[Healeys] Master Cyl - thoughts

[michaelsalter at gmail.com]

In my experience the first indication of problems with aluminum cylinders which have been honed to the extent that the anodizing is damaged is that the fluid starts to go black. 

The blackness is caused by material that has worn off the back outer corner of the seal as a result of the pressure in the cylinder being sufficient to squeeze the seal into the enlarged gap between the piston and the cylinder wall.

At the first sign of brake fluid becoming black the cylinder seals should be checked for wear on the shoulder of the seals where they bear against the piston. 

If this is not attended to the seal will eventually be cut through just inside the outer rim resulting in instant and catastrophic failure often without any other warning and usually during a panic stopb& 

Been there, done that, not pretty.


Michael S

BN1 #174













From: I Erbs
Sent: bSundayb, bFebruaryb b9b, b2014 b5b:b30b bPM
Cc: healeys at autox.team.net





I had to hone lightly my brake master as I did not have accesses to a
replacement unit. It has been in my car for 5-6 years without failure . I
have a new unit when I need to replace it.

Ira Erbs
IT Educator and Consultant
Portland, OR.

Sent from my mobile phone. What you get may not be what I typed.
On Feb 8, 2014 8:11 PM, "Steve Gerow" <steveg at abrazosdata.com> wrote:

> There's a lot of info online about aluminum master cylinders - auto shop
> class manuals and the like.
>
>
>
> What I read recently was: new anodizing is sort of gray. Some wear will
> show
> as more polished and that is still good.
>
> Longitudinal scratches not good, especially if you can feel them with your
> finger.
>
>
>
> A used anodized cylinder without scratches is suitable for a rebuild kit.
>
>
>
> Also new ones are inexpensive - why would you hone anyway?
>
>
>
> Nowhere does anyone say honing aluminum master cylinders is good,
> especially
> considering the low cost of new cylinders.
>
>
>
> I wonder if that mechanic years ago was saying genuine Girling master
> cylinders are crap or was he talking about some aftermarket cylinders of
> dubious origin.
>
>
>
> Not intending to start a flame war.
>
> --
>
>
>
> Steve Gerow
>
> Altadena, CA, USA
>
> BN6
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