KTM 990 Adv rear brake issue

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Dec 19, 2020
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AJS (all models)
Hi all. I’m in need of some advice, some insight from past experiences.

The rear brake on my dad’s KTM 990 adventure (2011) is spongy. Looking online there are several solutions that all point to weird places. Eg; the spyglass in the reservoir, the brake lines near the exhaust up in the rear fender arch.

Does anyone have a permanent fix that they’ve discovered and used successfully that I could implement on pa’s bike?

Thanks
 
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