Rear Brake problem KTM 1190 R

[quicksilver]

Fellow Dogs,

I recently embarked on a gravel trip through KZN and was returning via lower Lotheni Road when i noticed no rear brake slowing down in corners. If i pump rear brake, normal braking return for a few corners only. This only happens on gravel, not tar.

Any ideas please. I checked the brake fluid, level still fine. Seals or air in the brake line?

Thanks

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