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Old 01-09-2006, 09:11 AM
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Banjo crush washers: copper vs alum?

I'm replacing my rear ss brake lines, and I know I need to install new crush washers on the 10mm banjo fittings at the caliper. The original Goodridge lines used copper, and the new Earl's I am ordering use aluminum. I've seen some old threads here that say copper is better, others say both work OK.

What is you current experience with alum vs copper for brake line crush washers. Does it matter? Are they both OK?

Hopefully I can avoid leaks when I put it together!

Thanks,
Dan B

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Old 01-09-2006, 10:22 AM
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I have never seen any data that says one is better than the other. If the Earls banjos come with aluminum, I say use them. Look at it this way, on my project I used AN fittings that are all aluminum, why would I switch to copper on the banjos? My Earls banjos that were asembled with the aluminum washers and they do not leak.

Vince
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Old 01-09-2006, 12:19 PM
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Both have worked for me. IMO it doesn't matter as long as they are new. Don't reuse crush washers.
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Old 01-09-2006, 12:21 PM
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Aluminum is more likely to cause corrosion than copper when placed between dissimilar metals. I wouldn't use it between cast iron and stainless. It may be more important on engine blocks where you have electric current flowing. The term is 'galvanic corrosion' and I really dont know much about it, other than it exists.
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Old 01-10-2006, 07:03 AM
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Thanks for the feedback guys. I decided to order Russell lines from Summit and they use aluminum washers.

Thanks again,
Dan B
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Old 01-10-2006, 09:51 AM
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Something I have run into on my project with Earl's banjos. On my master cylinder I switched to one that had feed ports on both sides so I could use the ports between the master cylinder and frame rail so I could get further from my exhaust. I ordered a set of Earls 3/8 X 24 banjo bolts and banjos from Summit. When they arrived I noticed they looked different from the 7/16 banjos I took off the previous master cylinder. The treaded section was much longer. As it turns out, the 3/8 X 24 banjo bolts bottomed out in the master cylinder port before the banjo tightened up on the washers. I had to get out my trusty grinder and remove about 3/16" from the end of each banjo bolt to get a secure crush on the banjo. Not a big thing, but just thought I would pass it along.

Vince
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Old 01-15-2006, 02:48 AM
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Like most things the softer (cheaper to manufacture) material always wins. Copper is less likely to deform when over tightened and alluminium will seal better if the machined surfaces are less than perfect. Even Car manufacturers are supplying alluminium as a spare part now.
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Old 01-15-2006, 07:19 AM
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Thanks for the replies guys. I used the aluminum washers that came with the Russell lines and they sealed fine.

Now, if the SS flares on the existing hard lines didn't leak I would be in business! I know, that's another story and I've researched the forum and found tons of good info to help fix that problem.

Thanks again,
Dan B
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