17 JKU Rubicon brake light on dash - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 13 Old 01-13-2019, 03:39 PM Thread Starter
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17 JKU Rubicon brake light on dash

Hey guys been a while since I have been up here i got a 17 JKU. For the first time today I was pulling into the gas station and my brake pedal got hard like abs kicked in and my brake light lit up on the dash. Ever since then it’s been Intermittent and when my pedal gets hard you can feel abs trying to over ride the pedal, then the light comes back on for a few min. Have y’all seen this it’s pissing me off. I have heard things about the battery with these. It’s also stuttering almost like a dead battery but cranks perfectly fine. 🤦‍♂️🤦‍ ♂️🤷‍♂&#xfe0 f; Any help would be appreciated.
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post #2 of 13 Old 01-13-2019, 08:13 PM
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Ah this started to make sense when I read it again cuz I think the part about your jk ďstutteringĒ is the clue. Does it stutter or stall the most when you push in the brakes? Sounds like you have a leak causing the system to not be vacuum tight, you have a hose running from the throttle body to the brake booster and teeíd off that line is another hose going to the vacuum pump (located behind your front bumper). I would check those hose connections especially if youíve done a vacuum pump relocation say for a new front bumper.
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post #3 of 13 Old 01-13-2019, 08:21 PM Thread Starter
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Yea sorry Iím horrible at making stuff make sense lol. The stuttering isnít really worrying me the rig has a ripp supercharger. I need to dig into that and, find my vacuum/boost leak. What is bugging me is when I hit the break on dry pavement my pedal gets hard and I can feel abs kicking in. Almost like Iím sliding but Iím not. A leak in the system wouldnít cause the issue with the abs would it? When this happens my brake light comes on like the e brake is pulled and the hard the I press the pedal the harder abs tries to counteract it.


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post #4 of 13 Old 01-13-2019, 08:51 PM
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Hmm I donít know if the ABS system is monitoring vacuum level, wheel sensors for sure...but it wouldnít be the craziest thing for a low vacuum to trip the ABS along with the Brake light. Had to remove the intake manifold as part of the supercharger install right? So that would be another place for a possible leak.
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post #5 of 13 Old 01-13-2019, 08:57 PM Thread Starter
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The supercharger has been up there for a while now. I took the intake off last night just to double check all the seals and I spect the plugs to make sure they were no fowled out. The plenum gaskets looked to be in good shape and plugs looked excellent. Funny part is last night I had no brake issues, they started for the first time this morning.


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post #6 of 13 Old 01-13-2019, 09:00 PM
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I guess all I can really say is sure seems like low vacuum caused by a leak or even a bad brake booster can cause both the hard brake pedal (no vacuum assist) and engine stuttering (improper fuel/air mixture).
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post #7 of 13 Old 01-13-2019, 09:02 PM Thread Starter
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Ok well I will definitely look into it again I very well could have missed something. Thank you for your suggestions. I will post what I find tomorrow night.


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post #8 of 13 Old 01-13-2019, 10:11 PM
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Quote:
Originally Posted by CrazyJK View Post
Ok well I will definitely look into it again I very well could have missed something. Thank you for your suggestions. I will post what I find tomorrow night.


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They may be bad suggestions lol the supercharger is adding an element Iím not familiar with, and not knowing where or how your vacuum hose would be setup to negate the boost supplied by the supercharger to still let a vacuum device like the brake assist work...
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post #9 of 13 Old 01-13-2019, 10:38 PM
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Ok so did a little search and found the RIPP install manual for a 2012-2014 JK (didnít see one on newer models so donít know how much changed); shows a PCV or basically a check valve installed on the vacuum line, that makes sense. So that would be another component to check but if at low rpm like when youíre saying the issue is occurring there shouldnít be much boost...geez now Iím kinda circling back to a leaking intake manifold or hose but at least I learned a little more on superchargers haha
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post #10 of 13 Old 01-14-2019, 05:00 AM Thread Starter
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Lol thatís what I what I was looking for as well. So me going back to my old carb days I took parts cleaner and sprayed it around all the connections. I sprayed the intake and all the boots and nothing. No change in idle if I had a leak it should have changed it would have sucked that in and, affected combustion. Iím starting to draw a blank lol.


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post #11 of 13 Old 01-14-2019, 06:23 AM Thread Starter
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So after messing with it this morning before work I feel like a complete dumba**. The booster line was barely connected when I touched it this morning it fell off.


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post #12 of 13 Old 01-14-2019, 11:01 AM
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Still a good find! So brake issue is resolved, how about the stuttering?

Also since you got your safety issue fixed I feel like I can derail a tiny bit:
How long/many miles have you had the RIPP SC on? Iím interested in one myself depending on how my engine checks out when Iím ready to address power for bigger tires. Overall have you been pleased with the performance? It was positive to hear when you took the intake manifold off that everything looked good, any negatives arise from running the SC?
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post #13 of 13 Old 01-14-2019, 02:38 PM Thread Starter
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The stuttering is still there a little bit but Iím going to call Ripp and get some more info.

The Jeep currently has 35k on it, the power band is awesome in it. I purchased the Jeep with the charger on it. When I pulled the plugs and looked through everything else it relatively clean except for blow by which some of it is from crappy oil the supercharger will cause som blow by. Other than that man it moves my JKUR on 35s with no problem.


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