Rear brake drum bearing

Started by colinbrannigan@aol.com, June 07, 2026, 07:48:44 PM

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colinbrannigan@aol.com

Thanks very much Wessex for the answer

Kind regards Colin

wessex_man

Cant see I've seen any washers like that fitted.None on mine.

colinbrannigan@aol.com

Thanks very much for the reply Wessex, your explanation and photos made it much easier to understand and now having fitted the bearing with the adaptor sleeve from club spares it all makes sense.

Just to clarify the large washer/spacer in the photos is not a stock item so the brake plate is fitted against frame with no spacer in between.

I am halfway through dry fitting the forks together before painting and have things I am not sure about so expect anther post next week.

Thanks for your time

Kind regards Colin

wessex_man

#2
Hi Colin welcome to the forum and the World of Sunbeams.
What you have pictured is part of the detachable wheel assembly what holds the brake drum in position when you remove the wheel. It looks at some point the former owner has had problems and modified it to suit their needs.

Quite how it's position with respect to the spindle is concerned is a bit difficult to explain and I think it's best to have to look at how the QD wheel assembly is made up. My take on it is it is essentially a sandwich of spacers held in position by the tightened wheel spindle.
Looking from the brake drum side you have a nut, washer, rear frame lug, anchor plate with brake assay, brake drum assy, Wheel hub assy, cotton reel spacer Frame lug washer and finally a Nut. The act of tightening the knock-through spindle holds it all together.

Looking at the brake drum assy it's made up of the bearing which is pressed and peened into the drum. The piece which you've pictured passes through the bearing and anchor plate assy. The slots should slide in the frame lugs washer is fitted and then a locking nut so the drum and anchor plate are remain fixed in position. This means that the drum assy and chain stays in place and you can remove the splined hub for changing tyres.

The wheel hub is bolted to the brake drum assy. There are two bearings fitted and a hollow shaft. Though which the knock through spindle passes.  It then passes though a cotton reel type spacer the other sides frame lug washer then nut. Some pictures hopefully they help. Ignore the snail cam wheel adjuster on this one Marston's only did it in 1930 ish it will be a washer in yours. Your wheel adjusters should go through the frame casting

colinbrannigan@aol.com

#1
Hi there,
As this is my first post since I became a member let me introduce myself, my name is Colin and I am from Swansea, I recently bought a 1932 Model 9 Twin Port it was in big pieces, very rusty with quite a lot missing so it will require total rebuild, I am ex Bowden toolmaker where I worked for forty years in Llanelli when that closed I then worked for Hi-lex another cable manufacturing company, so that's me and now down my first problem.

The rear brake drum set up with the bearing, I understand the bearing is pressed into the drum but what controls it's position on the spindle, I have added photos of my set up and you can see a spacer with two tapped holes, I can't see this item in the spares book, I would be glad of any advice.

Also is there a washer in  between the brake plate and the frame, again I can't see it in the spares list.

Thanks for your time

Colin