How to Bleed Air Out of Your Car Brake System
Introduction
Air in your car’s brake system can cause a number of problems, including:
* Reduced braking power
* A spongy brake pedal
* Brake fade
* Increased stopping distances
If you think there may be air in your brake system, it’s important to bleed the system as soon as possible. Bleeding the brake system is a relatively simple procedure that can be done at home with a few basic tools.
Tools and Materials You’ll Need
* Brake fluid
* A brake bleeding kit (available at most auto parts stores)
* A clear hose (about 3 feet long)
* A wrench
* A clean rag
Step-by-Step Instructions
1. **Gather your tools and materials.** Make sure you have everything you need before you start.
2. **Park your car on a level surface.** Engage the parking brake.
3. **Open the hood and locate the brake master cylinder.** The master cylinder is typically located near the firewall of the engine compartment. It has a black cap with a brake fluid reservoir.
4. **Check the brake fluid level.** The fluid level should be between the “MIN” and “MAX” marks on the reservoir. If the fluid level is low, add brake fluid until it reaches the correct level.
5. **Attach the brake bleeding kit to the brake caliper.** The brake caliper is located at each wheel. It is the part that squeezes the brake pads against the brake rotors. The brake bleeding kit has a clear hose that will be attached to the brake caliper’s bleeder screw.
6. **Open the bleeder screw.** Use a wrench to loosen the bleeder screw. Brake fluid will start to flow out of the screw.
7. **Pump the brake pedal.** Have someone pump the brake pedal several times while you watch the brake fluid coming out of the bleeder screw. You will see air bubbles in the brake fluid.
8. **Close the bleeder screw.** Once you see that there are no more air bubbles in the brake fluid, close the bleeder screw.
9. **Repeat steps 6-8 for the other three wheels.**
10. **Check the brake fluid level again.** Top off the brake fluid if necessary.
11. **Test the brakes.** Drive your car around the block and test the brakes to make sure they are working properly.
Tips
* Use only new brake fluid. Do not reuse old brake fluid.
* Be careful not to overtighten the bleeder screws.
* If you have any questions, consult your car’s repair manual or a qualified mechanic.
Conclusion
Bleeding your car’s brake system is a simple procedure that can help to improve your braking performance and keep your car safe. By following these instructions, you can bleed the brake system yourself in about an hour.
