Thank you, Peter.
1 1/8 rear wheel cylinders are ideal if you have standard drum brakes all round, but not if discs are fitted to the front. More efficient front brakes transfer much more load to the front wheels under heavy braking. The nose of the car dips and the rear lifts. If too much braking effort is applied to the rear brakes the rear wheels are far more likely to skid.
I had an excellent practical demonstration of this years ago when I first bought my 403 with front discs. I fitted new brake parts all round including 1 1/8" cylinders on the rear per the motor factor's look up. A couple of days later I met a tractor coming towards me on a narrow country lane. The back end of the car made a spirited bid to overtake me but I managed to straighten up in time. The change to 1" cylinders made all the difference.
I have no experience with servo assisted twin leading shoe front conversions but these may well have a similar issue although not so severe.
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