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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > Can you name that sound (squeaking)?

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enblethen

Moses Lake, WA

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Posted: 11/18/22 09:38am Link  |  Quote  |  Print  |  Notify Moderator

Another possibility is a warped brake rotor.


Bud
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klutchdust

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Posted: 11/18/22 09:55am Link  |  Quote  |  Print  |  Notify Moderator

On my Jk jeep and Class C that annoying squeak had many stumped. Look for something exhaust related. My shroud would squeak until it warmed up and expanded just a bit then it stopped. My Jeep it was a cross over brace holding the exhaust. Oh yeah, then my Duramax started and the exhaust flange bracket where the pipe connects to the exhaust manifold had a crack in it. A quick weld and no more squeak.

When cold, get under your rig and try pushing your exhaust around, the shrouding, clamps and brackets. On my class C I drove with the doghouse off, yikes that was tough but I narrowed it down.

Tom_Anderson

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Posted: 11/18/22 10:45am Link  |  Quote  |  Print  |  Notify Moderator

It definitely sounds like brakes to me. It seems to be at wheel speed, not driveline speed, so I doubt it's a u-joint or carrier bearing.

Can you jack it up when it's cold and rotate the wheels? Ideally, you would put the rear on jackstands and run it while it's stationary to see if you can hear it while you stand outside. Then you could hopefully identify where it's coming from. Unfortunately, most people don't have that capability.

Have you ever replaced the brake pads? If not, I'm thinking it might be about time.

valhalla360

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Posted: 11/18/22 11:19am Link  |  Quote  |  Print  |  Notify Moderator

Had a weird thing like this where it didn't match the RPM, sometimes it happened, sometimes it didn't on our V10 F250.

Didn't believe it until the mechanic changed it but the idler pully was going bad.


Tammy & Mike
Ford F250 V10
2021 Gray Wolf
Gemini Catamaran 34'
Full Time spliting time between boat and RV


SJ-Chris

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Posted: 11/18/22 02:38pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all the great feedback and suggestions. It sounds like the first thing for me to do is have the brakes checked. That should tell me if it is the squealers (worn pads), or something with the rotors/etc. I'll keep in mind the other suggestions if it is not the brakes. I'll keep you posted.

Thanks again!
Chris


San Jose, CA
Own two 2015 Thor Majestic 28a Class C RVs

CharlesinGA

South of Atlanta, Georgia

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Posted: 11/24/22 08:40pm Link  |  Quote  |  Print  |  Notify Moderator

Front suspension radius arm bushings will squeak, and do it till they get "warm" from the squeaking and then quit.

Charles


'03 Ram 2500 CTD, 5.9HO six speed std cab long bed Leer top and 2008 Bigfoot 25B21RB.. previously (both gone) 2008 Thor/Dutchman Freedom Spirit 180 & 2007 Winnebago View 23H Motorhome.

Gjac

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Posted: 11/26/22 05:35am Link  |  Quote  |  Print  |  Notify Moderator

It doesn't sound like brakes to me, but just to eliminate that possibility I would just jack up the wheels and then spin them to see if the calipers are sticking. The next thing I would do if you feel comfortable, is bring it up to 20 mpg where the noise starts and shut off the engine and coast does the noise go away? That would tell you if it is something in or on the engine like a worn bearing in a pully. Without the engine noise it will be easier to isolate the noise you are hearing. Also, if you put it in park and rev the engine does the sound change pitch or go away?

klutchdust

Orange, California

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Posted: 11/27/22 12:51pm Link  |  Quote  |  Print  |  Notify Moderator

enblethen wrote:

Another possibility is a warped brake rotor.


A warped brake rotor will also give you a "pulsating" pedal when applying the brakes. "dragging" your brakes or riding your brakes going downhill is an easy way to do that.

bobndot

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Posted: 11/27/22 04:49pm Link  |  Quote  |  Print  |  Notify Moderator

How old is the belt ?
Check the tension on your belt . You might have a tensioner that could be failing or the belt it self needs to be replaced.

SJ-Chris

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Posted: 11/27/22 05:09pm Link  |  Quote  |  Print  |  Notify Moderator

Gjac wrote:

Also, if you put it in park and rev the engine does the sound change pitch or go away?


For talking purposes, I'm calling a "cold start" to be starting up after the RV has sat for an hour or longer.

From a cold start.... When I start the engine, there is no squeaking sound. If I let the engine sit and idle there is no squeaking sound. If I rev the engine while in park, I do not hear the squeak/chirp noise. If I drive slowly (under ~15mph) there is no sound (...this is true if I do a cold start and drive immediately, or if I do a cold start and let the engine warm up for 10 minutes before driving). The squeaking only starts once I hit about 15mph. It is sort of a rhythmic squeak/chirp noise that I can mentally imagine it *could* coincide with the tire making a complete orbit. RPM and gear don't seem to affect the sound much. After about 1.5 miles of driving, the squeak/chirp goes away. It doesn't make the noise again until the RV is parked and everything is allowed to cool.

I haven't had the chance yet to jack up the RV and try to rotate each tire. If I do get it jacked up (one wheel at a time of course) I could also pull the tire and look at the brakes to see if I can learn anything (...although I'm no brake expert). Maybe I'd be able to see the squealer tabs?? We'll see. When the front tires are jacked up, I assume I will be able to manually spin them. Not sure if I will be able to spin them fast enough(?) to make them squeak (if they are even the problem). As mentioned, when I'm driving below 15mph I do not hear any squeaking/chirp. We'll see I guess. I hope to get to this during the coming week.

-Chris

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