Unknown Connector?

[JesusTheAgnostic]

Hello guys the other day I found an electrical connection tucked behind the battery that I have never seen before. It's near the throttle body on the 1.4t

The last picture is of a connector that's near it but doesn't seem to fit.

Anybody know where it's supposed to go? Or what it's for. It's never been connected as far as I can tell and it doesn't seem to affect the car.

 

[Maddmatts]

Mine's connected to the connector on the brake booster you've shown in the 4th pic.

 

[bluejay]

Abs?

 

[JesusTheAgnostic]

I tried to connect it to that thing but it didn't seem to want to fit. It feels like it would fit like the electrical connectors on the injectors do but it doesn't. I don't think it's for the ABS because mine seems to be working.

 

[Maddmatts]

Definitely not ABS related. It's some kind of device to keep positive pressure from the turbo from preventing you from using the brakes. Brake boosters need vacuum from the intake manifold to increase braking force.

The steel wire that's bridged across the top of the connector might need to be pushed down to spread the loops on the sides.

 

[Flyer]

Its actually a vacuum switch. If there's no vacuum in the brake booster it will activate the vacuum pump. If you follow the hose from the brake booster, there is a T that goes down to the vacuum pump and then going back towards the manifold it goes though a check valve and then the manifold.

 

[JesusTheAgnostic]

Okay so the explanation you guys provided actually confused me more. What does it do again?

 

[Maddmatts]

The simplest answer I can think of is that it ensures you continue to get assisted braking force in any event where the engine is no longer producing vacuum.

 

[Natesriv]

you've plugged it back in haven't you?

 

[Stew]

Looking at how dusty the connector on the brake booster is, it doesn't appear to have been plugged into that for a while or maybe ever?

 

[Natesriv]

plug it in!

 

[JesusTheAgnostic]

Looking at how dusty the connector on the brake booster is, it doesn't appear to have been plugged into that for a while or maybe ever?

That's what I'm saying! But then again my engine bay is always coated in dirt. I have no clue as to why.

 

[JesusTheAgnostic]

plug it in!

Alright I'll plug it in!

 

[JesusTheAgnostic]

Alright so I plugged it in. Originally I tried to plug it back in but couldn't really. I had to press down the metal clip and then it stayed stuck like that so I unplugged it. But right now I plugged it in and tried to wiggle it off and the clip moved to the original position as it would be expected to do. I don't notice anything different. If anything maybe the brakes don't feel wobbly. But I've only driven it five minutes so I shouldn't make any statements.

 

[MyLonewolf25]

Alright so I plugged it in. Originally I tried to plug it back in but couldn't really. I had to press down the metal clip and then it stayed stuck like that so I unplugged it. But right now I plugged it in and tried to wiggle it off and the clip moved to the original position as it would be expected to do. I don't notice anything different. If anything maybe the brakes don't feel wobbly. But I've only driven it five minutes so I shouldn't make any statements.

It would only make a difference under full throttle or boost when there's no vacuum

Safety feature so you can stop incase you get stuck on throttle


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[JesusTheAgnostic]

o: What do you mean? It's meant to help stop in case the throttle is stuck open?

 

[MyLonewolf25]

o: What do you mean? It's meant to help stop in case the throttle is stuck open?

Basically
Yea
Otherwise no vacuum assist at all
And if you're under no engine vacuum or boost
Or very little at all
Good luck trying to stop
Doesn't matter if you're in natural or not
No vacuum
No break boost without it because it won't switch to the vacuum pump
Can you stop
Yea but no where near as well


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[JesusTheAgnostic]

Yay safety!