KTM 390 Duke
Brake fluid capacity & service interval
KTM 390 Duke brake fluid capacity ranges between min and max. Service intervals occur every 15000 km or 24 months. The data covers 5 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| 390 Duke (2019-2023) |
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| 390 Duke (2018-2018) |
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| 390 Duke (2015-2017) |
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| 390 Duke (2014-2014) |
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| 390 Duke (2013-2013) |
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Additional Notes
- The KTM 390 Duke hydraulic brake system does not carry a fixed fluid volume figure. Instead, the specification calls for a level maintained between the minimum and maximum marks on the reservoir, which is standard practice for hydraulic brake circuits where the exact fill quantity varies with pad wear and system condition.
- Across all model years from 2013-2023, the brake fluid change interval is consistent at 15,000 km or 24 months, whichever comes first. The time-based element of this interval reflects the hygroscopic nature of brake fluid, which absorbs moisture from the atmosphere over time and lowers its boiling point regardless of mileage accumulated.
- The 24-month calendar limit means a low-mileage machine still requires fluid renewal on a two-year cycle. Brake fluid degradation is driven by moisture absorption as much as by heat cycling, so calendar time carries equal weight to distance in the service interval.
- All specifications across 2013-2023 are designated for normal use conditions. No separate severe-use interval is listed for the brake fluid system, distinguishing it from drivetrain fluids that commonly carry shortened intervals under hard-use conditions.
- The specifications for 2013, 2014, 2015-2017, 2018, and 2019-2023 are identical in both the level-based fill method and the 15,000 km/24-month change interval, indicating no revision to brake fluid service requirements across the full model range covered.