Drum brakes.

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Drum brakes.

Postby Bernhard » Sat Jan 07, 2012 8:07 am

I have found that most new brake shoes fall far short of perfection as when assembled there is usually a wide gap between the shoes and the drum, I have to take up a considerable amount of the brake adjusters before I get contact, unless you have oversize shoes fitted, which are then skimmed down to fit the drum.

My method merely involved getting the shoes closer to the drum by using metal spaces slightly less the width of the flats that are bent over in both corners on the flat part of the brake shoes which kisses the pivot flats of the 2ls drum. If you have a single LS you need to make a pair, if 2ls you need to make 4 of them.
Note; don’t use any metal more than ½ the thickness of the linings or the metal spaces will hit he drum!!
Aim to get he shoes within about .020 or more.
If you have a lathe you can skim the linings mounted on the brake plate, by first fitting a .020 spacer under each of the flats, then turning down tho the exact diameter of the brake drum….. then remove all the .020 spacers.
If you don’t have a lathe don’t worry, you will have a much better brake when you pull the lever,as even more of the shoe will be in contact when the break beds in.

Also, don’t forget to file a shallow 30 angle on the leading edges of the shoe linings or the brake will grab.

If the drum is so worn that the metal spaces cannot compensate, you will have to weld even more flat metal onto all the spaces to compensate.
At one time I could buy these from my local motorcycle emporium.

NOTE!!!
Disclaimer;
Asbestos Brake dust is very harmful when machined and I will not be held responsible for any brake shoe work carried out, so always wear a dust mask!
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Re: Drum brakes.

Postby madass140 » Sat Jan 07, 2012 9:59 am

as for the twin leading shoe front brake shoes, I purchased different brands, even the Ferodo was way under size, I believe that when they were made the manufacturer believed that the correct size was 200mm whoch is 3.2mm (1/8") under 8"
I also manufacture this brake shoe , mine is correct with minimal clearance , I've sold many to people who have complained about the same problem with other suppliers.
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Re: Drum brakes.

Postby Webby03 » Wed Jan 11, 2012 4:35 pm

I've had the same problem, on my Bonnie both brakes are almost adjusted to the maximum, although they work quite well. I used the emery paper stuck inside the drum method to machine the shoes. Before I had maybe 30% contact area on the front shoes, after more than 90%. (Just a tip for those out there with no tools or money :mrgreen:)

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Re: Drum brakes.

Postby Bernhard » Thu Jan 12, 2012 8:53 am

madass140 wrote:as for the twin leading shoe front brake shoes, I purchased different brands, even the Ferodo was way under size, I believe that when they were made the manufacturer believed that the correct size was 200mm whoch is 3.2mm (1/8") under 8"
I also manufacture this brake shoe , mine is correct with minimal clearance , I've sold many to people who have complained about the same problem with other suppliers.


So, where can I purchase these brake shoes in the future when I need them?
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Re: Drum brakes.

Postby madass140 » Thu Jan 12, 2012 1:45 pm

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Re: Drum brakes.

Postby Bernhard » Tue Jan 17, 2012 7:34 am

madass140 wrote:from me, madass140@gmail.com



Thanks for the reply, but can we have your location as the postage costs across the pond are now quite high.
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Re: Drum brakes.

Postby Bernhard » Tue Jan 17, 2012 7:37 am

Webby03 wrote:I've had the same problem, on my Bonnie both brakes are almost adjusted to the maximum, although they work quite well. I used the emery paper stuck inside the drum method to machine the shoes. Before I had maybe 30% contact area on the front shoes, after more than 90%. (Just a tip for those out there with no tools or money :mrgreen:)

Webby


Nothing wrong with improvising, but exactly how do you stop the emery revolving in the drum unless you glue it to the inside of the drum…..or am I missing something here :?:
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Re: Drum brakes.

Postby xbacksideslider » Thu Jan 26, 2012 5:00 pm

Yeah, glue . . .

Or, assemble, ride, brake, disassemble, sand the witness marks, reassemble, ride, brake, dissassemble, sand, . . . . . and so on. Not as bad as it sounds, works well.
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Re: Drum brakes.

Postby mikegray660 » Thu Jan 26, 2012 6:10 pm

Ok course rather than the shadytree brake service, you could always get it done correctly

http://www.vintagebrake.com/
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Re: Drum brakes.

Postby madass140 » Thu Jan 26, 2012 9:02 pm

"Thanks for the reply, but can we have your location as the postage costs across the pond are now quite high."
Bernhard

you are right $20 for shipping from me to the US.
Shoes, front only $35 for my friends here.
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Re: Drum brakes.

Postby mikegray660 » Thu Jan 26, 2012 9:31 pm

madass140 wrote:"Thanks for the reply, but can we have your location as the postage costs across the pond are now quite high."
Bernhard

you are right $20 for shipping from me to the US.
Shoes, front only $35 for my friends here.


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Re: Drum brakes.

Postby Bernhard » Fri Jan 27, 2012 6:49 am

mikegray660 wrote:
madass140 wrote:"Thanks for the reply, but can we have your location as the postage costs across the pond are now quite high."
Bernhard

you are right $20 for shipping from me to the US.
Shoes, front only $35 for my friends here.


Kabong-nice!



Sorry I think we have crossed wires here, I assumed that you are in the states, so, what’s the postage to the UK mainland, Please?
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Re: Drum brakes.

Postby L.A.B. » Fri Jan 27, 2012 7:10 am

Bernhard wrote:Sorry I think we have crossed wires here, I assumed that you are in the states,


If our members would only bother to include their location in their profile then it could help to avoid a lot of unnecessary confusion and uncertainty - especially where buying and selling is concerned. :roll:

To add your location to your profile:
Log in >User Control Panel(top left)>Profile = Add your location >Submit.
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Re: Drum brakes.

Postby madass140 » Fri Jan 27, 2012 2:24 pm

I'll ship to UK for $20 which is less than actual cost.
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Re: Drum brakes.

Postby Webby03 » Tue Feb 07, 2012 2:56 pm

Bernhard wrote:
Webby03 wrote:I've had the same problem, on my Bonnie both brakes are almost adjusted to the maximum, although they work quite well. I used the emery paper stuck inside the drum method to machine the shoes. Before I had maybe 30% contact area on the front shoes, after more than 90%. (Just a tip for those out there with no tools or money :mrgreen:)

Webby


Nothing wrong with improvising, but exactly how do you stop the emery revolving in the drum unless you glue it to the inside of the drum…..or am I missing something here :?:


Double sided (double faced) tape. The stuff you can buy for sticking carpets down works a treat :) Just be sure to degrease the drum before and after.

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