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Old 09-17-2018, 03:59 PM   #1
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Trailing Arm Crack on 2008 Knight RR8R chassis

While doing inspection under the motorhome I discovered a cracked trailing arm on the left side of the rear axle. I thought cracked trailing arms were with the RR4R Roadmaster chassis not the RR8R chassis. Has anyone else seen this trailing arm failure on their coach
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Old 09-17-2018, 04:08 PM   #2
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I may have referred to it as the trailing arm. it may be called something else. it is the support arm for the air bag and shock front of rear wheel location
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Old 09-17-2018, 05:03 PM   #3
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See these threads - I think this is the same issue your seeing

http://www.irv2.com/forums/f24/broke...ms-396465.html

Failed vertical frame 3" X 3" posts 2005 Signature

This is a 10 air bag chassis - but still may be worht readoing through
Failed vertical drive axle posts RR10
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Old 09-18-2018, 07:59 AM   #4
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That is scary! I'm getting under my coach before I leave on a trip next week.
Looks like it has been cracked for a while with the rust on it. Thanks for posting.
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Old 09-18-2018, 09:45 PM   #5
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By finding the crack I possibly avoided a serious and expensive repair that could have happened on the road.

I am wondering if this cracking was started and created by the shop that replaced my tires about three years ago, (they had to replace the tires twice as they put the wrong tires on the first time they changed them)

Thinking they could have placed their lifting jack under this now cracked support. Easier to get at then putting a jack under the axel housing

Have checked the other side and rear supports no sign of cracking

Will be repairing next week will try to post pictures of repair.
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Old 09-19-2018, 12:55 PM   #6
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Quote:
Originally Posted by doublechevy View Post
By finding the crack I possibly avoided a serious and expensive repair that could have happened on the road.

I am wondering if this cracking was started and created by the shop that replaced my tires about three years ago, (they had to replace the tires twice as they put the wrong tires on the first time they changed them)

Thinking they could have placed their lifting jack under this now cracked support. Easier to get at then putting a jack under the axel housing

Have checked the other side and rear supports no sign of cracking

Will be repairing next week will try to post pictures of repair.

Do you see witness marks from a jack on the support?
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Old 09-19-2018, 01:23 PM   #7
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Quote:
Originally Posted by doublechevy View Post
By finding the crack I possibly avoided a serious and expensive repair that could have happened on the road.

I am wondering if this cracking was started and created by the shop that replaced my tires about three years ago, (they had to replace the tires twice as they put the wrong tires on the first time they changed them)

Thinking they could have placed their lifting jack under this now cracked support. Easier to get at then putting a jack under the axel housing

Have checked the other side and rear supports no sign of cracking

Will be repairing next week will try to post pictures of repair.
While doing chassis inspections at a Yahoo Monaco Rally in Tampa two years ago I ran across a lower rear trailing arm that was bowed up about midpoint on the trailing arm. I talked with the coach owner and he had a tire repaired on that side the month before. Witness marks were present on the trailing arm and I advised the coach owner the trailing arm needed to be repaired or replaced and you have a good case for the tire shop to pay for it if you choose to pursue it. Keep a CLOSE eye on techs doing tire work on your coach !

I hope you have success in the repair and a gusset or two should ensure no issues in the future.

Cheers,

Craig
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Old 09-20-2018, 07:57 AM   #8
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I looked over my coach last night and everything is great. Had a cool day so I didn't wait for the weekend...cool for Phoenix...90s.
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Old 09-20-2018, 10:52 AM   #9
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Most think Jake Brake use is the cause for cracking on the RR10S chassis.
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Old 09-20-2018, 11:48 PM   #10
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Most think Jake Brake use is the cause for cracking on the RR10S chassis.
I can not see if the arm was used to jack up the coach but the weld looks like it lacks penetration (bad weld). I am having trouble understanding how the Jake Brake could cause this to happen. It seems to me that there would be more Horse power and torque under aacceleration while towing than the Jake Brake could ever produce while stopping.
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Old 09-21-2018, 01:36 PM   #11
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I may have referred to it as the trailing arm. it may be called something else. it is the support arm for the air bag and shock front of rear wheel location
No, it's not a trailing arm. It appears to be one of the corners of the "H" frame. Not good but repairable.
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Old 09-22-2018, 05:34 AM   #12
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No, it's not a trailing arm. It appears to be one of the corners of the "H" frame. Not good but repairable.
Now that I'm on a computer the picture shows that a large amount of force was use to break the welds and shear the metal...not a trailing arm. I have to agree that it would take jacking on that arm to break it.
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Old 09-23-2018, 07:56 PM   #13
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I am having trouble understanding how the Jake Brake could cause this to happen. It seems to me that there would be more Horse power and torque under aacceleration while towing than the Jake Brake could ever produce while stopping.
This is on the RR10S chassis. The theory is the Jake brake (not exhaust brake) applies reverse torque to the rear drive tires only. A Jake brake on high can severely jolt the entire chassis through the rear wheels. The air brakes apply braking to all wheels.
All this is compounded by poor bracing from the factory until the 2007 model.
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Old 09-23-2018, 08:37 PM   #14
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Could not find any jacking marks on the lower arm.

The arm that is cracked is the upper arm on drivers side.
I can see where this arm has slammed against the floor left and indentation on the bottom of the floor

Full wall slide is on that side along with refrigerator in the slide out.

I am waiting for local fabricator welder to show up and assess the repair I am concerned about driving the coach to a repair facility with the severity of the cracked arm and the tear in metal
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