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Re: Zinc alloy M20 brake shoes

I went a**e over t*t many moons ago when the same thing happened on a Bantam of all things.. Unfortunately, it was the front wheel that locked up and I was leaning on a roundabout at the time so there was no saving it... :laughing:...

Whether high zinc content shoes are more inclined to shed linings than any other I couldn't say but it is an interesting thought to ponder...Ian

email (option): ian@wright52.plus.com

Re: Zinc alloy M20 brake shoes

When I was an AA patrol one of the cars that had problems with bonded linings were the late model Ford Escorts. It usually happened when they were reversed the lining would detach and jam under the other shoe. Nine times out of ten this would happen in a multi-storey car park. Trying to get the drum off was a nightmare.

Re: Zinc alloy M20 brake shoes

Are later civilian brake shoes also zinc alloy or are they aluminum? My 1950 M21 will be due very soon for the shoes being relined.

Re: Zinc alloy M20 brake shoes

Later shoes are aluminium though you never know what has been fitted over time...The increase in zinc content was probably part of the wartime drive to save aluminium...

You'll know if you have the Zinc alloy shoes, they look like aluminium but weigh twice what you would expect..All of this only applies to the front and rear brakes on 'M' girder fork models or the rear brake only of 'M' models with tele forks and a rigid frame....Ian

email (option): ian@wright52.plus.com

Re: Zinc alloy M20 brake shoes

I went over to Saftek in Cleckheaton Yesterday and had a good chat with a very knowledgeable guy who has worked there for years. I took my M20 zink alloy shoes over for a chat about bonding or riviting the linings.
He knows all about the heavy zink alloy shoes and has relined hundreds of them using their bonding process. He assured me that the process they use to bond the modern material to these zink alloy shoes will not distort the shoe. He says that if they were distored then they have been over cooked or clamped wrongly in the process. I talked about different brake material and have chosen the woven type of material to be bonded as this material seems to work better with steel drums. They can also fit over size material so you can turn the shoes on the backplate to your drum diameter after fitting a shim between the shoes and cam. This is what i have chosen and will be ready at the end of the week with some Norton shoes i took at the same time.

Tim W

Re: Zinc alloy M20 brake shoes

Good to learn that Saftek know what they are doing Tim. I had one pair off Martyn Bratby that I had to throw away and buy some riveted shoes off him and another pair with brand new bonded linings that came in a job lot of spares that I couldn't get into the drum, so threw them away also. Ron

email (option): ronpier@talk21.com

Re: Zinc alloy M20 brake shoes

Something worth mentioning about new linings is that they are not profiled after bonding. Be it rivets or glue. The lining thickness is chosen from brake lining data books. The company I use has some very old books.
If the linings are over size, a good modern machine shop can circular mill a new profile. Much better than spinning the brake plate in a lathe.

email (option): pes.sales@btconnect.com

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