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Old 05-02-2013, 01:02 PM   #1
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Systems of issues w/ vaccuum pump booster thingy

EDIT: Meant "Symptoms of issues...."

Some/most of you with 2012s (and maybe 2013s ?) are familiar w/ the vacuum pump that sits on the frame rail just behind the front bumper. It's poor location requires that it be moved for some winch/bumper installs.

I had originally moved mine to under the hood as that was the only kit available at the time. I've recently used a different kit to move it to below the front sway bar, thus freeing up room for the SPOD.

So I was wondering, if it had a loose connection or something and the pump failed, what would be the symptoms? Engine dies? Dash lights up? Radio starts blaring Highway to Hell and shortly after the Jeep explodes?

I'll just feel better if I know the symptoms when/if they arise that I'll know "Oh, I've got something wrong w/ the vacuum pump".

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Old 05-02-2013, 01:24 PM   #2
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Well the usuall stuff that operates with vacuum would be the power brakes and the heater vent controls. Good question though, i'm sure someone has bashed theirs on a rock and will chime in here.

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Old 05-02-2013, 03:24 PM   #3
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When I installed my bumper, I had to relocate it due to the clearance issue.

I noticed about 6 months ago that the vac line had worked its way loose so I reconnected it & zip tied it into place.

I gained almost 1 mpg but there weren't any noticeable side effects besides that.
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Old 05-02-2013, 03:27 PM   #4
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Quote:
Originally Posted by enjerhoo View Post
When I installed my bumper, I had to relocate it due to the clearance issue.

I noticed about 6 months ago that the vac line had worked its way loose so I reconnected it & zip tied it into place.

I gained almost 1 mpg but there weren't any noticeable side effects besides that.
good to know. I've put a call into the dealership, but I don't expect a call back. Will drive over there this weekend and get an answer.
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Old 05-02-2013, 03:35 PM   #5
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In my experience, (XJ not Wrangler), the pressure required on the brake pedal increases, enough to notice, when there's a problem.

I relocated mine on the XJ and taped up the hose connection.

Wouldn't the newer JKs throw a code?
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Old 05-02-2013, 03:40 PM   #6
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Quote:
Originally Posted by live_slow View Post

Wouldn't the newer JKs throw a code?
good question, I guess I could disconnect it and see what alerts, if any, I get on the dash.

My questions are kind of 2-pronged:
1) what alert, if any, will show on the dash?
2) what affects does this have on drivability (i.e. it goes out while I'm going 70 on the interstate, trying to brake at stop sign, etc)
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Old 05-02-2013, 03:42 PM   #7
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^^
Does your XJ have ABS? That might be the difference - vacuum operated brake booster vs. ABS controller?

You would think it would throw a code. That would have saved me +/-5 months of -1 mpg loss FWIW. I was surprised mine did not since the line was completely off.
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Old 05-02-2013, 04:00 PM   #8
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Quote:
Originally Posted by enjerhoo View Post
^^
Does your XJ have ABS? That might be the difference - vacuum operated brake booster vs. ABS controller?

You would think it would throw a code. That would have saved me +/-5 months of -1 mpg loss FWIW. I was surprised mine did not since the line was completely off.
Well yeah, it had ABS (sold it a while back), but that was 2001. Anyway, mine wasn't off for long, so I never had a serious problem, like freeway panic stops, and when I did realize it, I moved it and taped it up. I don't remember any ABS light on either.

So you make a good point as to how you would know if it was off for a while in a modern JK. Now I have to go try to find out what all of it's functions are on the JK :-P
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Old 05-02-2013, 05:43 PM   #9
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Well see what the dealer says Saturday. May be tomorrow if I get time b
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Old 05-05-2013, 07:07 PM   #10
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Confirmed with dealer this is for brake assist. If it goes out you may notice it is slightly harder to break.

I discod it today and started the vehicle. No errors on the dash. So I guess that's answered now.
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Old 05-05-2013, 07:16 PM   #11
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do you have an auto? i moved mine 2 days ago and i notice when pressing on the brake in park it hear a pronounced click from the center console. sounds like a relay or something. i don't remember this noise before.
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Old 05-05-2013, 07:17 PM   #12
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Quote:
Originally Posted by FranksJK View Post
do you have an auto? i moved mine 2 days ago and i notice when pressing on the brake in park it hear a pronounced click from the center console. sounds like a relay or something. i don't remember this noise before.
Yeah. Auto.

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