1 Why flush and replace brake fluid?

Brake fluid is a hygroscopic fluid, which means it attracts and absorbs water from the air. This lowers its boiling point and makes it more prone to vaporization, which can cause a spongy or soft brake pedal. Water can also corrode the metal parts of the braking system, leading to leaks, rust, and damage. Flushing and replacing your brake fluid removes the old, contaminated fluid and replaces it with fresh, clean fluid that meets the specifications of your car's manufacturer. This improves the braking performance, extends the life of the components, and prevents costly repairs.

2 When to flush and replace brake fluid?

The frequency of flushing and replacing your brake fluid depends on various factors, such as the type and quality of the fluid, the driving conditions, the mileage, and the manufacturer's recommendations. As a general rule, you should check the condition and level of your brake fluid at least once a year or every 10,000 miles. To measure the moisture content and color of the fluid, you can use a brake fluid tester. If the fluid is dark, cloudy, or has more than 3% water, it's time to flush and replace it. Poor braking performance or longer stopping distances, a soft or low brake pedal, a burning smell or smoke from the brakes, a brake warning light on the dashboard and leaks or stains under the car are all signs that your brake fluid needs attention.

3 How to flush and replace brake fluid?

Flushing and replacing your brake fluid is a relatively simple but messy procedure that requires some tools, equipment, and safety precautions. You'll need a brake bleeder kit or a clear hose and a container, a wrench or socket that fits the bleeder valves on the calipers, a new bottle of brake fluid that matches the type and grade of your car's system, a jack and jack stands or ramps to lift the car, and a friend or helper to assist you. The basic steps are to lift the car and secure it with jack stands or ramps; remove the wheels to access the calipers; locate the bleeder valves on the calipers and attach the bleeder kit or hose to them; open the hood and remove the cap from the brake fluid reservoir; fill the reservoir with new brake fluid; ask your friend or helper to pump the brake pedal several times and then hold it down; loosen the bleeder valve on the caliper furthest from the master cylinder (usually the rear right) and let the old fluid drain into the container; tighten the valve when the fluid runs clear or no air bubbles come out; repeat for other calipers in following order: rear left, front right, front left; check brake fluid level in reservoir and top it up if needed; replace cap on reservoir and wheels on car; lower car and test brakes.

4 What to do after flushing and replacing brake fluid?

After flushing and replacing your brake fluid, you should dispose of the old fluid properly, as it is toxic and harmful to the environment. You can take it to a local auto shop or recycling center that accepts brake fluid, or contact your local waste management authority for guidance. You should also check for any leaks, tighten any loose connections, and clean any spills or stains from the car or the ground. Finally, you should drive carefully and gently for the first few miles, as the new fluid may need some time to settle and circulate in the system.

5 What are the benefits of flushing and replacing brake fluid?

Flushing and replacing your brake fluid regularly can be beneficial for your car and safety, improving braking performance and responsiveness, preventing vapor lock and brake fade, and reducing the risk of corrosion, leaks, and damage. It can also extend the life of brake pads, rotors, calipers, and hoses, saving money on repairs and maintenance. In addition, it can help enhance your driving confidence and peace of mind.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?