Alan,
The correct one for servo brakes is indeed longer than the one for
the clutch and non-servo brakes.
However there are several internal bore sizes available for the small
Girling aluminium master. Of these
different sizes only the .625 was ever used on the Healey. When
buying a new master for servo cars
of the correct .875 size you will find that only cast iron ones are
available today and that it is noticably
bigger than the clutch master. Note that the ones originally used
were aluminium and about the same
size as the cast iron ones available today.
Regards
Magnus
16 nov 2006 kl. 14.38 skrev Alan Seigrist Blue 100:
> Magnus -
>
> I've recently learned there are several versions of the Brake
> Master available in the market. The one I have is actually shorter
> than the clutch master.
>
> Cheers,
>
> Alan
>
> On 11/15/06, Magnus Karlsson <magnuskarlsson@bornet.net> wrote:
> Bill,
>
> The brake master cylinder shall have a larger internal bore than
> 0,625.
> If I remember correctly 0,875. That cylinder is easy to distinguish
> between
> the 0,625 because it is longer.
>
> The large bore was used in conjunction with the servo as it moves
> more fluid,
> aka gives more force on the calipers and brake cylinders, with the
> same
> pedal movement. If used without a servo it would give you a very
> stiff pedal.
> If used on the clutch it would give you a little harder pedal but
> would put a
> lot of strain on the clutch slave and mechanism as it will give a
> longer travel
> exceeding that of the slave.
>
> The small bore if used with the servo would give you a very soft
> pedal.
>
> Magnus Karlsson
> Sweden
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