Replacement rear drum brake mismatch - '69 Bay

[KTPhil]

Here is the drum that is on the car now, PN 21105010615G:

This is the axial measurement from inner to outer surface:

The EMPI replacement has a longer, incompatible measurement, and so of course can't fit:

Also, the rim is shaped differently, and may or may not fit the stock backing plate; original on left, new drum on right:

I'll return the drum, and am using the old one temporarily. My source is usually impeccable. Anyone know what gives?

[joey1320]

As long as the supplier can source the correct one, chalk it up to bad luck and move on.

BTW, I recently got a '69 Bay and will be doing the brakes during the winter months. Can I ask, how much do the drums cost you?
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**1971 Super Project
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

[busdaddy]

Looks like you got the correct drum for a 70, but your bus has been subjected to some wrecking yard parts fuckery, I suspect the stub axle is a later (71+) version and someone modified the drum to work, likely with a bonus backing plate just to mess with your head.
https://www.thesamba.com/vw/forum/viewtopic.php?t=700973&highlight=early+drums
https://www.thesamba.com/vw/forum/viewtopic.php?t=425910&highlight=axle+length
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[aeromech]

Replacement hubs suck
Replacement drums suck
OG steel doesn’t suck. Always try and buy OG if possible.

Resellers like the busco or similar places might help
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
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Capable of leaping tall buildings in a single bound

[KTPhil]

Ok, so the plot thickens! Thanks for the info, more investigation to come.

So I started by replacing shoes and wheel cylinders. That RR backing plate was bent all to hell, south a hole enlarged where the wheel cylinder fit on top.

So the next weekend, I installed a new backing plate. It looks like the one on the right:

My old drum looks like that, too.

My new drum looks like the one on the left.

So does this imply I have a later stub axle?
Can I just get a drum that looks like the one on the right?

I'll take this drawing to the shop when I exchange the drum.
Not 100% sure of the answer yet, but this is a positive direction and explanation.

I've been wrenching VWs for 50 years but Bay Buses are new to me. Prior owner flubs are common to all models, I am finding!

Thanks, guys, I'll probably find a long trail if this kind of crap...

[aeromech]

I would source an OG backing plate. I can’t tell you how many Chinese parts I’ve tried to fit only to find that those people really don’t care when they make it
_________________
Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound

[kreemoweet]

[airschooled]

[KTPhil]

The new backing plate I installed was about twice as thick as the old bent one, and fit really well, so I don't think that is the problem. Given the bad shape (literally) of the plate I took off, this is an improvement! The new one is from WW, PN 211609440D, stated as being for '68-'70. It has the double lip at the perimeter like the one on the right in the diagram above.

The drum measurement doesn't match, so I'll start there. I'll check that other thread and look into exchanging the drum. Who knows the history of a 50 year old used Bus, but I am getting a lesson!

[KTPhil]

Neglected follow-up: I got a replacement new drum that fits the new backing plate, and with slight grinding of the new drum for clearance against one part of the backing plate, all is well.