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Thread: Disc Brakes: new legislation/WOF checks

  1. #16
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    20th May 2003 - 06:18
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    Re measuring thingys

    Quote Originally Posted by Andrew
    A fine example of a paper engineer and not a practical engineer! Using Vernies wouldn't you be measuring the thickness of the lip? Isn't a micrometer a better instrument to use?


    and of course we all have a pair of those things sitting around

    firefight
    "Kiwi Biker, still a great place despite the mods "


    "Would crawl over broken glass before owning Suzuki"

    The only reason I only ride in the Iron man Class is I have no friends left to enter the two man events,
    my own fault really.

  2. #17
    More specificaly the correct tool for the job,a disc brake micrometer,which has points on the anvils to get right into the grooves.
    In and out of jobs, running free
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  3. #18
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    you guys dont realise how skilled i am with my High school 30cm plastic ruler! hah and i can measure right down to mm!!

  4. #19
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    Quote Originally Posted by Kwaka-Kid
    you guys dont realise how skilled i am with my High school 30cm plastic ruler! hah and i can measure right down to mm!!
    Now try cutting that mm into a million parts!

  5. #20
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    what on earth for? we are talking Racing tolerances here, everythings made with a bit of slop

  6. #21
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    Quote Originally Posted by Kwaka-Kid
    what on earth for? we are talking Racing tolerances here, everythings made with a bit of slop
    Just smack some grease on to take up the slop ay?

  7. #22
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    Quote Originally Posted by Andrew
    Just smack some grease on to take up the slop ay?
    Tried that on the drum brake rear..... doesnt work..... :P
    Eventually had to replace rear mainseal, and o-rings on the brake pin (running through the diff).... Drum brake in oil bath = vrey good at hill starts using front brake only
    Queiro voya todo Europa con mi moto.... pero no tengo suficiente tiempo o dinero.....

  8. #23
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    29th February 2004 - 13:00
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    Watch out ZXR350 owners

    Mine failed on the first warrant i got for bike, the front rotors come in new at 4.0mm and min wear is 3.5 so your acceptable wear is 0.25mm each side!
    And by the way new ones are $550 each!
    And yes they check with micrometer at centre of disc so no you can't use a ruler even if you could pick up 0.5 of a mm

  9. #24
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    24th March 2004 - 12:00
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    Any offers...

    I am the poor recipient of the enforcement of this legislation. It was my Ninja that failed the Wof that started this thread. Not wanting to part with $550 (EACH) I've been hunting around for a pair of 4mm disks. Does anyone out there know of any wreckers, importers even an old ZX6R wheel lying around the house ?????

    Or am I off to the bank at lunchtime ??

  10. #25
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    Hey Joe (wow, there's a song in that somewhere...) -

    You could try Graham at power motorcycles (sales@powermotorcycles.co.nz)

    He sells a heap of stuff on trademe and has a lot of auctions on trademe for replacement rotors. He could help you out.

    I've bought a bit of stuff off him recently. Seems a good bloke...
    And I to my motorcycle parked like the soul of the junkyard. Restored, a bicycle fleshed with power, and tore off. Up Highway 106 continually drunk on the wind in my mouth. Wringing the handlebar for speed, wild to be wreckage forever.

    - James Dickey, Cherrylog Road.

  11. #26
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    Quote Originally Posted by White trash
    Kawasaki owners beware!

    We probably fail one Kawasaki a week for rear disc below min thickness.

    Sorry.

    Whats the deal with Kawasaki rear brakes,I am just having one laser cut after a rear brake problem because the rear disc has between 4-6mm runout in it (ZZR250 rear wheel on a F3 Ducati) and thats the second one I know about with the same problem.
    "If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."


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    Even BP would shy away from cleaning up a sidecar oil spill.
    Quote Originally Posted by Warren Zevon
    Send Lawyers, guns and money, the shit has hit the fan

  12. #27
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    Having one Laser cut? I hope you don’t just mean from some steel plate. The problem here (I am told) is that ordinary plate has different densities & therefore heats up at different rates making warping likely. There was a crowd in Auckland doing this I don’t think they are still around because of this.

    Yamaha brakes used to always warp easily. I got some rotor kits from PFM in the UK for my SP. Weren’t totally cheap but better than many other options.
    Don't you look at my accountant.
    He's the only one I've got.

  13. #28
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    My mates rat-bike K100 BMW had a pair of rotors turned from Land Rover flywheels (he had a friend who worked in the tool room at Mitsi Motors in Porirua). good British Cast Iron plus the Brembo calipers made that PoS stop a lot better than it deserved to. This was about 6-7 years ago, 'spose you wouldn't be allowed to do that now.
    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)

  14. #29
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    Quote Originally Posted by F5 Dave
    Having one Laser cut? I hope you don’t just mean from some steel plate. The problem here (I am told) is that ordinary plate has different densities & therefore heats up at different rates making warping likely. There was a crowd in Auckland doing this I don’t think they are still around because of this.
    When I had my BMW R75/7 I had a cast disc made from a Hillman Hunter front disc,they were still crap though.

    The Kawasaki rear discs that we have the problem with are the factory discs.

    We had discs done in 4mm mild steel and have run them on the front of my 250 superkart,we have also had some done from stainless on a period 82 CBX550 which won the local club champs and in mild steel on a 91 KDX200 and we haven't had any problems with any of them.

    We havebeen told we shoul try using bizalloy? and are just looking for some info on it

    At Blenheim I was on the other GN125 without the fairing,see you at Kaitoke one day!
    "If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough power."


    Quote Originally Posted by scracha View Post
    Even BP would shy away from cleaning up a sidecar oil spill.
    Quote Originally Posted by Warren Zevon
    Send Lawyers, guns and money, the shit has hit the fan

  15. #30
    You can have aftermarket rotors,as they have no standard markings and none are required,who's to know who made them - but must be original mountings.Cast iron makes the best rotor material,but it doesn't look nice - and looking nice comes before performance in this day and age...who wants those rusty looking things on the front of a $23,000 bike.
    In and out of jobs, running free
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