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Old 10-06-2013, 10:28 AM   #1
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Rolls back when parked on hill?!? HELP!

My 2012 JK Sport manual transmission rolls backward when parked on steep enough incline. Anyone know why this would be? I plan to take it to the dealership under warranty but want to be "in the know" before I get there, so not to be taken advantage of.

My driveway is a hill that can park two vehicles at the top, side-by-side on a flatter surface, and two more at the bottom, side-by-side on an incline. When I came home the other day, my husband was in his spot but our trailer was in mine. So I had to park on the bottom of our driveway on an incline. I put it in first gear to park AND pulled the E-brake (just for added security), but when I turned the Jeep off and took my foot off the brake, it rolled all the way back into the road. I've tried this again to make sure it wasn't a fluke, but it did it again?

Side notes:
I've asked the dealership to adjust the e-brake in the past and my receipt reads, "no adjustment needed".

I've turned off the hill-start assist function bc I feel it shifts smoother through all the gears with it off AND reverse works better with it off. I've yet to try the hill park scenario with the hill-start assist turned back on, but my money is on it not rolling back like it did with it off. But my question is, shouldn't it not roll back EVER, if parked in first gear?

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Old 10-06-2013, 11:48 AM   #2
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Mine does the same and from what I read is normal.

The rear brakes are a pain in the ass and have to be adjusted manual (see sticky in jk area)

I carry a $7 harbor freight tire chuck with me if stuck parked on a incline.

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Old 10-06-2013, 12:02 PM   #3
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Hill start assist has no impact on parking behavior; it only holds the brakes for a second or two for people who don't know how to work a clutch properly... Jeeps have had notoriously bad e-brakes throughout history, and many of us don't even attempt to use them, but there is no reason why the transmission/engine shouldn't be able to hold the Jeep on a hill when left in gear with the engine off. What axle ratio and tire size do you have? I suppose it may be possible for a steep enough hill (with big enough tires, and numerically low enough gearing) to overcome engine compression and turn the whole drivetrain, but i've never seen it happen.
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Old 10-06-2013, 12:05 PM   #4
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4:10's and 35's here. Honesty ... It's not the first time someone posted about "creeping" with the parking brake on.
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Old 10-06-2013, 12:17 PM   #5
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The only thing you can do is pull the parking brake harder. Test it by pulling hard enough to hold it in neutral while sitting in the car. It's not a rear brake adjustment issue, it's how hard you pull the brake lever, and you have to pull hard.

The engine compression won't hold it on any hill. Only the e-brake. This is one advantage of the auto with a Park setting.

As Kjeeper suggested, a parking chock might help, but it's a pain to have to do.
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Old 10-06-2013, 05:03 PM   #6
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The engine compression won't hold it on any hill. Only the e-brake.
Is that a new issue with the 3.8 and/or 3.6? My e-brake can't hold against a stiff breeze, but the 4.0L boat anchor will keep it stuck to the side of a mountain if i shut it off in gear.
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Old 10-06-2013, 08:06 PM   #7
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I have the same problem with my 09 I just bought yesterday.
Only thing I can do to keep it from Rollin is to leave the manual trans in first gear when parking on my inclined driveway.
Will this hurt the vehicle if I keep doing this?
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Old 10-06-2013, 09:16 PM   #8
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Mine won't even hold when I leave it in gear!!!
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Old 10-06-2013, 11:39 PM   #9
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Leaving it in gear to hold on a hill is asking for trouble. It will work it's way past a compression stroke and begin moving down hill. The ONLY way to hold it is with the e-brake.

But it won't hurt the engine or drivetrain to do it, just the fender as it hits something later.
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Old 10-06-2013, 11:42 PM   #10
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Is that a new issue with the 3.8 and/or 3.6? My e-brake can't hold against a stiff breeze, but the 4.0L boat anchor will keep it stuck to the side of a mountain if i shut it off in gear.
The e-brake will hold it if you pull hard enough. I just don't like that it's all we have. Compression is not park or locked. If you really want to hold it by putting it in gear, shift to 4 Low and put it in first.
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Old 10-06-2013, 11:59 PM   #11
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Mine won't even hold when I leave it in gear!!!
What gear are you leaving it in? I leave mine in 1st and have not used the brake on pretty steep inclines and have been okay. Reverse has always been known to have the issue you are talking about, on many vehicles. This was drilled into my head when I was learning to drive.
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Old 10-07-2013, 02:16 AM   #12
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What gear are you leaving it in? I leave mine in 1st and have not used the brake on pretty steep inclines and have been okay. Reverse has always been known to have the issue you are talking about, on many vehicles. This was drilled into my head when I was learning to drive.

