There is a conversion kit using a Series II master cylinder at the bottom of this page Land Rover Series One Brake Parts Page 3
No damage to outrigger but allows the use of a more common master cylinder which could be changed to the LWB version. Showing 'out of stock' but all the parts could be made locally if required.
I would expect that using a SWB master cylinder would mean more travel to get the displacement needed to operate the LWB wheel cylinders but you should be able to get a firm pedal (if you haven't hit the floor first).
Do the brake shoes have full contact in the drums ? Had a similar problem and it was the shoes not matching the radius of the drums so the shoes were flexing. Chalked the shoes, refitted the drum & wheel, gently applied the brake and turned the wheel. When taken apart you could see the point of contact so carefully filed down the shoes and re-checked until the contact area was about 75%. Problem solved.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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