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EA812
Samba Member
Joined: December 07, 2008
Posts: 1223
Location: North central, CT
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 Posted: Fri Sep 28, 2012 10:35 am Post subject: Grease attacking rubber brake hoses? |
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Anybody have problems with grease attacking the rubber brake hoses? I replaced the front hoses two times in the past couple of years now because of it. The grease from the axle beam landed on one and I noticed it swelled up like an allergic reaction;) and is sticky. The first time I thought something punctured it and it was seeping out but I found a big glob of grease on them this time. After replacing it I cut the hose to see what kind of damage was done. It seems to be only effecting the outer rubber. Maybe it’s the synthetic grease I used but I’m going to be more careful greasing the front end in the future.
This is a close up of the hose. You can see some of the grease on the firewall in the background.
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79SuperVert
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Joined: May 31, 2002
Posts: 9758
Location: Elizabeth, NJ & La Isla Del Encanto
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| Posted: Fri Sep 28, 2012 1:25 pm Post subject: |
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In my service manual VW specifically says to avoid getting grease or oil on any of the rubber hoses, and to clean it off immediately if it does get on them.
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EA812
Samba Member
Joined: December 07, 2008
Posts: 1223
Location: North central, CT
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| Posted: Sat Sep 29, 2012 10:34 am Post subject: |
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| 79SuperVert wrote: |
| In my service manual VW specifically says to avoid getting grease or oil on any of the rubber hoses, and to clean it off immediately if it does get on them. |
I think the idea behind that is so dirt doesn’t stick. I know some people believe that oil eats rubber and that may be so. There is some weird stuff in oil but what about the rear axle boots and the one piece of twenty-year-old rubber that didn’t need to be replaced on this car. The nose cone to chassis seal was covered in gear oil and it looks like it was a great preservative 
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HBRag
Samba Member
Joined: April 29, 2005
Posts: 735
Location: Huntington Beach, CA
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| Posted: Sat Sep 29, 2012 2:27 pm Post subject: |
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One will destroy brake system components with petroleum based cleaning products. Brake parts should be cleaned with brake cleaner or alcohol, because of the type of material used on the seals. This is a key reason why regular hose cannot be used to connect the resevior to the master cylinder. I don't know what the outter housing of the flex line is made of, but I would bet there is a compatibility issue causing the swelling.
The axel boots are designed for petroleum product, so that is not a good comparisons. I don't recall the specifics of the various material type, however it is generally available on the web for those interested. |
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Hotrodvw
Samba Member
Joined: July 06, 2004
Posts: 6327
Location: Orygun
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| Posted: Sat Sep 29, 2012 9:17 pm Post subject: |
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| HBRag wrote: |
One will destroy brake system components with petroleum based cleaning products. Brake parts should be cleaned with brake cleaner or alcohol, because of the type of material used on the seals. This is a key reason why regular hose cannot be used to connect the resevior to the master cylinder. I don't know what the outter housing of the flex line is made of, but I would bet there is a compatibility issue causing the swelling.
The axel boots are designed for petroleum product, so that is not a good comparisons. I don't recall the specifics of the various material type, however it is generally available on the web for those interested. |
Exactly.
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