Rocking during stops

Hummer H1 and Military Humvee topics
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alexberk
Posts: 1
Joined: Sat 16 Jun , 2012 2:26 pm
hummer_info: 2003 H1

Rocking during stops

Post by alexberk » Tue 19 Jun , 2012 9:50 pm

Just got the unit yesterday. Drove several miles and enjoyed the truck. One of the issues I experienced was a rocking motion backwards and forwards during stops? Any ideas ?

Thanks

Alex

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1997HMCS
Posts: 45
Joined: Wed 28 Mar , 2007 6:58 am

Re: Rocking during stops

Post by 1997HMCS » Wed 20 Jun , 2012 5:15 am

Normal due to drivetrain slack. You will learn to avoid/minimize the rocking.

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JustinOK
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hummer_info: 1998 TD HMC4
Location: Oklahoma City, OK

Re: Rocking during stops

Post by JustinOK » Wed 20 Jun , 2012 7:56 pm

1997HMCS wrote:Normal due to drivetrain slack. You will learn to avoid/minimize the rocking.
Yep, normal. Just as the vehicle is coming to a stop, slowly release some of the pressure you have on the brake pedal.
1998 TD HMC4 w/ 91K miles

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icentropy
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hummer_info: 1997.5 Hummer HMMWV
Location: Chesaw, WA
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Re: Rocking during stops

Post by icentropy » Thu 21 Jun , 2012 8:56 pm

Just so you can tell your passengers when they ask, it's due to a few different things.

1. inboard brakes means any play between the hubs and the rotors will come into play here.
2. geared hubs also add more play than an average vehicle would have.

all together add up to the amount of play that lets us enjoy a nice little rock-a-bye if we don't modulate the brakes right before the complete stop.

So when someone asks why your truck rocks at a stop, just say it's cause of all the cool unique features in the drive line. :D
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1994 HMC4 lots of mods (borrowed)
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ebicker
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Joined: Wed 14 Mar , 2007 9:15 am

Re: Rocking during stops

Post by ebicker » Thu 10 Jan , 2013 12:59 pm

Its the Geared Hubs. There is no other reason for the rocking motion.

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h1sp
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Location: TEXAS

Re: Rocking during stops

Post by h1sp » Fri 11 Jan , 2013 8:59 am

slow stops reduces the rocking, but all my passengers love the rockin. "fun stuff"
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j-paa
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Joined: Wed 16 Jul , 2008 12:12 pm
Location: Richmond, BC

Re: Rocking during stops

Post by j-paa » Mon 11 Mar , 2013 8:55 am

I remember when I first test drove a hummer I noted the same thing and was very un-nerved by it.

As others mentioned, driving technique can almost completely eliminate it (if you want).

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