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Old 20th October 2019, 11:06
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Grey V8 Pete Grey V8 Pete is offline
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Copper washers

I have had problems recently with copper washers on brake lines not sealing properly. The first instance was a classic car banjo connection to the rear brake cylinder. The second instance was the Goodridge banjo connections on the front calipers on my Marlin Hunter / Cabrio.

Not all copper washers are the same! I had used after market ones that were in a multi pack from a well known local parts shop. These are too thin and the outer diameter is too large. The result is that they are too strong and do not deform (crush) enough, hence the leakage. This is especially important for the Goodridge banjos which have a raised ridge to assist the seal. Another factor affecting “crushability” is the hardness of the copper. The thin ones seem quite hard whereas the Goodridge ones are softer and the copper is a more pinky annealed colour.

Attached photo shows both types of washer. The correct Goodridge one is on the right.

The Goodridge ones were obtained from Demon Tweeks, link below:-

https://www.demon-tweeks.com/uk/good...washers-243438

Also available from Merlin Motorsport
https://www.merlinmotorsport.co.uk/p...1-8bsp-g-44516

A final comment is that these washers should never be reused. Fit new every time the joint is separated.

Meantime keep up the good work. The high standard is a credit to you. Peter.
Attached Images
File Type: jpg 80AB5920-13AC-49A2-A9CD-A852EED4AB04.jpg (20.9 KB, 10 views)
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