Brake Master Cylinder Problem

A problem noted back at the start of the year (see point 2) with the Vogue's brakes came home to roost last week. We were not careful enough when bleeding the brakes when I changed the brake light switch and allowed the piston to be sent all the way into the cylinder. It's a known issue in older cars. The piston encounters parts of the cylinder that hasn't been used for 48 years and tends to sieze. (The trick apparently is to place a block of wood under the brake pedal when bleeding the brakes to stop this from happening.)

Anyway, the brake pedal has been a little reluctant to return fully for a while now and the problem has reached the unsafe stage (no leaks - just internal in the M/C).

I found my spare master cylinder under the house and dropped it in to a recommended repair place last week. They have re-sleeved it in stainless steel and done a total restore. I picked it up yesterday.

The old Master Cylinder (taken during conversion). It's about the oldest, ugliest looking thing under the bonnet.

Now the sticking point. CRC soaked and all, I could not loosen the brake line going to the Master cylinder. It's thoroughly rusted in. So based on some classic car forum advice (Rover I think), I just bought this:

It's a Flare Nut spanner (wrench) - 3/8" and 7/16" AF.
Ideal for difficult pipe fitting - like brake lines.
We'll see how it goes...
The fitting is soaking in CRC56 as I type.

It's kind of ironic that we are having a little petrol (gasoline) delivery crisis in Victoria right now and my EV is off the road due to a siezed pipe fitting.