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Picture of How to Flush Brake Fluid Using a Pressure Bleeder

Tutorial on how to flush your vehicle’s brake fluid using a pressure bleeder. Here I am working with a 2007 Volvo C30. There is usually specific maintenance intervals for brake fluid and this information can be found in your vehicle’s owner’s manual. Some vehicles may require a replacement at every 30,000km/20,000 miles or every 2 years. Other vehicles may have a longer maintenance interval such as 160,000km/100,000 miles or every 10 years. Brake is a type of oil that is hygroscopic, meaning it’s able to absorb moisture which is present in the air, either through leaks, seals, or even when the cap is off the reservoir. Each type of brake fluid has a boiling point rating and each is effected differently based on moisture content. Excessive moisture can cause premature failure of components, as well as poor braking performance. Heat can break down the fluid, including these additives which will cause poor braking performance and even premature failure of components. Old fluid can also cause a spongy pedal feel and increase the chance of brake fade under heavier braking.

Tools/Supplies Needed:

  • wrenches
  • about 10 inches of clear rubber hose
  • clean rags
  • brake fluid
  • pressure bleeder
  • vacuum pump or turkey baster
  • jack
  • jack stand
  • wheel wrench

Step 1: Fluid Requirements

Picture of Fluid Requirements
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Start by opening the hood and locating your master cylinder reservoir. Use a clean rag to wipe the surrounding area of the cap to prevent any foreign contaminants entering the reservoir.

In order to determine which type of fluid is required for your vehicle, this can be printed on the top of the reservoir cap. You can also refer to your vehicle’s owner’s manual under a fluid type of capacity section. Along with type, we’ll need to know the capacity required for the vehicle. You should have about 0.5L more of brake fluid, for this vehicle is requires 0.6L and I have 1L which should be plenty.

In the last photo, you can also see the comparison between the old and new fluid.