Brake pads fell off

Discussion in 'Motorbike Technical Discussion' started by mike, Sep 8, 2005.

  1. mike

    mike Guest

    It was time to steal the rear tire off the spare parts bike.
    When I pulled the wheel. The drum brake pads fell out.
    They'd completely delaminated from the shoes, intact, and fell
    off. OK....
    I'm disappointed that a perfectly good set of brakes ain't gonna
    be useful.


    Now I'm worried about that happening at 60 MPH on the
    freeway. Kinda hard to steer when the back wheel ain't
    turning and it's on fire.
    Being a grease spot on the highway ain't in my long-term

    What would one look for to preempt such a problem?
    Return address is VALID but some sites block emails
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    mike, Sep 8, 2005
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  2. Buying new shoes will keep this from happening. Just how long were those
    shoes sitting around?
    R. Pierce Butler, Sep 8, 2005
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  3. Rivetted brake shoes. Of course that means that the amount of availabe
    friction lining material available for wear is approximately cut in
    half. You have to throw away half your lining every time.

    Chemical engineers developed some kind of bonding resin to glue the
    friction material to the metal shoe in the 1940's or 1950's. I dunno
    perzactly what it is, but it looks dark reddish brown, like some kind
    of varnish. I don't even think it was catalyzed epoxy. It might have
    been a catalyzed polyester resin.

    The brake engineers are relying on the peel strength of the resin to
    exceed the frictional drag applied by the rotating drum and I'm sure
    they did all kinds of lab tests and came up with a safety factor of two
    or three times the maximum drag in order to certify their resin as safe
    for bonding whatever material they used to metal.

    But, polyester resin will dry out over the years from exposure to heat
    and dryness. Epoxies do better than that.

    If you have doubts about the strength of bonding materials, consider
    this: the pressure vessel that the Apollo astronauts rode to the Moon
    and back into the Earth's atmosphere, experiencing 9 g's on
    acceleration, and 11 g's on deceleration, was all bonded together by
    epoxy glue, and it did not come apart...
    krusty kritter, Sep 10, 2005
  4. When I would rivet brake linings, the rule of thumb was to countersink the
    holes by 2/3 to 3/4 of the total thickness of the lining. I hated that
    task. It sucked rocks. The worst were the brake bands for Cranes. What
    kind of cranes? Bucyrus-Erie, Link-Belt, etc. Nasty work.

    R. Pierce Butler, Sep 10, 2005
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