Optimize Your Braking Performance: Bleed Brembo Brakes on Subaru STI
Table of Contents
- Introduction
- Tools and Equipment Needed
- Checking the Brake Fluid Level
- Starting with the Caliper Furthest from the Master Cylinder
- Bleeding the Inner Caliper
- Bleeding the Outer Caliper
- Moving to the Opposite Side
- Bleeding the Brake Calipers on the Other Side
- Final Steps and Safety Precautions
- Conclusion
Introduction
In this article, we will guide you through the process of bleeding the brakes on a STI. Properly bleeding the brakes is an essential maintenance task that ensures optimal braking performance and prevents air bubbles from interfering with the brake system. We will provide step-by-step instructions and tips to make the process easier and more efficient. So, let's get started and ensure your brakes are in top-notch condition!
Tools and Equipment Needed
Before we begin, let's gather all the necessary tools and equipment for this brake bleeding job. Here's what you will need:
- 11 mm wrench or a 7/16 spanner
- Large ratchet with a short extension
- Screwdriver for opening the rubber caps on the bleed nipples
- Safety glasses
- New brake fluid compatible with your vehicle's specifications (usually DOT 4.5)
- Clear hose or a vacuum hose (optional)
- Brake bleed bottle or a suitable container
- Rag or cloth for cleaning up any spilled brake fluid
It is important to have these tools and equipment readily available to ensure a smooth brake bleeding process.
Checking the Brake Fluid Level
Before starting the brake bleeding procedure, it is crucial to check the brake fluid level in the master cylinder reservoir. Make sure the fluid level is below the maximum line. If it's low, top it up with the appropriate brake fluid for your vehicle. Remember to consult the owner's manual for the correct brake fluid type.
Starting with the Caliper Furthest from the Master Cylinder
To begin bleeding the brakes, we will start with the caliper that is furthest away from the master cylinder. In this case, it will be the left rear caliper for a right-hand drive car. This step is important as it allows us to properly remove any air trapped in the brake lines.
Bleeding the Inner Caliper
The calipers on the STI have two bleed nipples – one inner and one outer. It is essential to bleed the inner caliper first. Here's how to do it:
- Top up the brake fluid in the bleed bottle with the new brake fluid.
- Attach the 11 mm wrench or 7/16 spanner to the inner bleed nipple.
- Place the other end of the clear hose into the bleed bottle, making sure it is submerged in the brake fluid.
- Instruct your assistant to pump the brakes slowly while you observe the clear hose.
- As your assistant presses the brake pedal, gradually open the bleed nipple using the wrench or spanner.
- Watch the clear hose for any air bubbles or discolored fluid.
- Instruct your assistant to hold the brake pedal down.
- Close the bleed nipple tightly, and then let your assistant release the brake pedal.
- Repeat this process until you see clean fluid flowing without any air bubbles.
Bleeding the Outer Caliper
Once you have completed bleeding the inner caliper, move on to bleeding the outer caliper. Here's the step-by-step process:
- Position the 11 mm wrench or 7/16 spanner on the outer bleed nipple.
- Follow the same procedure as before – have your assistant pump the brakes slowly while you open the bleed nipple.
- Observe the clear hose for any air bubbles or discolored fluid.
- Instruct your assistant to hold the brake pedal down.
- Close the bleed nipple tightly and release the brake pedal.
- Continue this process until you achieve clean fluid without any air bubbles.
Moving to the Opposite Side
After bleeding both the inner and outer calipers on one side (in this case, the left side of the vehicle), it's time to move to the other side. Follow the same steps for bleeding the calipers on the opposite side.
Bleeding the Brake Calipers on the Other Side
Repeat the previous process for bleeding the brake calipers on the other side of the vehicle (the right side in the case of a right-hand drive car). Make sure to check the brake fluid level periodically and top it up as needed.
Final Steps and Safety Precautions
Once you have completed bleeding all the brake calipers, it is important to tighten all the bleed nipples to 20 Newton meters using a torque wrench. Be careful not to overtighten them, as it may cause damage.
Additionally, clean the area around the bleed nipples and any spilled brake fluid using a rag or cloth. It is crucial to promptly clean any spilled brake fluid, as it can damage your paintwork.
Conclusion
Bleeding the brakes is an essential maintenance task to ensure optimal braking performance and safety. By following the steps outlined in this article, you can effectively bleed the brakes on your STI. Remember to exercise caution, keep an eye on the brake fluid level, and use the appropriate tools and equipment. Properly maintained brakes play a vital role in the overall performance and safety of your vehicle. So, keep your brakes in top-notch condition and enjoy a smooth and safe driving experience!
Highlights
- Bleeding the brakes ensures optimal braking performance and prevents air bubbles.
- Use the appropriate tools and equipment for the brake bleeding job.
- Begin with the caliper furthest from the master cylinder and bleed the inner caliper first.
- Follow the same process for bleeding the outer caliper on each side.
- Tighten all bleed nipples to 20 Newton meters using a torque wrench.
- Promptly clean any spilled brake fluid to prevent damage.
FAQ
Q: How often should I bleed my car's brakes?
A: It is recommended to bleed your car's brakes every two to three years, or if you notice any signs of decreased brake performance.
Q: Can I use a vacuum bleeder instead of the two-man method?
A: Yes, a vacuum bleeder can be used as an alternative method for bleeding the brakes. However, the two-man method is commonly used and can be just as effective.
Q: What happens if I don't bleed my brakes?
A: If you neglect to bleed your brakes, air bubbles can become trapped in the brake lines, reducing the effectiveness of your brakes and compromising your safety on the road.
Q: Can I reuse the old brake fluid?
A: It is not recommended to reuse old brake fluid as it may contain contaminants and moisture that can affect the performance of your braking system. Always use fresh brake fluid.
Q: Is brake bleeding a difficult task?
A: Brake bleeding requires careful attention to detail, but with the proper tools and instructions, it can be done by most car owners. However, if you're unsure or uncomfortable, it's best to consult a professional mechanic.
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