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  #13  
Old 02-13-2014, 11:29 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

If the incline is such to allow the vehicle to roll in neutral due to gravity, the parking brake is required. User error.

Transmission parking pawl's are not designed to be sole items securing a vehicles position.
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  #14  
Old 02-14-2014, 10:47 AM
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Re: Holy smacks! My JGC just moved itself out of the driveway

The irony of this is that I almost always use my parking brake. Almost always because I'm obsessive. But I've never had a problem with a car just rolling out of park like that.

I'd venture to say folks who drive manual trannys are more inclined to use the parking brake. I believe most would believe "P" is good enough to hold a car except on the steepest inclines. User error or not, my bet is your 50/50 at best with those who use the parking brake with any regularity.
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Old 02-14-2014, 11:49 AM
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Re: Holy smacks! My JGC just moved itself out of the driveway

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Originally Posted by GoHerd View Post
The irony of this is that I almost always use my parking brake. Almost always because I'm obsessive. But I've never had a problem with a car just rolling out of park like that.

I'd venture to say folks who drive manual trannys are more inclined to use the parking brake. I believe most would believe "P" is good enough to hold a car except on the steepest inclines. User error or not, my bet is your 50/50 at best with those who use the parking brake with any regularity.
I posted this in both my original post and now yours... please keep me updated on your vehicle

I also have 2 young children. My vehicle has attempted vehicular manslaughter on me, I worry about my kids. I worry about what if just once i forget to hit the parking brake and then it rolls back on them. I arrived home from hunting one day with a friend of mine. I parked it in my driveway, put the car in park, and turned the car off. I opened my door and then all the sudden the door was on top of me. It ran over me as it rolled down the driveway...all while my friend was screaming like a girl in the passenger seat. But i think about what if, what if someone was walking on the sidewalk, what if a car was coming up the street and it slammed in to the passenger side of the car?

Well it has been 1 full month now. It was at the dealership for a full week. They could not replicate the issue, but they did not test it on a grade. The dealership believed that there was an issue so Jeep agreed to install a limited slip differential vs the open wheel and then offered an extended warranty. just heard back Monday that due to my car being the v6, the limited slip is not compatible. so now waiting to hear back on what my options are...
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  #16  
Old 02-14-2014, 12:00 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

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Originally Posted by Summit View Post
I also have 2 young children. My vehicle has attempted vehicular manslaughter on me, I worry about my kids. I worry about what if just once i forget to hit the parking brake and then it rolls back on them. I arrived home from hunting one day with a friend of mine. I parked it in my driveway, put the car in park, and turned the car off. I opened my door and then all the sudden the door was on top of me. It ran over me as it rolled down the driveway...all while my friend was screaming like a girl in the passenger seat. But i think about what if, what if someone was walking on the sidewalk, what if a car was coming up the street and it slammed in to the passenger side of the car?
YOU NEED TO USE THE PARKING BRAKE EVERY TIME YOU PARK

Your vehicle dod not "attempt vehicular manslaughter on you", you were negligent by not setting the parking brake when you parked...bottom line.

Every time. PARKING brake. Every time.
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  #17  
Old 02-14-2014, 12:00 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Quote:
Originally Posted by Summit View Post
I posted this in both my original post and now yours... please keep me updated on your vehicle

I also have 2 young children. My vehicle has attempted vehicular manslaughter on me, I worry about my kids. I worry about what if just once i forget to hit the parking brake and then it rolls back on them. I arrived home from hunting one day with a friend of mine. I parked it in my driveway, put the car in park, and turned the car off. I opened my door and then all the sudden the door was on top of me. It ran over me as it rolled down the driveway...all while my friend was screaming like a girl in the passenger seat. But i think about what if, what if someone was walking on the sidewalk, what if a car was coming up the street and it slammed in to the passenger side of the car?

