Can't speak for a TD but on an MGB you have to remove fluid from the master
when replacing the pads. 1/2" below is the level for those two, but even so
I occasionally find it has overflowed onto the top of the master in normal
use. The much greater diameter of the calliper pistons and pad material are
obviously a factor in that, but BL cars of the era with drums all round
still had sponge rings around the filler cap/neck to absorb any overflow.
If the expansion bottle on the TF owner has the tube projecting down through
the master cap an appropriate amount then fluid level will be maintained at
the bottom of that tube - assuming the master cap is non-vented, the vent
being on the expansion bottle cap. This is how the Gunson's Eezibleed
works.
But with an expansion bottle and non-vented cap it wouldn't matter if the
master were completely full, that is what happens on radiator systems with
remote expansion tanks.
PaulH.
----- Original Message -----
> I'll take a guess... The low level is made on the assumption that your
> brakes will be partially or totally worn. When you put new shoes in,
> there
> needs to be enough room for the fluid to rise without leaking out.
>
>
> -----Original Message-----
> The TD handbook says to fill brake master cylinder to a level 1/2 inch
> elow bottom threads of the filler neck. That leaves a large volume of
> air
> bove the fluid, far more than would seem to be needed for expansion.
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