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“Dragging brakes” is a term that refers to brakes that remain partially applied even though pressure is not being exerted on the brake pedal. One of the likely causes of dragging brakes is contaminated brake fluid, which usually occurs as a result of openings around rubber seals or tiny breaks in flexible brake hoses that allow moisture to mix with brake fluid.
This is a potentially damaging scenario because brake fluid is highly “hygroscopic,” meaning it absorbs moisture from the atmosphere. When this occurs, brake fluid breaks down, and its ability to prevent corrosion is compromised, along with its boiling point and lubricating properties. To avoid these problems, brake fluid should be replaced at regular intervals (about every two years).
TIP: A lowered boiling point in brake fluid caused by contamination can result in a serious loss of braking power during repeated quick stops or prolonged braking on steep descending grades.
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