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My 1978 R100S came with a rear disc brake from the factory. Of course it had snowflakes.
In any event, I'd think it doubtful there was ever an "aftermarket" rear disc brake, save of course for the rotor itself. Maybe somebody cobbled on a Honda part or something, but it seems more likely you have BMW parts.
You'll fix what you have with advice above, but the best advice is to convert to rear drum brake, as the Airhead rear disc brake was and always will be more trouble than it's worth.
I do recall seeing a Smoke Silver R 90S at the Johnson City national that had an after market rear disc and spoked wheels. The bike had a number of very nice period correct upgrades like large oil pan and Hella spot lights. Unfortunately I didn't pay attention to the details of the rear brakes.
he was more of a typical Airhead owner who bask in the glory
My 1978 R100S came with a rear disc brake from the factory. Of course it had snowflakes.
In any event, I'd think it doubtful there was ever an "aftermarket" rear disc brake, save of course for the rotor itself. Maybe somebody cobbled on a Honda part or something, but it seems more likely you have BMW parts.
You'll fix what you have with advice above, but the best advice is to convert to rear drum brake, as the Airhead rear disc brake was and always will be more trouble than it's worth.
We "bask"? I didn't know that...some kind of aura or something??