While not as common as the brass quintet, the brass quartet has a few pieces of repertoire that works pretty well for the instrumentation. It is essentially a brass quintet without the second trumpet.
This piece is a work called Solarium and it is scored for brass quartet and piano. It is an exciting piece of new music with the performance taking place at a collaborative piano recital at Arizona State University (ASU) in 2010. There is a lot of emphasis on the piano in this piece, with the quartet acting as more of an accompaniment than a solo group. The performance itself is quite good and the recording quality is not bad either. It would definitely be a fun piece of music to add to a recital assuming you have the skilled performers necessary to pull this work off, as it seems quite challenging.