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These lights usually come on anytime the battery fails. I would recommend having the battery replaced or tested and while the battery is out touch the postivie and negative battery cables togther for about 30 secs. before reconnecting the cables to the new battery..this will usually clear the faults.
If the lights do not go out about the only thing you should know is that you may not have any ABS braking which could be a problem if you are driving in snow or ice. Otherwise the brakes are fine and wont cause any problems except for the lack of ABS brakes
I hope that helps you get on with your holiday