Derbi Sonar

Brake fluid capacity & service interval

Derbi Sonar brake fluid capacity ranges between min and max. Service intervals require a change every 24 months. The data covers 3 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
Sonar 125 4T (2010-2012)
  • Use: Normal
  • Between min and max.
  • Change 24 months
Sonar 150 4T (2010-2012)
  • Use: Normal
  • Between min and max.
  • Change 24 months
Sonar 50 2T (2010-2012)
  • Use: Normal
  • Between min and max.
  • Change 24 months

Additional Notes

  • The Derbi Sonar brake fluid capacity is expressed as a range rather than a fixed volume, with the reservoir to be filled between the minimum and maximum marks on the reservoir itself.
  • A 24-month change interval applies to the hydraulic brake system across all three Sonar variants covered for 2010-2012, meaning the fluid is replaced on a time-based schedule rather than a mileage or distance basis.
  • The 125 4T, 150 4T, and 50 2T variants all share the same brake fluid service interval of 24 months under normal use conditions.
  • The min-to-max fill specification is consistent across the 125 4T, 150 4T, and 50 2T, indicating no displacement-based variation in how the hydraulic brake reservoir is serviced.
  • All three Sonar configurations carry the hydraulic brake system designation, which refers to a fluid-actuated braking mechanism where fluid condition directly affects system performance over time, hence the periodic replacement interval.
  • The 24-month interval applies under normal use conditions, as specified for each of the three Sonar variants across the 2010-2012 model years.