The steel piston will start reacting/siezing with the
aluminum bore if moisture's present. I've had that
happen to various Brit cars that sit unused - it's a
good reason to use liberal amounts of "wheel cylinder
grease" under the dust boot to help keep dry. By the
way, are aluminum cylinders truly anodized?
Regards,
JoeMulqueen
'60 BT7
'67 Landrover (often trundling thru water with 4 whl
drum brakes and aluminum whl cylinders)
--- WILLIAM B LAWRENCE <ynotink@msn.com> wrote:
> I agree that the cylinder walls should not be
> abraded because they are
> anodized to form a seal and a wear surface. I've
> also heard that honing the
> anodized coating off will cause them to oxidize and
> deteriorate.
>
> What I've found is that the cylinders don't seem to
> pit very much. I suppose
> if there were a component of electrolysis pitting
> might occur, but they seem
> pretty immune to normal chemical action in the
> brake fluid.
>
> What I have seen is solids which appear to be the
> remnants of old,
> contaminated brake fluid caked on the walls. I use
> hot soapy water, soft
> scrub and a tooth brush to clean the bores. All the
> cylinders I've done have
> come out like new.
>
> Bill Lawrence
>
>
> On 4/11/05 6:58 PM, "joe mulqueen"
> <joemulqueen@yahoo.com> wrote:
>
> > Hello,
> > Not sure about the treatment but do know that
> typical
> > whl cylinder hones really scuff into aluminum
> leaving
> > a relatively rough surface finish. Very noticeble
> to
> > the finger nail test. That said, I've had success
> > cleaning up a few cruddy (but not pitted)
> cylinders
> > using 600 paper.
> > Regards,
> > Joe Mulqueen
> > '60 BT7
> >
> >
> > Date: Sun, 10 Apr 2005 08:11:34 +0800
> > From: Blue One Hundred <healey.nut@gmail.com>
> > Subject: Re: Brake Master Cylinder Leaking
> >
> > Jim / Scot -
> >
> > You don't want to hone the aluminum bore, because
> the
> > cylinder bore is
> > specially treated at the factory to resist wear.
> > Honing the bore will
> > remove this hardened treatment and ruin the master
> > cylinder.
> >
> > Aluminum when it is untreated will wear out
> quickly...
> > that's why
> > using rebuild kits on these aluminum master
> cylinders
> > don't work long
> > term the majority of the time. If the hardened
> > surface of the bore is
> > damaged or worn in any way, your only option is
> either
> > to resleeve
> > with a SS liner or buy a new master cylinder.
> >
> > Regards,
> >
> > Alan
> >
> > '53 BN1 '64 BJ8
> >
> > On 4/10/05, Bluechipracing
> <bluechipracing@snet.net>
> > wrote:
> >> Bob: Why not hone an aluminum bore?
>
>
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