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Thread: Drum Brake Arcing

  1. #1
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    Drum Brake Arcing

    My 53 Thunderbird has a very poor 7" SLS front brake.
    Its hard to look like Marlon Brando when you can't stop.....
    Research has led me to getting some self aligning shoes to replace the pivot type.
    I was down at the local brake shop and there was a Speed Twin wheel identical waiting for 'Brake Arcing"
    I think if it improved the brake its probably worth a punt.
    Do they use a machine?
    DeMyer's Laws - an argument that consists primarily of rambling quotes isn't worth bothering with.

  2. #2
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    its going to either be machining the drum back to round or re-curving the shoe surface to match the drum. did they have a lathe big enough to spin a 19" wheel?
    it's not a bad thing till you throw a KLR into the mix.
    those cheap ass bitches can do anything with ductape.
    (PostalDave on ADVrider)

  3. #3
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    They don't do the wheel just the shoes.
    I'll enquire as its probably worth doing.
    DeMyer's Laws - an argument that consists primarily of rambling quotes isn't worth bothering with.

  4. #4
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    Usually, it's machining the assembled shoes/backplate to around .010in undersize to the drum.
    Chamfer the leading edges suitably - and cut water/dust removal grooves.

    Done it many times. Always worth doing.

  5. #5
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    Check and tighten spokes first so the hub is under the correct tension. Then get the shoes done.

    You can arc the shoes yourself with sandpaper glued to the drum but it’s a pain in the arse.

    I did my ‘57 3TA myself when I was young and impoverished. Made a big difference but would send to the brake man next time.

    Some truck brake shops can spin a bike wheel. Car brake shops usually can’t.

  6. #6
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    Quote Originally Posted by Voltaire View Post
    My 53 Thunderbird has a very poor 7" SLS front brake.
    Its hard to look like Marlon Brando when you can't stop.....
    Research has led me to getting some self aligning shoes to replace the pivot type.
    I was down at the local brake shop and there was a Speed Twin wheel identical waiting for 'Brake Arcing"
    I think if it improved the brake its probably worth a punt.
    Do they use a machine?
    Just extend the lever arm on the drum for more leverage.
    or i seen one years ago where they converted a std drum to hydraulic actuation they used mini wheel cylinders if i recall correctly.
    there are plenty of discrete levers with remote reservoirs on the market these days.
    Failing that stick a 8 inch bsa drum in it only a rivot counter will notice.
    Besides Marlon Brando never worried about brakes unless he was going past a burger bar.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  7. #7
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    Quote Originally Posted by husaberg View Post
    Just extend the lever arm on the drum for more leverage.
    or i seen one years ago where they converted a std drum to hydraulic actuation they used mini wheel cylinders if i recall correctly.
    there are plenty of discrete levers with remote reservoirs on the market these days.
    Failing that stick a 8 inch bsa drum in it only a rivot counter will notice.
    Besides Marlon Brando never worried about brakes unless he was going past a burger bar.
    rivet....

    OMG....8" brake drum...no way. I've got anoraknaphobia.
    DeMyer's Laws - an argument that consists primarily of rambling quotes isn't worth bothering with.

  8. #8
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    Quote Originally Posted by Voltaire View Post
    rivet....

    OMG....8" brake drum...no way. I've got anoraknaphobia.
    Meh, i am not sure i would care if anyone noticed my R6 monoblock and 320mm Brembo never came out as an official option on a RD350B (i just need a set of TZR250 1KT forks and yokes to make them a bolt on.)
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  9. #9
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    Quote Originally Posted by husaberg View Post
    Meh, i am not sure i would care if anyone noticed my R6 monoblock and 320mm Brembo never came out as an official option on a RD350B (i just need a set of TZR250 1KT forks and yokes to make them a bolt on.)

    anyway if you get bore count the Rivets on this
    https://www.youtube.com/watch?v=VykzdDTOHmU
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  10. #10
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    Quote Originally Posted by husaberg View Post
    Meh, i am not sure i would care if anyone noticed my R6 monoblock and 320mm Brembo never came out as an official option on a RD350B (i just need a set of TZR250 1KT forks and yokes to make them a bolt on.)
    How would they ever notice it in your shed?
    Don't you look at my accountant.
    He's the only one I've got.

  11. #11
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    Quote Originally Posted by F5 Dave View Post
    How would they ever notice it in your shed?
    I could post pics? of the shed on the net.
    plus its a big shed room for plenty of people
    Got any TZR250 1KT forks?
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  12. #12
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    Quote Originally Posted by husaberg View Post
    I could post pics? of the shed on the net.
    plus its a big shed room for plenty of people
    Got any TZR250 1KT forks?
    I gather the picture I sent you of the forks I have were the wrong ones.

  13. #13
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    Quote Originally Posted by Drew View Post
    I gather the picture I sent you of the forks I have were the wrong ones.
    I cant remember getting a pic but you said they were a different diameter plus they were side mounted mudguard. The TZR250 1KT ones are 39mm and have top mounts and provision for 320mm discs.
    I think the ones you described were early FZR ones with 280mm discs
    the only ones that i know of that had the 320mm discs were the first TZR250 a couple of Japanese market SRX's the TDR250 and the OW01 and the FZR1000 (early) and i think a japanese model FZR750 and maybe a higher spec TRX850 that we never got. the FZR1000 forks and the rest are 41mm or maybe even bigger.
    The early FZR250 2kr has the 320mm disc with 36mm forks as does a couple of other SRX's
    plus i think the late FZX250 Zeal has the 38mm forks and the 320mm disc either of these would be okay also.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  14. #14
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    The real answer is yes - yes it is worth it...

    I had a problem with the rear drum on the Trophy. New shoes just made it worse. The brake hardly worked, most of the adjustment was used up, the lever was at the wrong angle etc etc etc. Eventually I realised that the ‘new’ shoes had a metric sized material which was a smidgeon under the originally imperial one. Considering the drums 50 years old and has seen a fair few miles its little wonder it wasn’t flash.

    So – took the whole thing in and the brake shop put oversized linings on the shoes and machined them to fit the drum. Now much much better.

    Remember though back in the day these bikes used asbestos linings and the modern stuff isn’t quite so good… Originally I could lock up the front on those brakes (with provocation) after fitting proper linings…

    ALSO check that you have the correct handlebar lever. There are 2 types with different distances from pivot to cable end to suit Norton or triumph. Get the wrong one and your brakes rubbish…

  15. #15
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    Probably just had stronger hands back then Paul.

    Or 'Provokers'
    Don't you look at my accountant.
    He's the only one I've got.

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