Drum Brake cleaning

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Rusty Ferrell
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Drum Brake cleaning

#1 Post by Rusty Ferrell » Wed Jun 13, 2018 1:44 pm

Recently purchased a 62 which has been apart and on jackstands since sometime in the 90s. I'm in the process of installing the wheels and tires, but first the transaxle, so I can roll the car a bit.
Cleaning the brakes drums I noticed there is a wire or spring steel around the diameter of the AL between the finned outer drum and the steel center which is cast with the aluminum. How is the drum built and what is the purpose of the spring wire?
Wishing all you 6ers out there a healthy day,

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David Jones
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Re: Drum Brake cleaning

#2 Post by David Jones » Wed Jun 13, 2018 2:20 pm

That was an aftermarket accessory supposed to reduce brake squealing. More snake oil from the 60's. Take it off and throw it away or sell it on E-bay.
If I had known I would live this long I would have pushed the envelope a little harder.
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Martin Benade
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Re: Drum Brake cleaning

#3 Post by Martin Benade » Wed Jun 13, 2018 2:31 pm

If it is at the edge junction of iron liner and aluminum, I believe that is factory, an attempt to dampen vibrations. Often those are missing with no ill effect. The liner is shrunk in and will not fall out as long as the drum is in spec.

bil brown
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Re: Drum Brake cleaning

#4 Post by bil brown » Wed Jun 13, 2018 5:33 pm

the iron liners have a machined "hook" on the inside edge that, when shrunk in the drum, mate with a like machined area in the drum, for the two to lock together after cooldown.
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Geoff Fleming
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Re: Drum Brake cleaning

#5 Post by Geoff Fleming » Wed Jun 13, 2018 8:21 pm

I doubt this was done by the factory...seemed to be a 'home remedy' back in the fifties and sixties, used by quite a few owners. If memory serves, I believe it was even mentioned in Porsche Panorama as a means to dampen braking noise.

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Adam Wright
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Re: Drum Brake cleaning

#6 Post by Adam Wright » Wed Jun 13, 2018 8:28 pm

I always need stories for my Barn Find column in the magazine, if you have a good story to share, please let me know.

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