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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 12-25-2011
Domer1970 Domer1970 is offline
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Default URGENT: What might his leak be (see Picture)?

Five days ago, I noticed a small leak accumulating around the right rear drive wheel of my Prevost Marathon XL. The color is dark brown with foam on the top. The leak has since grown bigger.

Here is the latest picture:

http://bit.ly/sj960p

Does anyone have an idea what it is? I'm thinking hydraulic fluid, but I'm not sure. I'm also thinking a recent cold snap brought about the leak, if you recall the Challenger disaster, o rings, and frost, decades ago.

The bus is 15 years old with 130K miles. Prior to my buying it in September, it spent over three years stored in a barn north of San Francisco and most of its previous life in the desert southwest.

My concern is that it is not drive able and that I will need to have it towed to a bus garage.

I will appreciate any insights.

Oh, and Merry Christmas everyone.
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Old 12-25-2011
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aaronw aaronw is offline
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Is that by the rear dual? Maybe a wheel seal?? MAybe a hydraulic jack?
The fluid looks brown, usually the jacks have ATF in them which would be red. Rear axle fluid would be brown like that.
Look under the bus at the back of the wheel area for signs of leaking. May still be driveable a short distance to the shop. See if you can get some more pics of the back of the wheel area and of the jack area.
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Old 12-25-2011
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David, is the viscocity very thin like hydraulic oil? Are the rear levellers near that area? Seems too thin to be axle related?
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  #4  
Old 12-25-2011
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Rob Robinson Rob Robinson is offline
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Probably leaking from the axel but only a visual inspection will confirm that. Be safe when you go under to check things out.....jack stands, cribbing and whatever else it takes.
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  #5  
Old 12-25-2011
mynavion mynavion is offline
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To my knowledge hydraulic levelers are not used on Prevost conversions. No frame, monocoque construction which requires air leveling. Unless someone tells me i'm wrong, rule out hydraulic leveling leakage.
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  #6  
Old 12-25-2011
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White Hat Guy White Hat Guy is offline
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David:

It looks like a wheel seal to me. I have not experienced that issue, but I've seen it. Believe Ernie Eckberg has a similar problem this past fall and Eddie Ray had one as well last year. did and that's what it looked like. Don't drive it too far - if it is getting to your brake it could be a fire hazard. Maybe somebody can jump in here with more definitive information.
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  #7  
Old 12-25-2011
Domer1970 Domer1970 is offline
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Correct. Picture shows right rear dual driver wheels.

Correct. Bus has no hydraulic jacks, uses air bags for leveling.

Correct. Viscosity is very thin. It soaks completely through a paper napkin and the resulting color is tan, not dark brown.
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1996 Prevost Marathon XL
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  #8  
Old 12-25-2011
SUCHESTOM SUCHESTOM is offline
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Looks like axle seal. Should sling oil in a pattern around inside of tire when driven after it starts leaking. Be sure the differential is full before you drive it. An oil bath axle that sits for three years can dry out the part of the bearings that are above the oil level enough to pit. Makes it possible to have a bad seal alone, or a bad seal and bad bearings. If they get bad enough to seize, they can spin the bearings on the spindle and ruin it.

I bought a Peterbilt truck that had been sitting a couple of years last year and had to put seals and bearings on both rear axles. The seals failed, and I found the bearings pitted.

Good luck. Merry Christmas
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  #9  
Old 12-25-2011
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Here's a link to a Prevost drive axle seal replacement. It's probably a little more than a do-it-yer-selfer job. There is a good chance the brake pads will be soaked, so make sure you replace them if applicable.

http://prevostmotorhomes.ning.com/fo...ay-in-the-life
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Old 12-25-2011
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David, I agree that it is likely a wheel seal, but if that is all the oil that is on the ground there would be no need to have it towed if the garage is within an hour's drive. Just bear in mind that the "wet" wheel will have a very ineffective brake.
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