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The North County Transit District (NCTD) has ordered a complete set of split disc rotors for its entire Sprinter fleet.

The California Public Utilities Commission (CPUC) found irregular wear patterns on the non-powered center axles during an inspection in late February. NCTD then took the Sprinter out of service March 9.

Earlier this week, the agency began testing one set of the split disc rotors to determine if they are adequate substitutes for the original rotors that are showing premature and irregular wear, NCTD officials said in a press release.

Kovis D.O.O. of Slovenia is producing the split discs. This week's order includes discs for all 12 vehicles in the fleet, as well as spares. In total, NCTD plans to have 130 split discs in stock, as well as 96 to outfit the Sprinter fleet and 34 spares, agency officials said.

NCTD, its contractor Veolia and subcontractor Bombardier Transportation began the process with brake testing on one Sprinter vehicle. The Federal Railroad Administration and CPUC are observing the tests, which are taking place on the rail line between Escondido and San Marcos.

Overall, 124 tests will be conducted over a 24-day period. NCTD expects to announce a Sprinter service restoration date after it receives the complete set of rotors, agency officials said.