The one on the right in the picture is the one that leaked down and now clutch pedal goes to floor

Both master cylinders are after-market. A 1966 model would have had all metal "bean can" reservoirs.

Like this:


But the after-market clutch master cylinder with the plastic reservoir will work just fine.

Here is a picture of my set up

Good catch Willie!

I was thinking master cylinder in my reply, as that's where the problem usually occur.

+1 to Willie's suggestion to post a photo of what you have. Show us your clutch slave cylinder as well.

Your car was originally built with the bean can style clutch master and an almost identical brake master. It was not built with a 1275, so that suggests changes may have been made in the 56 or so years of its life.

If the fluid leaked out and ruined the carpet then your slave is not the problem, your master is bad.

As far as what part you need post a photo of the underhood master. There have several through the years and who knows what has been installed in the past and if it is correct for your system.

Thanks for the reply, car has sat for a year and the fluid leaked out of resivor and runt the carpet.   Any recommendations on which one to by, it is a 1966 Countryman with 1275cc

+1 for replacement. And I will shake the hornet's nest, Use DOT 5 Silicon Fluid, you will not have the problem any more.

You could rebuild it, but that would very likely include having to hone the bore. Most of the wear would be midway down the bore, making it very slightly barrel shape. The new rubber might follow the bore for a while, but eventually start to give problems. I'd opt for a new one.

Bleeding should be easy as the bleeder on the slave cylinder is a short distance from the master. Might be better to bench bleed the master first to get the air out of it. After that it should quick and easy.

How do you bleed slave cylinder for clutch pedal, are they worth rebuilding or should I replace hole unit, on my 1966 Countryman

Thanks Brian