Unlocking the Secrets of How to Put Brake Fluid in Bike: A Comprehensive Tutorial

Learning how to put brake fluid in your bike is a valuable skill for any motorcycle enthusiast. It’s a relatively simple procedure, but understanding the process and using the right tools is crucial to ensure your brakes function optimally and safely. This guide provides a detailed breakdown of how to put brake fluid in your bike, covering everything from the essential tools to the proper techniques.

Why is Brake Fluid Important?

Brake fluid is the lifeblood of your motorcycle’s braking system. It transmits the hydraulic pressure generated by the lever or pedal to the calipers, which then squeeze the brake pads against the rotor, bringing your bike to a stop. But brake fluid isn’t just any liquid; it’s specially formulated to withstand high temperatures and pressures, while also maintaining its viscosity and lubricating the system.

Over time, brake fluid can absorb moisture from the air, leading to a decrease in its boiling point. This can cause brake fade, where the brakes become less effective under heavy braking, potentially leading to dangerous situations. Therefore, regularly replacing brake fluid is vital for maintaining optimal brake performance.

Essential Tools for the Job

Before you embark on your brake fluid replacement journey, ensure you have the following tools:

• Brake fluid: Always use the type of brake fluid specified by your motorcycle’s manufacturer. Consult your owner’s manual or check the reservoir cap for the recommended type.
• Syringe: A syringe with a blunt tip is ideal for safely transferring brake fluid.
• Clean rag: Keep a clean rag handy for wiping spills and cleaning the reservoir.
• Funnel: A small funnel helps prevent spills when pouring brake fluid into the reservoir.
• Torque wrench: This is essential for tightening the bleed screw to the correct specifications.
• Open-ended wrench: You’ll need this to loosen and tighten the bleed screw.
• Small container: Use a small container to collect the old brake fluid.
• Protective gloves: Wear gloves to protect your hands from brake fluid, which can irritate the skin.
• Safety glasses: Always wear safety glasses to protect your eyes from any potential splashes.

The Step-by-Step Guide to Replacing Brake Fluid

Now, let’s dive into the step-by-step process of replacing brake fluid in your bike:

1. Prepare your workspace: Find a clean and well-lit area to work. Ensure you have all the necessary tools within reach.
2. Locate the brake fluid reservoir: The reservoir is typically located near the handlebars or under the seat. It should be clearly labeled and have a cap that can be removed.
3. Check the fluid level: Before you start, check the fluid level in the reservoir. If it’s low, top it off with the correct type of brake fluid.
4. Clean the reservoir: Use a clean rag to wipe down the reservoir and surrounding area, removing any dirt or debris.
5. Remove the reservoir cap: Carefully remove the reservoir cap and set it aside.
6. Locate the bleed screw: The bleed screw is located on the caliper, usually at the top or side. It’s a small screw with a hole in the center.
7. Attach the hose: Connect a clear hose to the bleed screw. The other end of the hose should be placed in a small container to collect the old brake fluid.
8. Open the bleed screw: Using the open-ended wrench, carefully open the bleed screw about half a turn.
9. Pump the brake lever: With the bleed screw open, pump the brake lever several times to push the old fluid through the system.
10. Add new fluid: While pumping the brake lever, slowly add new brake fluid to the reservoir using the funnel and syringe. Make sure to keep the reservoir full at all times.
11. Close the bleed screw: Once you see fresh, clean fluid coming out of the hose, close the bleed screw tightly using the torque wrench.
12. Repeat for other calipers: Repeat steps 8-11 for each caliper in the system.
13. Top off the reservoir: After bleeding all the calipers, top off the reservoir with new brake fluid.
14. Clean up: Wipe down any spills and dispose of the old brake fluid properly.

Tips for Successful Brake Fluid Replacement

• Avoid air bubbles: Make sure to keep the reservoir full of fluid at all times to prevent air bubbles from entering the system.
• Use the correct fluid: Always use the type of brake fluid specified by your motorcycle’s manufacturer.
• Don’t overtighten the bleed screw: Using a torque wrench ensures that the bleed screw is tightened to the correct specifications.
• Check for leaks: After bleeding the brakes, carefully inspect the system for any leaks.
• Test your brakes: After replacing the fluid, test your brakes thoroughly before riding.

The Importance of Regular Maintenance

Replacing brake fluid should be part of your regular motorcycle maintenance routine. The frequency varies depending on your riding habits and the type of brake fluid used, but generally, it’s recommended to change brake fluid every two years or 20,000 miles.

Beyond the Basics: Advanced Techniques

For experienced riders who want to delve deeper into brake fluid maintenance, here are some advanced techniques:

• Vacuum bleeding: This method uses a vacuum pump to draw fluid through the system, eliminating the need to pump the brake lever.
• Pressure bleeding: This involves pressurizing the brake system with a special tool to force out the old fluid.
• Flush and refill: This method involves completely draining the system and refilling it with new brake fluid.

A Final Word: Your Brakes are Your Safety Net

Replacing brake fluid is a crucial part of maintaining your motorcycle’s safety and performance. By understanding the process and using the correct tools and techniques, you can ensure your brakes are always in top condition, giving you the confidence to ride with peace of mind.

What You Need to Know

1. What happens if I put the wrong type of brake fluid in my bike?
Using the wrong type of brake fluid can damage your brake system. Different types of brake fluid have different chemical compositions and boiling points. Mixing them can lead to corrosion, reduced performance, and even brake failure.

2. How do I know if my brake fluid is old?
Brake fluid should be clear or slightly amber in color. If it’s dark or discolored, it’s likely old and needs to be replaced.

3. Can I use DOT 3 brake fluid in my bike if it requires DOT 4?
No, it’s not recommended. DOT 4 fluid has a higher boiling point than DOT 3, which is essential for optimal brake performance.

4. What are the signs of brake fade?
Brake fade is characterized by a spongy feel to the brake lever or pedal, reduced braking power, and a burning smell.

5. How often should I bleed my brakes?
Bleeding your brakes is typically done during a brake fluid replacement. It’s not a regular maintenance procedure unless you suspect air in the system.