Violent shaking on 6% grade

[Super8mm]

Coming out of Denver on I-70 I started down that first 6% grade and was trying to apply a light brake (3 bars) and truck and trailer shook violently.

I had a 6% grade. 2 days ago and I had no problems.

What could cause this. I had the front alignment. Checked last week, tpms on truck and trailer indicated all was ok.

 

[houstonstroker]

What is your tow vehicle? Plenty of Ford threads out there describing a death wobble.

 

[325BH]

What is your tow vehicle? Plenty of Ford threads out there describing a death wobble.

Boy, what a leap.

Next to know info and you jump to that? LOL.

 

[Super8mm]

I thought my signature line was showing.

Truck is a 2011 GMC 2500 HD Duramax pulling a 2013 356 Puma toy hauler.

 

[bshort]

Taking a wild guess here, but sounds like warped rotors on your TV.

 

[uhduh camping]

Boy, what a leap.

Next to know info and you jump to that? LOL.

Right! I don't think the term "death wobble" has ever been mentioned on a RV Forum.

 

[gloryracing]

Taking a wild guess here, but sounds like warped rotors on your TV.

That would be my first guess as well.

 

[Super8mm]

Taking a wild guess here, but sounds like warped rotors on your TV.

May be but under 45 mph or on fairly flat I don't feel any anything just smooth when I apply brake

 

[Super8mm]

Right! I don't think the term "death wobble" has ever been mentioned on a RV Forum.

I had this on a motorcycle and that is exactly what my first thought was.

 

[houstonstroker]

Well now since his truck did not show up in his signature I was just guessing. The dreaded Death Wobble for Fords has been around quite awhile. I have an F250 but have never encountered the dreaded wobble. If you Google Chevy and death wobble, it appears that this also effects Chevies. Mostly it has to do with some loose of bad steering parts. I dunno maybe something is loose and the down hill jaunt made it worse. Google Death Wobble and see if it fits. There is even Youtube videos, go figure.

 

[fonzie]

Maybe just a bad hill with ripples in pavement....

 

[houstonstroker]

And guess what, I'm a member on the RV.net board and if you search death wobble you get two pages worth of reading.

 

[Wobbles]

Right! I don't think the term "death wobble" has ever been mentioned on a RV Forum.

Somebody call? Lol... My money is on warped rotors.

 

[Super8mm]

Well now since his truck did not show up in his signature I was just guessing. The dreaded Death Wobble for Fords has been around quite awhile. I have an F250 but have never encountered the dreaded wobble. If you Google Chevy and death wobble, it appears that this also effects Chevies. Mostly it has to do with some loose of bad steering parts. I dunno maybe something is loose and the down hill jaunt made it worse. Google Death Wobble and see if it fits. There is even Youtube videos, go figure.

Thanks, t chevked lug nuts on both and want see any sign of any seal failure

I would have thought the folks that checked the alignment would have caught OT.

 

[TheGerman]

Actually I've seen pretty violent death wobble on an older motorhome, so RVs are not immune

Technically speaking, warped rotors pretty much don't happen. What causes the pulsating brake feel is uneven wear and/or uneven material transfer from the pad onto the rotor. The weird thing is that it can show more or less depending on brake temperature and pedal pressure. A few years back I had a Grand Cherokee that did vibrate and shake under light braking on a long downhill but had never any problems when braking normal or hard.

 

[Super8mm]

Maybe just a bad hill with ripples in pavement....

Actually it was fairly new resurface and nice and smooth

 

[Pillboxmc]

Check your u joints, that is what my semi did. U joint just starting to dry up, worth a try!

 

[Lawrosa]

As stated there is no such thing as warped rotors/drums. It just dont happen.

From my experience that vibration you felt was most likely from the rear brakes/drums.

I would say from getting overheated and the rear brakes may be over adjusted.

over adjusted the rears grab before the fronts and dragging them down a 6% it would rear its ugly head like you experienced..

Just my opinion though.

 

[Super8mm]

Check your u joints, that is what my semi did. U joint just starting to dry up, worth a try!

I will go take a look at them

Thanks

 

[Super8mm]

As stated there is no such thing as warped rotors/drums. It just dont happen.

From my experience that vibration you felt was most likely from the rear brakes/drums.

I would say from getting overheated and the rear brakes may be over adjusted.

over adjusted the rears grab before the fronts and dragging them down a 6% it would rear its ugly head like you experienced..

Just my opinion though.

Its worth taking a look at when I get on level ground

Thanks