I am converting the rear brake to Twin Leading Shoe (TLS) on my A10 Golden Flash. I have just taken the rear brake Cross Shaft Lever 42-4530 (other end of the shaft to the brake pedal) and my engineer asked whether it was iron or steel. I assumed steel, does anyone know?
I would not have thought fitting a TLS kit onto a rear brake is a good idea, it is the front brake which provides the most effective braking and because of the weight transfer that takes place under braking the rear wheel will have a tendency to lock up if utmost care is not exercised! I, and many other riders I am sure, never normally employ the rear brake other than when the front brake is weak and a rapid slowing down is required, (Ariel hubs etc) Another aspect might be that stopping on a hill whilst heading upwards could be problematic as (assuming you already have a TLS set up on your front hub), you would have to rely on four trailing shoes to halt down hill progress which could be interesting. My comments assume you already have TLS on your front brake. If you take the modern superbike as an example, they normally have enormous twin discs on the front of the bike and, comparatively speaking, a much reduced diameter rear brake for the same reasons!