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Even though this should not be reason for concern, you should still return your car to the shop, to be on the safe side. Generally speaking, you should always take your car in for brake repair as soon as you notice any of these warning signs, before the situation gets any worse. You'll be glad you did! Be sure to have your brake fluid inspected on a regular basis, as well. Fluid can be contaminated by moisture and metal flakes that will interfere with proper brake function. Contaminated brake fluid generally results in the need for caliper and wheel cylinder replacement.