Leaving your Jeep on a "pretty steep" hill without setting the brake is begging for a runaway. Why would you not set the brake? Get serious. The Pentastar is a small engine with low internal friction and is not a parking brake. Sheesh.
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Old 10-07-2013, 07:23 AM   #13
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What gear are you leaving it in? I leave mine in 1st and have not used the brake on pretty steep inclines and have been okay. Reverse has always been known to have the issue you are talking about, on many vehicles. This was drilled into my head when I was learning to drive.
Traditionally I park it in neutral with the e-brake. I began this thread began because if I have to park at the bottom of my driveway, where it's steeper, the e-brake won't hold it in park. I've asked the dealership to adjust the e-brake bc it's so loose and I can pull it ALL THE WAY up. They've replied that it doesn't need to be adjusted. So when I parked at the bottom of my driveway the other day, knowing that my e-brake isn't great, I tried turning it off in first gear (& pulled e-brake) out of habit. And it STILL rolled backward. I plan to go back to the dealership regarding the e-brake, but was really wondering what could be fixed about it rolling back when parked in first gear. Is something wrong for it to do that or is there nothing for them to fix? I didn't think it should roll if in gear, was really my question. The hill is nothing crazy steep, maybe 30 degrees???


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Old 10-07-2013, 08:00 AM   #14
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I have pulled my e-brake handle all the way up and left the 3.8L in first gear. This seems to do the trick, but the creaking noises kind of worry me.
I experimented by using the e-brake only and it does not hold at all. Even tried it on a soft incline. The Jeep just rolls backward. Seems to barely function at all.
Was just wondering of leaving in first along with engaging the barely functional e- brake would cause any long term issues on the tranny.
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Old 10-07-2013, 09:04 AM   #15
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4:10's and 35's here. Honesty ... It's not the first time someone posted about "creeping" with the parking brake on.
^This...
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Old 10-07-2013, 09:12 AM   #16
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Turn the wheels hard to either the left or right, shut the engine, set a the parking brake, and leave the transmission in first. Make sure when you set the parking brake your foot is firmly on the brake. See if that helps any.

Standard transmissions can creep or roll if the brake can't hold the weight of the vehicle. It will roll a lot faster if you park it in Neutral and the brake can't hold it. You can also make sure the parking brake is properly adjusted.
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Old 10-07-2013, 04:20 PM   #17
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My only suggestion is to back it onto the driveway and try the same setup for parking your Jeep. Seems that used to help when I had to park on an incline with a stick.
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Old 10-07-2013, 08:09 PM   #18
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My only suggestion is to back it onto the driveway and try the same setup for parking your Jeep. Seems that used to help when I had to park on an incline with a stick.
Never thought of trying that. I back in tomorrow and see if it rolls forward. Thanks!
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Old 10-07-2013, 10:18 PM   #19
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We had a car ( not a jeep ) at work go for a drive by itself. It was left in reverse gear with no e brake on. Car rolled forward across the car park, over the curb at the edge, then down a small hill onto the main road. Wheels turned when it went down the hill and it ended up around 100 yards down the road against the side of the tunnel that it entered. Just missed a couple of other cars traveling along the road. The bullbar on the front saved alot of the damage to the car. Only a small dent left. But because it was left in reverse and rolled forward, the transmission did not like it and is now stuffed.

It was funny for us to watch on the security camera's. They replayed it for us all. Bloody lucky it did not hit any other cars and hurt someone.

