Guidelines for brake fluid replacement

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Fig 1: Brake Fluid And Reservoir

Courtesy of VOLVO CARS OF NORTH AMERICA.

It is recommended that the brake fluid is replaced every 45,000 km (30,000 miles), or every other year. The fluid must be replaced annually on cars driven in conditions requiring hard and frequent braking, such as driving in mountains or tropical climates with high humidity.

Background

The oil must be replaced because it is hygroscopic (the fluid absorbs water molecules from the air). This absorption of water occurs through the brake hoses and brake fluid reservoir. These components are rubber and plastic respectively and are not completely sealed against water molecules. An increased water content in the brake fluid dramatically reduces its boiling point and causes corrosion in the brake system components. This results in damage to the brake system. Braking performance deteriorates markedly.

NOTE: Use only Volvo Genuine Parts brake fluid (Volvo DOT 4+). Never reuse brake fluid. Always keep brake fluid well sealed in its original packaging.