Actually, servicing all the fluids on a regular basis is a good idea.
Brake fluid absorbs moisture from the air. So over time the brake fuid becomes contaminated with water. This then causes corrosion in the brake components. This corrosion can reach a point where brake components leak or fail to function correctly. So now the brake components require replacing along with changing the brake fluid. So replacing the brake fluid every three years is good vehicle maintenance, and prevents premature component failure.
Tester