Point is, be careful which way your jeep will roll and which gear you leave it in. Pull like hell on that e brake lever and make sure it won't roll away on you before you get out. If the dealer won't adjust you e brake, do it yourself. Park on the hill on an angle with your wheel resting against a large rock or something you can place on the side of your driveway. Better than having you jeep stuffed from going for a drive by itself.
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Old 10-08-2013, 12:21 AM   #20
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Just pull it up as hard as you can ! Don't ever leave it in neutral when parked . I can pull be parking brake up and put it in neutral just to make sure it won't roll and it doesn't , but then put it in first for added security . Are you a small woma n ? Are you not that strong ?Is there some one else that can pull it up hard to make sure there is no problem ?I know my wife sets her parking brake with such a limp wrist , she might as well not use it !
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Old 10-08-2013, 07:41 AM   #21
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That was funny to read. You forget people don't know what you look like in this web world. So if you knew me, you'd laugh at those questions too )
I'm not petite. I'm athletic build, 5'8"! If anything, I'm more worried about breaking the e-brake from being too rough than I am worried about not pulling it hard enough. Haha
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Old 10-08-2013, 08:49 AM   #22
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If possible park on a hill facing down, the e-brake seems to hold better foward than backwards. Put in in first gear also.
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Old 10-08-2013, 07:13 PM   #23
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Well , I think we need pics. !
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Old 10-09-2013, 02:04 PM   #24
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My 09 manual did this to me a few weeks ago. I parked in a friends driveway that was pretty steep, pulled the e-brake all the way up and left it in gear. Next thing I know it was creeping down the driveway. Thank god I was still in it... I just solved it by parking on the street. If you find any answers please post them. I would be interested in finding out why this happens.
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Old 10-09-2013, 03:47 PM   #25
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My 07 JKU does this when I would go visit my mom and park in her drive way. I pulled on the e-brake hard enough that it busted and had to replace the part in the center console. I even tried parking in 4Lo thinking that might help. Took it to the dealer and they gave me the couldn't replicate the problem excuse. I think the problem is just b/c the 3.8 has such crappy compression. Any decent hill will cause the engine to turn parking in facing forward or backing in.
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Old 10-09-2013, 09:27 PM   #26
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Well , I think we need pics. !
Nice try ;-)
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Old 10-10-2013, 09:22 AM   #27
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My only suggestion is to back it onto the driveway and try the same setup for parking your Jeep. Seems that used to help when I had to park on an incline with a stick.
So Jeep Dreamer did you try this yet?
Did it work for you or???
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Old 10-10-2013, 08:21 PM   #28
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So Jeep Dreamer did you try this yet? Did it work for you or???
I had tried it and it works.
Back it up on the inclined driveway, pulled up the partial/barely working parking brake and put her in first gear.
Been holding well for the past three days.
Going to the dealer next week to have them adjust those star shaped spindles behind the rubber grommet on the brake assembly.
Hope that tightens it up more.
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Old 10-10-2013, 08:24 PM   #29
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My 2012 JK Sport manual transmission rolls backward when parked on steep enough incline. Anyone know why this would be? I plan to take it to the dealership under warranty but want to be "in the know" before I get there, so not to be taken advantage of. My driveway is a hill that can park two vehicles at the top, side-by-side on a flatter surface, and two more at the bottom, side-by-side on an incline. When I came home the other day, my husband was in his spot but our trailer was in mine. So I had to park on the bottom of our driveway on an incline. I put it in first gear to park AND pulled the E-brake (just for added security), but when I turned the Jeep off and took my foot off the brake, it rolled all the way back into the road. I've tried this again to make sure it wasn't a fluke, but it did it again? Side notes: I've asked the dealership to adjust the e-brake in the past and my receipt reads, "no adjustment needed". I've turned off the hill-start assist function bc I feel it shifts smoother through all the gears with it off AND reverse works better with it off. I've yet to try the hill park scenario with the hill-start assist turned back on, but my money is on it not rolling back like it did with it off. But my question is, shouldn't it not roll back EVER, if parked in first gear?
Did you let off the clutch before letting off the brake? Sometimes I forget to do this and will roll until I let off the clutch.
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Old 10-11-2013, 05:52 AM   #30
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Like demar said try turning the wheels, parking in 1st, and setting the parking brake while your foot is on the brake pedal. Here in CA. we get a ticket for not turning the wheels if we're parked on a hill. Ask me how I learned that law coming from NY.

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