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Gunfighter
Samba Member
Joined: May 25, 2004
Posts: 39
Location: Baton Rouge, Louisiana
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 Posted: Fri Feb 08, 2008 9:32 am Post subject: 65 Rear Brake Drums |
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Doing a complete restoration on my 65 Beetle. When taking the old rear drums off I noticed they were of two different designs. One had ribs one was a smooth cone. After research I discovered the smooth cone was the correct ones for my year.
Since they are used I don't know at which point the drum is to thin to be reused.
Does anyone know the factory specs on wall thickness?????
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Tom
1965 Beetle |
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L572
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Joined: April 20, 2002
Posts: 704
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| Posted: Fri Feb 08, 2008 9:51 am Post subject: |
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Gunfighter: The maximum diameter that the drum can be turned to is usually stamped/cast into the inside of the drum. You may need to scrub the inside well with a scotchbrite pad to remove the brake dust and rust to see it. Off the top if my head I can't remember the exact spec. for the 65 drum....maybe someone else can look it up. Look at page 125 from the 1969 Without Guesswork manual with the max diameters and minimum wall thickness as well as run out. I'm not sure how much difference (if any) there might be with the '65 drum....these numbers seem familiar for my '65.
http://oacdp.freeweb7.com/wog69.html
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L572
Last edited by L572 on Fri Feb 08, 2008 9:57 am; edited 2 times in total |
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drscope
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Joined: February 19, 2007
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Location: Baltimore, Maryland USA
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| Posted: Fri Feb 08, 2008 9:51 am Post subject: |
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Sorry I don't have the specs with me. But heres a few things to think about.
You have 2 drums that don't match. If you want to do a nice job, you are going to need to replace one of them. I'm not sure you can get new smooth ones anymore.
If you have them turned, you are removing material and therefore the drums ability to contain and disipate heat is diminished a bit. Usually this is not a factor on a street car.
but you need to get some pricing before you get them turned. Look around and price new drums so you know what you are dealing with. And price getting your old ones turned.
It is an on going joke at auto parts stores that do service work where they charge a customer $20 to turn a rotor that could be purchased new at the parts counter for $13. This happens all the time. So before you pay someone $40 to turn your drums, you may want to consider replacing it for $60.
If you look at your ribbed drum, you may find the tolorance measurment cast into the drum. Some have it, some don't.
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djkeev
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Joined: September 30, 2007
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Location: Reading Pennsylvania
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Cusser
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Gunfighter
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Joined: May 25, 2004
Posts: 39
Location: Baton Rouge, Louisiana
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| Posted: Fri Feb 08, 2008 12:35 pm Post subject: |
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Thanks guys for the info. Both these drums although mismatched look to be in pretty good repair or I wouldn't even consider using either of them. I have a friend with several used drums that may work depending on the wear which is why I was wondering about the specs. As far as turning them goes I can get that done for free so that's not an issue for me.
Thanks again
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Tom
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Gunfighter
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Joined: May 25, 2004
Posts: 39
Location: Baton Rouge, Louisiana
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| Posted: Fri Feb 08, 2008 1:14 pm Post subject: |
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Both the drums that came off the car measure 9.073 which is approaching max diameter (9.114) so I will spring for new drums.
Thanks again for the help.
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Tom
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L572
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Joined: April 20, 2002
Posts: 704
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| Posted: Fri Feb 08, 2008 3:29 pm Post subject: |
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| Gunfighter wrote: |
... As far as turning them goes I can get that done for free so that's not an issue for me.
Thanks again |
I found that when I took my rear drums into the shop they couldn't fit them on the lathe because of the relatively small diameter of the splined axle bore. You might want to check with the shop before you assume they can do it.
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L572 |
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