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We report the discovery of a new eclipsing system less than one arcminutesouth of the pulsating DB white dwarf KUV 05134+2605. The object could beidentified with the point source 2MASSJ0516288+260738 published by the TwoMicron All Sky Survey. We present and discuss the first light curves as well assome additional colour and spectral information. The eclipse period of thesystem is 1.29d, and, assuming this to be identical to the orbital period, thebest light curve solution yields a mass ratio of m2/m1=0.11, a radius ratio ofr2/r1~1 and an inclination of 74 deg. The spectral anaylsis results in aTeff=4200K for the primary. On this basis, we suggest that the new systemprobably consists of a late K + Brown dwarf (which would imply a systemconsiderably younger than ~0.01 Gyr to have r2/r1~1), and outline possiblefuture observations.Comment: 15 pages, 9 figures, accepted for publication in  Astronomy&Astrophysics. Revised version: optimized formatting only, no other  change

2MASS J0516288+260738: Discovery of the first eclipsing late K + Brown dwarf binary system?