The Collaborative International Dictionary of English v.0.48:

Breste \Bres"te\, v. t. & i. [imp. Brast; p. p. Brusten,
   Borsten, Bursten.]
   To burst. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Brast \Brast\, v. t. & i. [See Burst.]
   To burst. [Obs.]
   [1913 Webster]

         And both his y["e]n braste out of his face. --Chaucer.
   [1913 Webster]

         Dreadfull furies which their chains have brast.
                                                  --Spenser.
   [1913 Webster]