A was for Austin, but now B is for Bedford

Six bits of flat welded around a smaller socket works too.

i withdraw all my comments as the system is nothing like I imagined . Sorry.

Thankyou all, prepare for another tedious reply . . .

Swishy: When I first delved into playing with trucks I bought a handy set of wheel sockets and brace, all nicely packaged in a zipped bag. They sufficed for all awkward size nuts not covered by my existing tools until it was time to undo that one troublesome nut. Please note I had an open end spanner the right size but the brass fitting was more inclined to succumb and round off rather than budge. (Even my trusty VW 12 pointed socket failed - being 0.3mm too small!)

jon_d: Too much like hard work, by this time I just wanted to get it fixed. This will now join my other tools for the next time it is needed. I could have bought the cheaper one if I was prepared to wait for them to order one in, but as the one I bought was also a deep/long reach item it will possibly be more adaptable for a wider range of needs.

John.K:  All comments were worthwhile as the saga progressed, more power to the collective brains trust.   I even shared a summary of ALL the suggestions with John.D in case any triggered an idea to help solve the problem. AND I am sure this whole drama has gone beyond what any of us might have imagined as it progressed. Hopefully somewhere down the track it might assist somebody dealing with similar issues.

Now I have to wait until my wife brings it back on Tuesday so I can fit it (hopefully for the last time) and have it working as it should. 

I suppose it’s too late to say I’ve got a 1 5/16 " 3/4 drive socket and breaker bar here and I was in Adelaide on Friday and could have dropped it off with John.
Gumpy

jon_d: Too much like hard work, by this time I just wanted to get it fixed. This will now join my other tools for the next time it is needed. I could have bought the cheaper one if I was prepared to wait for them to order one in, but as the one I bought was also a deep/long reach item it will possibly be more adaptable for a wider range of needs.

Yep,  I was suggesting for an idea in the future.

I learnt my lesson with cast (?) Clayton Delaware master cylinders. The cylinder has to be treated with the utmost 'respect'.   I broke a pipe flange fitting off mine when trying to remove a nut.

That was after I shredded the seals when trying to bleed the brakes on said old rusty master cylinder.   The things you learn on along the way.

Wife suggested that I go down and get it on Friday, plus call in at daughter's house while down there (a mere two to three hours side trip ). So off I went and returned about 4:30pm, utterly exhausted from having spent approximately four hours in city traffic. Oh for the country life and leaving the city behind! 

Then last night wife said she could hear water running outside the back door, to discover the evaporative air con on the roof was spraying a mist from a metal braided reinforced pipe. The old unit that used to be up there had to be at least thirty years old and never leaked - the new one has been up there three years or so!   Almost 76 years old and climbing around on the roof is not advised, but why not . . . old one removed, new one acquired from local hardware store, and suitably left to one side for later reinstalment. I might be silly enough to get up on the roof, but as the temperature is currently thirty four degrees, it can definitely wait until later. 

Down to the nitty gritty instead . . . major struggle refitting the master cylinder and booster. Rather than jacking it up and supporting while attempting the dreaded brake tube to fitting alignment (shaky/dodgy at its best) I grabbed some of those handy pavers and constructed an instant support tower.



It was probably debatable which method was best but the result was ultimately the same. I'm sure that servo and master cylinder gets heavier each time I do it. Once it was back in place I needed to recuperate, simply too hot out there. Consequently I've stopped for lunch and will leave the fiddly connections not yet done until tomorrow.
 

At least you recognise it's not the best place to scramble about up on a roof in high temps. Those braided hoses are crap quality on a good day. It's only plastic tubing inside the braid which does next to nothing. Caravan J.Guess fittings n connections are better quality but if there is no vibrabration up there I would use copper tubing. 
Good progress on refitting the master cylinder n booster. Let's hope all is good in the world of brakes for you.

Thanks cobbadog, I also hope all will be well. How are your travels going, still round the Eyre Peninsula, or heading east again?

Did you notice the cunning use of a large ring spanner to gain some additional height under the servo?

Although I must admit it was used by chance to gain some extra height and because it lay handy to reach (i.e. easier than crawling out). While aligning the servo mounting holes through the chassis rail it proved to be the ideal tool to use as by levering things upwards slightly, and jiggling the whole shebang mildly, the process assisted getting the three mounting bolts back into place.     Had to use this emoji as the most appropriate considering the whole operation was done laying upside down!

Concerning the crappy easy alignment hose now commonly used by plumbers: I became aware of their dubious quality when a friend had one fail while he was away on holiday . . . he returned to a house full of water sodden carpets that had to be replaced!  

Personally I hadn't realised there was one up there on my roof, until now, but at $6.95 was cheap to replace. Maybe I will outlive the replacement OR get an off-spring to get up there next time!?  

Another step closer. 
viewing pics on my phone is tricky being small. 
Yep we are right at the top of the Spencer Gulf in Port Augusta or ad Dee often refers to it ad Porta Gutta mate. Next stop is Quorn over Easter then down to the furthest west we are travelling to Whyalla. For me this is where i will examine the carbon arc welding that Dad n his brother did on the deck of HMAS Whyalla out front of the museum. Then to cover every inch of the Yorke Peninsula.
Sorry to high Jack your great post with my dribble

AGGHHHH!!!!! 

Same old same yet again!  Only things left now are the rear slave cylinders and checking out the brake mechanisms & bisectors.

Like it or not wheels, axles, and drums are going to have to come off now.    Well not now, other things to be done elsewhere, Wednesday probably!

I'm starting to hate this truck . . .