Brake Fluid: Service and Repair
Brake fluid, changingNote: The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.
Guidelines and background
Guidelines for brake fluid replacemen
It is recommended that the brake fluid is replaced every 45000 km (30000 miles) or every other year. The fluid must be replaced annually on vehicles driven in conditions requiring hard and frequent braking, such as alpine driving or driving in 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 designated DOT 4+. Never reuse brake fluid. Always keep the brake fluid sealed in the original packaging.
Note: Continually check that there is sufficient brake fluid in the brake fluid reservoir when changing brake fluid.
Preparatory work
Switch off the ignition. Remove all four wheels.
Replacement
Changing the brake fluid, front
Remove the protective cap from the bleed nipple. Install a plastic hose on the nipple. Open the bleed nipple. Collect the brake fluid in a container. Press the brake caliper piston to the bottom of the caliper. Use G-clamp as illustrated. Leave the G-clamp in pushed in position.
Alternative 1:
Connect the bleeding unit. See: Brake system bleeding with bleeding unit Open the bleed nipple on the caliper. Wait until there is new oil in the plastic hose. Close the bleed nipple
Alternative 2:
Press down the brake pedal to the limit position. Keep it pressed down for approximately 2 seconds before releasing it. Repeat until there is new brake fluid in the plastic hose. Close the bleed nipple when the brake pedal is fully depressed. Remove the hose. Install the protective cap. Remove the G-clamp from the brake caliper. Repeat the process on the other front wheel. Install the wheel.
Replacing brake fluid, rear
Remove the brake caliper. See: Brake pads rear, replacing. Press the piston into the brake caliper. Use: 9995782 replace 5782-1 with: 999 7091 Remove the protective cap from the bleed nipple. Install the plastic hose on the nipple. Open the bleed nipple. Collect the brake fluid in a container.
Alternative 1:
Connect the bleeding unit. See Brake system bleeding with bleeding unit Open the bleed nipple on the caliper. Wait until there is new oil in the plastic hose. Close the bleed nipple.
Alternative 2:
Press down the brake pedal to the limit position. Keep it pressed down for approximately 2 seconds before releasing it. Repeat until there is new brake fluid in the plastic hose. Close the bleed nipple when the brake pedal is fully depressed. Remove the hose. Install the protective cap. Remove the tool. Install the brake caliper. See: Brake pads rear, replacing. Repeat the process on the other rear wheel. Install the wheel.