06-05-2021, 09:50 PM | #1 |
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Brake Drums
If you’ve ever cleaned up some 40 brake Drums you might have noticed a mark on them. This mark is there from the factory and is there to indicate the location of the wheel . The valve stem is supposed to be in close correlation to the mark for balance.
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06-05-2021, 10:44 PM | #2 |
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Re: Brake Drums
Mark on Brake Drum on 1940 Fords to indicate where the position of the Valve needs to be for better wheel balance. Very interesting. |
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06-09-2021, 11:45 AM | #3 |
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Re: Brake Drums
So, is that the heavy spot or the light spot?
I always assumed the weight of the steel that was drilled out for the valve hole in the wheel was replaced by the weight of the rubber stem. But maybe the stem actually weighs more than the steel. |
06-09-2021, 01:33 PM | #4 |
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Re: Brake Drums
Ken, Are you sure about the reason for that mark? I can't imagine folks on the assembly line matching valve stem locations to brake drum marks. It would be tedious and hard to do, I think.
Perhaps that mark is was made in the manufacturing process of assembling the brake drum and inner hub. |
06-09-2021, 01:49 PM | #5 | |
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Re: Brake Drums
Quote:
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06-09-2021, 02:31 PM | #6 |
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Re: Brake Drums
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06-16-2021, 05:06 PM | #7 |
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Re: Brake Drums
Here’s the Ford service bulletin .
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06-16-2021, 10:03 PM | #8 |
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Re: Brake Drums
Wow! That is very interesting. Thanks for posting that literature. I learned something new.
Wonder if the same "theory" is used when mounting today's tires? |
06-17-2021, 01:45 AM | #9 | |
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Re: Brake Drums
Quote:
TODAY's "theory".......GIT 'ER DONE! DD |
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06-17-2021, 10:35 AM | #10 |
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Re: Brake Drums
Nice info, I wonder if there were markings on 48-52 F1 drums? Amazing at the small details. I think there is a similar situation on 48-52 F1 fan hubs, one of the webs on the bearing is thicker to balance the fill hole and screw on the hub.
JB |
06-17-2021, 10:56 AM | #11 |
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Re: Brake Drums
All bets are off if you have aftermarket drums.
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