How to Empty Brake Fluid in Under 10 Minutes

Learning how to empty brake fluid is a crucial skill for any car enthusiast or DIY mechanic. While regular brake fluid changes are vital for maintaining optimal braking performance, sometimes you need to completely flush the system. This could be necessary due to contamination, a system rebuild, or simply a desire to start fresh. This guide will walk you through the process step-by-step, equipping you with the knowledge and confidence to safely empty your brake fluid.

Why Empty Brake Fluid?

Before diving into the process, let’s understand why emptying brake fluid is sometimes necessary.

• Contamination: Brake fluid absorbs moisture over time, which can lead to corrosion and reduced boiling point. This can compromise braking performance and even lead to brake failure.
• System Rebuild: When rebuilding brake calipers, replacing brake lines, or performing other major brake system work, it’s essential to flush the old fluid to prevent contamination from the old parts.
• Fluid Degradation: Brake fluid breaks down over time, losing its effectiveness and becoming less efficient in transferring hydraulic pressure.
• Air in the System: Air bubbles in the brake lines can cause a spongy brake pedal and reduced braking power. Emptying and refilling the system can help eliminate air from the lines.

Safety First: Essential Precautions

Working with brake fluid requires caution. It’s a corrosive substance that can damage paint and skin. Here are some safety precautions to follow:

• Wear Protective Gear: Always wear safety glasses, gloves, and old clothes to protect yourself from spills.
• Work in a Well-Ventilated Area: Brake fluid fumes can be harmful, so work in a well-ventilated area or outdoors.
• Avoid Contact with Skin: If brake fluid gets on your skin, wash it off immediately with soap and water.
• Proper Disposal: Dispose of used brake fluid responsibly. Check with your local waste disposal authorities for proper handling instructions.

Gather Your Tools and Supplies

Before you start, ensure you have the following tools and supplies on hand:

• New Brake Fluid: Purchase enough new brake fluid compatible with your vehicle’s brake system. Consult your owner’s manual or a reputable parts store for the correct type.
• Brake Fluid Bleeder: This tool helps remove air from the brake lines. You can find them at most auto parts stores.
• Wrench Set: You’ll need wrenches to loosen and tighten brake lines and bleeder screws.
• Container for Old Fluid: Use a clear container to collect the used brake fluid.
• Clean Rags: Have plenty of clean rags on hand for wiping spills and cleaning tools.
• Jack and Stands: If you’re working on the rear brakes, you’ll need a jack and stands to safely raise the vehicle.

Step-by-Step Guide to Emptying Brake Fluid

Now, let’s walk through the process of emptying brake fluid:

1. Park the Vehicle on a Level Surface: Ensure the vehicle is parked on a level surface and engage the parking brake.
2. Locate the Brake Fluid Reservoir: Open the hood of your vehicle and locate the brake fluid reservoir. It’s typically a small, clear container with a cap.
3. Remove the Brake Fluid Reservoir Cap: Carefully remove the brake fluid reservoir cap.
4. Prepare the Bleeder Screws: Locate the bleeder screws on each brake caliper. These are typically small, hexagonal-shaped screws located on the top or side of the caliper.
5. Attach the Bleeder Hose: Connect the brake fluid bleeder hose to the bleeder screw on one of the brake calipers.
6. Open the Bleeder Screw: With the bleeder hose attached, carefully open the bleeder screw.
7. Pump the Brake Pedal: While someone pumps the brake pedal, slowly open the bleeder screw. This will allow the old brake fluid to flow out of the system.
8. Catch the Old Fluid: Ensure the hose is directed into the container to collect the old brake fluid.
9. Repeat for Each Caliper: Repeat steps 5-8 for each brake caliper, starting with the caliper farthest from the master cylinder.
10. Refill the Reservoir: As the old fluid is drained, keep the brake fluid reservoir topped off with new fluid. This will prevent air from entering the system.
11. Check for Air Bubbles: As the old fluid is drained, look for air bubbles in the bleeder hose. If you see air bubbles, continue pumping the brake pedal until the fluid runs clear.
12. Tighten the Bleeder Screws: Once the fluid runs clear, carefully tighten the bleeder screws.
13. Test the Brakes: After emptying the brake fluid, test the brakes by pressing the pedal firmly. The pedal should feel firm and responsive.
14. Check Fluid Level: After testing the brakes, check the fluid level in the brake fluid reservoir and top it off if necessary.

Important Tips and Considerations

• Use a Pressure Bleeder: For a faster and more efficient brake fluid flush, consider using a pressure bleeder. This tool pressurizes the brake fluid reservoir, forcing the old fluid out of the system.
• Avoid Over-Tightening: Be careful not to over-tighten the bleeder screws, as this can damage the threads.
• Keep the Reservoir Full: Always keep the brake fluid reservoir topped off with new fluid during the process.
• Avoid Contamination: Keep the brake fluid reservoir cap clean and free of debris to prevent contamination.
• Seek Professional Help: If you’re uncomfortable performing this procedure, it’s always best to seek professional help from a qualified mechanic.

Final Thoughts: A Well-Braked Journey

Emptying brake fluid is a critical maintenance task that ensures optimal braking performance and safety. By following these steps and taking the necessary precautions, you can confidently flush your brake fluid and keep your vehicle’s braking system in top condition. Remember to always prioritize safety and seek professional help if you have any doubts or concerns.

What People Want to Know

Q: How often should I change my brake fluid?

A: Most manufacturers recommend changing brake fluid every two to three years or 30,000 miles. However, it’s best to check your owner’s manual for specific recommendations.

Q: Can I use any type of brake fluid?

A: No, it’s crucial to use the correct type of brake fluid for your vehicle. Consult your owner’s manual or a reputable parts store for the recommended type.

Q: What happens if I don’t empty my brake fluid?

A: Failing to empty your brake fluid can lead to various problems, including:

• Reduced Braking Performance: Contaminated brake fluid can reduce the effectiveness of your brakes.
• Corrosion: Moisture in the brake fluid can cause corrosion in the brake lines and calipers.
• Brake Failure: In severe cases, contaminated brake fluid can lead to brake failure.

Q: Is it difficult to empty brake fluid?

A: While emptying brake fluid requires some mechanical skills, it’s not an overly difficult task. With the right tools and knowledge, you can successfully complete the process.

Q: Can I empty my brake fluid myself?

A: You can empty your brake fluid yourself if you’re comfortable working on your vehicle and have the necessary tools and knowledge. However, if you’re not confident in your abilities, it’s best to seek professional help.