FIRST CARS FOR IRT MADE BY JAPANESE FAIL 30-DAY TESTS
The New York City Transit Authority said yesterday that its new Japanese subway cars had failed their first two performance tests because of minor problems with brakes and door switches. The authority had hoped to have 325 of the cars running on the IRT Lexington Avenue line by the spring of 1985, but transit officials said they now considered this ''extremely optimistic.'' ''A four-to-six-month delay wouldn't surprise me in the least,'' the authority's senior vice president for operations, David F. Feeley, said. To Continue Using Old Cars The delay will mean the authority will continue using its present IRT cars, some of which were built in the late 40's.