Well it has been 1 full month now. It was at the dealership for a full week. They could not replicate the issue, but they did not test it on a grade. The dealership believed that there was an issue so Jeep agreed to install a limited slip differential vs the open wheel and then offered an extended warranty. just heard back Monday that due to my car being the v6, the limited slip is not compatible. so now waiting to hear back on what my options are...
I'd say your options are to use the Parking Brake. The Pawl is not and never was considered a safe method of holding any vehicle in position. When I was 17, I pulled into an inclined 7-11 parking lot and put my Dad's Nova in Park as always. When I came out of the store, the car had rolled down the parking lot, across the 55mph 2 lane highway and into a planter in front of a store. The owner said it was the 6th vehicle to do that and the reason he put the large concrete planter in front of his store. The pawl had simple worn out or broken in this case.

See Parking pawl - Wikipedia, the free encyclopedia for more.
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Old 02-14-2014, 12:07 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Agreed, parking break for the Jeep clearly is vital...but 10 cars in 12 years. Same hill all 12 of them. NEVER USED PARKING BREAK. This is only vehicle to do this EVER.
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  #19  
Old 02-14-2014, 12:13 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Quote:
Originally Posted by Summit View Post
Agreed, parking break for the Jeep clearly is vital...but 10 cars in 12 years. Same hill all 12 of them. NEVER USED PARKING BREAK. This is only vehicle to do this EVER.
I get you, but all I can say is that is probably just luck. The guy who's shop my car hit had 5 previous cars hit there and all had crossed the busy 55mph highway without being hit somehow. I'm guessing one would be hit eventually...
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  #20  
Old 02-14-2014, 01:54 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

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Originally Posted by SW03ES View Post
You should ALWAYS use your parking brake. ALWAYS. ...
!!!!!!!!!!!!!!

Hard to believe that there are a lot of folks out there who never use it!!
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Old 02-14-2014, 01:58 PM
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Whilst I have always used the handbrake of previous cars, the clunky foot operated park brake of the Grand has left me using it only on gradients where I feel it's appropriate. Make it easy to use, and the likelihood of it being used increases dramatically... though it sounds like I'll have to get used to the circus act.

That said, with regard to the transmission park brake pawl not being able to hold a vehicle, this must be some shit progression of late. From early Holdens (GM) to my last Prado (Tacoma wagon), the transmission brake would easily lock the rear wheels if applied when moving. Anyone familiar with the Toyota "inside disk rotor" drum park brake would tell you that they wear to functionally useless within days of use in mud. If the Toyota transmission brake didn't hold on up to 30 degree inclines, I'd have watched my ride roll away hundreds of times. Just saying...

Cheers,
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Old 02-14-2014, 02:00 PM
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Quote:
Originally Posted by Roger Ramjet View Post
The pawl had simple worn out or broken in this case.
Yep... not virtually brand new!

Cheers,
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Old 02-14-2014, 04:59 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Quote:
Originally Posted by Summit View Post
Agreed, parking break for the Jeep clearly is vital...but 10 cars in 12 years. Same hill all 12 of them. NEVER USED PARKING BREAK. This is only vehicle to do this EVER.
You got lucky. Your luck ran out. If you don't lock your doors for 12 years and one day someone walks in and steals your TV...is it your house's fault?

Correction to what you said, parking brake for ANY CAR clearly is vital.

PARKING BRAKE. Use it when PARKING.
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  #24  
Old 02-14-2014, 05:24 PM
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Re: Holy smacks! My JGC just moved itself out of the driveway

Quote:
Originally Posted by Barboots View Post
Whilst I have always used the handbrake of previous cars, the clunky foot operated park brake of the Grand has left me using it only on gradients where I feel it's appropriate. Make it easy to use, and the likelihood of it being used increases dramatically... though it sounds like I'll have to get used to the circus act.

That said, with regard to the transmission park brake pawl not being able to hold a vehicle, this must be some shit progression of late. From early Holdens (GM) to my last Prado (Tacoma wagon), the transmission brake would easily lock the rear wheels if applied when moving. Anyone familiar with the Toyota "inside disk rotor" drum park brake would tell you that they wear to functionally useless within days of use in mud. If the Toyota transmission brake didn't hold on up to 30 degree inclines, I'd have watched my ride roll away hundreds of times. Just saying...

Cheers,
Steve
You're not really trying to tell us that the GC's parking brake is difficult to use, are you? That is simply ridiculous. Circus act? Give us all a break...and give yourself a "brake."
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