Good morning Gentlemen.
Thank you for bringing up this matter.
First we need to establish common ground. We have all known owners of these classic cars and who have spent considerable time trying to bleed their clutch.
Sometimes they bleed perfectly with almost no effort. Sometimes they just seem to enjoy making life difficult. So, irrespective of your preferred method, we’ve established that something more than conventional bleeding is sometimes called for.
Which is best? That’s easy. The best method is the one that works for you.
An old proverb says: ‘Insanity is doing the same thing the same way a second time, and expecting a different outcome.’ The poor guy who tries over and over again to bleed the system with no success is missing the need to try it another method.
As for the method in our video, it is not the only option, but it is an option. It has worked for many people. If somebody has another method, and it works, that’s great!
How does the fluid in the reservoir refill the cavity formed in front of the piston in the master cylinder? The seal in the master cylinder is of the “umbrella” variety. When you step on the pedal, the seal swells outward from the pressure and holds tightly against the wall of the cylinder. When the pressure is released (i.e. you let up on the pedal) the umbrella seal leans forward and the fluid (encouraged by the vacuum that forms in front of the piston) from the reservoir flows in to fill the void.
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