[Dimi]

Hi Dave

The sensors you need are from RS Components.
Look for the RSF50 Series liquid float level sensor.
They are $21-20 plus GST.

These can be configured to be either normally open or closed by reversing the float on the shaft.

Just drill a mounting hole in the lid of the brake reservoir, fit the sensor and you are done.

They work very well and are the ones I have fitted to the brake and clutch reservoirs in my GT40.

It pays to include the clutch as I had a leak in the slave cylinder seal and if not for the sensor would not have known until I would have run out of clutch and been left stranded.

Dimi