What to know
- Brake fluid is a hydraulic fluid that transmits pressure from the brake pedal to the brake calipers, which then squeeze the brake pads against the rotors.
- Connect the tubing from the bleeder bottle to the bleeder valve on the brake caliper.
- It is crucial to bleed the brakes in the correct order, starting with the furthest wheel from the master cylinder and working towards the closest.
Maintaining your brakes is crucial for safe driving. One important aspect of brake maintenance is flushing the brake master cylinder. This process removes old brake fluid, which can become contaminated and affect braking performance. Knowing how to flush brake master cylinder can save you money and keep you safe on the road.
Why Flush Your Brake Master Cylinder?
Brake fluid is a hydraulic fluid that transmits pressure from the brake pedal to the brake calipers, which then squeeze the brake pads against the rotors. Over time, brake fluid can absorb moisture from the air, leading to:
- Reduced braking performance: Contaminated brake fluid can cause a spongy brake pedal, making it harder to stop the vehicle.
- Corrosion: Moisture in the brake fluid can corrode internal components of the brake system, leading to leaks and malfunctions.
- Boiling point decrease: Contaminated brake fluid has a lower boiling point, increasing the risk of brake fade, especially during heavy braking.
Gather Your Supplies
Before you begin flushing your brake master cylinder, make sure you have the following supplies:
- New brake fluid: Choose a brake fluid that meets the specifications for your vehicle.
- Brake fluid bleeder kit: This kit includes a bleeder bottle, tubing, and a wrench to open the bleeder valves.
- Clean rags: To catch any spills and for cleaning.
- Container: To catch the old brake fluid.
- Socket wrench: To remove the brake master cylinder reservoir cap.
- Safety glasses: To protect your eyes from splashes.
Step-by-Step Guide to Flushing Your Brake Master Cylinder
Now that you have all the necessary supplies, it’s time to flush the brake master cylinder. This process involves removing the old brake fluid and replacing it with fresh fluid. Here’s how to do it:
1. Park on a Level Surface and Engage the Parking Brake
Ensure your vehicle is parked on a level surface and engage the parking brake. This will prevent the vehicle from rolling while you are working on the brakes.
2. Locate the Brake Master Cylinder Reservoir
The brake master cylinder reservoir is typically located under the hood, near the firewall. It will be a small, cylindrical container with a cap.
3. Remove the Reservoir Cap
Use your socket wrench to remove the reservoir cap. Be careful not to drop the cap, as it can get lost easily.
4. Inspect the Fluid Level
Check the fluid level in the reservoir. If it is low, add new brake fluid until it reaches the “Full” mark.
5. Connect the Bleeder Kit
Attach the bleeder bottle to the bleeder kit and fill it with new brake fluid. Connect the tubing from the bleeder bottle to the bleeder valve on the brake caliper.
6. Open the Bleeder Valve
Have an assistant pump the brake pedal several times to pressurize the brake system. Then, open the bleeder valve slightly. You should see fresh brake fluid flowing out of the bleeder valve and into the bleeder bottle.
7. Close the Bleeder Valve and Repeat
Close the bleeder valve once the fresh fluid starts flowing without any air bubbles. Repeat steps 6 and 7 for each wheel, starting with the furthest wheel from the master cylinder and working towards the closest.
8. Refill the Master Cylinder Reservoir
As you bleed the brakes, the fluid level in the master cylinder reservoir will drop. Continuously add new brake fluid to maintain the “Full” mark.
9. Check for Leaks
Once you have bled all four wheels, check for any leaks in the brake system. If you see any leaks, tighten the bleeder valve or replace the damaged component.
10. Test Drive and Refill as Needed
After you are confident that the brake system is leak-free, take your vehicle for a test drive. If the brake pedal feels spongy or the brakes are not working properly, repeat the bleeding process or consult a mechanic.
Important Considerations
- Type of Brake Fluid: Using the wrong type of brake fluid can damage your brake system. Always consult your owner’s manual for the recommended brake fluid type.
- Bleeding Order: It is crucial to bleed the brakes in the correct order, starting with the furthest wheel from the master cylinder and working towards the closest. This ensures that air is purged from the system effectively.
- Safety: Wear safety glasses to protect your eyes from splashes. Brake fluid can be corrosive and should be handled with care.
- Professional Assistance: If you are unsure about any part of the process, it is best to consult a professional mechanic.
The End of the Road: A Smooth Ride Ahead
By following these steps, you can effectively flush your brake master cylinder and ensure optimal braking performance. Remember to check your brake fluid level regularly and flush the system every two years or as recommended by your vehicle manufacturer.
What You Need to Learn
Q: How often should I flush my brake master cylinder?
A: It is generally recommended to flush your brake master cylinder every two years or as recommended by your vehicle manufacturer. However, if you notice any signs of brake fluid contamination, such as a spongy brake pedal or brake fade, you should flush the system immediately.
Q: Can I use brake fluid from a different car?
A: No, you should only use brake fluid that is compatible with your vehicle. Refer to your owner’s manual or consult a mechanic to determine the correct type of brake fluid for your car.
Q: What happens if I don’t flush my brake master cylinder?
A: If you don’t flush your brake master cylinder, the brake fluid can become contaminated and affect the braking performance. This can lead to a spongy brake pedal, brake fade, and even brake failure.
Q: Can I flush my brake master cylinder myself?
A: While flushing the brake master cylinder is a relatively simple task, it requires some mechanical knowledge and the right tools. If you are not comfortable working on your vehicle, it is best to consult a professional mechanic.
Q: Is it safe to drive with a low brake fluid level?
A: No, it is not safe to drive with a low brake fluid level. Low brake fluid can lead to a loss of braking performance and even brake failure. If you notice that your brake fluid level is low, you should top it off immediately and have your brake system inspected by a mechanic.