You need to modify the UV coords of the desired face.
This could be done in blender if you're using that to make the brick, or it could be done via a text editor.
See the
BLB Brick Format Reference
To repeat a texture four times, instead of:
UV COORDS:
0 0
0 1
1 1
1 0
You would do:
UV COORDS:
0 0
0 4
4 4
4 0
Or something similar.
I don't remember how to do this in Blender, but if you can get the texture to repeat in Blender, it should export that way.