As is the case with many products with tarnished reputations, many people do not experience any problems at all. But - with the Mathauser finned pads - I have. It might not have occurred often. But I'm certain the people at Scott-Mathauser saw at least a few cases.
When I contacted Scotty about my pads, he didn't seem at all surprised and also sent me a replacement set, which were of the more mundane type type that resembled MAFAC tandem brake pads, except of course that they were red in color.
He also insisted I send him my old finned pads.
Fred Rednor - Arlington, Virginia (USA)
> David,
>
> I sent an off-list reply directly to John with respect to his
> earlier post
> regarding my "editorial" on Scott / Mathauser curved and
> finned brake shoes
> having "permanently" bonded pads. The basic gist of that
> communication was
> that I have never personally experienced any delamination
> problems where the
> pads somehow broke loose from their holders (...and I abused
> the living
> daylights out of a set of these for a good number of years).
> Whereas I may
> have seen pictorial evidence of such delamination as well as
> read the
> accounts of others who have supposedly encountered it
> personally, I have
> still to this day never yet heard nor read a detailed
> explanation as to how
> and/or why this may have occurred (...age related fatigue of
> the bonding
> agent ... brittlization of same due to durable exposure to
> temperatures of
> extreme? ... exposure to significant contrasts in actual
> temperature whether
> it be ambient or friction based usage induced? ... a
> manufacturing "flaw"
> resulting from improper use or application of the bonding
> agent? ... the
> unfortunate result of someone actively trying to pry loose
> the pad from its
> holder thinking that it was of the "replaceable" type? ... a
> combination of
> any one or more of these factors? ... something else
> altogether? ... if
> anyone out can knowledgably speak to this question, please do
> chime in here
> as inquiring minds want to know).
>
> Moreover, I do not know for a fact what was used as the
> original bonding
> agent although I have read what I believe to be only the
> conjecture of
> others that it was some form of "Permabond", "Crazy Glue", or
> other
> cyanoacrylate adhesive. If, indeed, that is true, it would
> be well worth
> noting that there are several variations of this type of glue
> (...and I am
> not referring to brand names here) which are intended for use
> on very
> specific substrates. That is why I made the particular
> recommendation in my
> original "For Sale" posting with regard to the use of Loctite
> Prism 406 -
> because it is specifically engineered to adhere the materials
> involved. To
> quote from Loctite's own sales literature, this agent "...is
> a low viscosity
> adhesive ideal for difficult-to-bond rubber components and
> pre-assembled
> parts. Designed to penetrate by capillary action between
> components."
> Should you wish to review the technical data sheet on this
> particular
> product, you may do so using the following link:
>
> http://tds.loctite.com/
>
> Robert "occasionally accused of being stuck in the '70's"
> Broderick
> ...the "Frozen Flatlands" of South Dakota
>
>
---------------------------------------------------------------------------------------
>
> >From: "dddd" <dddd@pacbell.net>
> >To: "Classic Rendezvous" <classicrendezvous@bikelist.org>
> >Subject: Re: [CR]A Few More Vintage Parts For Sale
> >Date: Sat, 2 Sep 2006 18:14:12 -0700
> >
> >What was the original adhesive used to bond the pink
> urethane pads to the
> >aluminum "holders"? Urethane adhesive? Crazy glue?
> >I've got one here that's starting to peel, I was hoping to
> sand the
> >surfaces and re-bond it, using appropriate care of course.
> >
> >David Snyder
> >
> >
> >----- Original Message ----- From: "John Thompson"
> ><JohnThompson@new.rr.com>
> >Subject: Re: [CR]A Few More Vintage Parts For Sale
> >
> >
> >>R.S. Broderick wrote:
> >>
> >>>CAUTION: as with all original Scott / Mathauser finned
> and
> >>>curved brake shoes and pads of this vintage, the brake
> pads themselves
> >>>have been permanently bonded to the aluminum shoes - how
> "permanent"
> >>>this bond may be after thirty years is a matter for
> speculation
> >>
> >>FWIW, I've had several sets of these in regular use for ~25
> years with
> >>no signs of delamination, and very little thinning of the
> pad material
> >>either for that matter.
> >>
> >>--
> >>John (john@os2.dhs.org)
> >>Appleton WI USA
> >
> >_______________________________________________
>
>
> _______________________________________________
>
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