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AceTaylor
Samba Member
Joined: July 15, 2009
Posts: 156
Location: PERKASIE, PA
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 Posted: Mon Jun 23, 2025 12:03 pm Post subject: two piece brake drum |
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Am I crazy or is this a two piece brake drum. It looks as if the center section was cut from an old brake drum and glued to the inside of a new drum. It doesn't even look as if the adhesive is completely around. When it is flipped over, there clearly isn't any adhesive squeezing out.
How does this even meet Federal DOT standards?
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vanis13
Samba Member
Joined: August 15, 2010
Posts: 4381
Location: ABQ NM USA.... Except when not
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| Posted: Mon Jun 23, 2025 12:18 pm Post subject: Re: two piece brake drum |
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Fur kicks, show us the other side and manufacturer and part number
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83.5 Westy with Subaru 2.5, 4 spd manual, center seat, COLD A/C on 134a!, Winter camp heated with an Espar B4 gasoline furnace
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4Gears4Tires
Samba Member
Joined: October 08, 2018
Posts: 4158
Location: MD
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| Posted: Mon Jun 23, 2025 12:32 pm Post subject: Re: two piece brake drum |
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Probably not glued, probably friction welded.
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'87 Syncro Ferric Oxyhydroxide Superleggera Edition
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MarkWard
Samba Member
Joined: February 09, 2005
Posts: 18725
Location: Retired South Florida
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| Posted: Mon Jun 23, 2025 12:33 pm Post subject: Re: two piece brake drum |
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| It might also be casting flash. Magnet test? |
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dhaavers
Samba Member
Joined: March 19, 2010
Posts: 8380
Location: NE MN (tinyurl.com/dhaaverslocation)
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| Posted: Mon Jun 23, 2025 12:33 pm Post subject: Re: two piece brake drum |
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| AceTaylor wrote: |
| How does this even meet Federal DOT standards? |
It may, or it may not… let’s not assume. LED headlight bulbs don’t either, but they still sell ‘em.
- Dave
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86 White Wolfsburg Westy Weekender
"The WonderVan"
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ALIKA T3
Samba Member
Joined: July 30, 2009
Posts: 7179
Location: Honolulu,Hawaii and France
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zerotofifty
Samba Member
Joined: December 27, 2003
Posts: 3755
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| Posted: Mon Jun 23, 2025 5:36 pm Post subject: Re: two piece brake drum |
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The drum is formed from two pieces, a center stamping, the outer ring is cast around the stamping. that excess material is flash from the casting, a little bit of cast material that oozed onto the center stamping
that be normal, dont worry, it aint glue
See the drawing, and some photos provided above for your viewing pleasure Note the detail of the stamping to casting connection in the cross section drawing. That be what you have there.
Dont worry, be happy
The old VW Bug drum however is a one piece casting.
The reason the Van can use a center stamping is cause the van has a drum flange on the axle, thus one need not have to break free and undo the big honking axle nut to service the brakes, unlike on the Bug. The bug needs a thick cast center section of the drum, as there is no thick hub flange, just the drum on the Bug. The Van has a thick hub flange, to which the thin stamping is connected to, sandwiched between the hub flange and wheel, held together by the wheel lugs and nuts.
You good.
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