Howdy,
I have a small story - that may or may not help...
I have a 1960 LWB Series 2 - and on this model the rear wheel cylinders are rare. Rare enough that you can't purchase them anymore so I had to get my re-sleeved by a professional brake company....
Had massive troubles bleeding the brakes - the same troubles that you described. Tried everything - including syringe and reverse bleeding.
The main problem was - you would bleed the system, everything seemed fine, come back tomorrow and there was air in the system...
In the end it was discovered that I had 2 separate problems.
* One of the wheel cylinders had a faulty bleed nipple, that was sucking air back into the brake line...
* Both of the rear wheel cylinders (after re-sleeving) had a hairline crack in them. It was only noticeable when there was 1 person pumping the brakes from inside the cabin and the rear wheels & drums were off.. When you pumped the pedal you could barely see fluid seeping out of the crack. Enough that air obviously got back in the system..
Anyway - hopefully you work out your problems. I gave up and handed it over to the local mechanic who found these problems.. He got me down and showed me with the car on the hoist - all made sense to me!
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