vacuum when ESS is active. Been super cool though if it was purely hydraulic, tapped into the power steering pump.

Except the power steering pump doesn't turn when the engine isn't running.

 

[seven30]

Except the power steering pump doesn't turn when the engine isn't running.

Our pump is electric Fancy huh.

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