"Oil" on the discs is a bad thing, even if you clean it off. It's most likely contaminated the brake pads, and regardless of whether the "oil" leak has been fixed or not, the pads are probably now shot.

You need to trace the source of the "oil". It could be a damaged/leaking fork seal (fork oil), or a damaged/worn caliper seal (brake fluid - it can look a little like oil) which is much more serious!

The uneffectiveness of either front or rear brake system can be due to other factors too if a bike is stood for a long time. Brake fluid is hydroscopic, meaning it absorbs moisture from the air over time, and this is why it should be changed at least once a year. The seals in the calipers and the master cylinders can perish too, especially if the dust covers are worn or damaged.

Without doubt the single most important part of the bike is the braking system. Any faults shoud be addressed before attempting to ride the bike again, even if it means replacing the master cylinders, calipers, pads, hoeses, or even discs.
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Andy.
NSR-WORLD.COM

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