Something is shorting to earth on the brake lights.
Get a pack of fuses.
Remove left side bulb. Brake, does is blow the fuse?
Remove right side bulb. Brake, does it blow the fuse?
If yes to the above, it is the light fitting or wiring rubbed through to that light.
If no, it is the switch or wiring to the switch on the brake pedal.
https://www.google.com/search?q=4010+4x4+diesel+mule+blows+fuse
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