If A Component Fails - Honda TRX300EX Owner's Manual

The brake levers or pedal, control cables, and other components can be
damaged as you ride in dense brush or over rocky terrain. Making a
trailside repair depends on how serious the damage is and what tools and
supplies you have with you.
If any component of the brake system is damaged, you may be able to
ride carefully back to your base using the other brake components for
slowing or stopping.
If you damage a throttle cable or other critical component, your ATV
may be unsafe to ride. Carefully assess the damage and make any
repairs that you can. But if there is any doubt, it's best to be
conservative and safe.

If a Component Fails

Taking Care of the Unexpected
177