How To Bleed Shimano Brakes | PB Tech Tuesdays

Introduction

This tutorial will guide you through the process of bleeding Shimano brakes. Proper brake maintenance is crucial for optimal performance and safety while riding. Whether you’re a seasoned cyclist or a beginner, knowing how to bleed your brakes can enhance your biking experience.

Step 1: Gather Your Tools and Materials

Before you start, make sure you have the following items ready:

• Shimano brake bleed kit (includes syringe, tubing, and oil)
• Isopropyl alcohol (for cleaning)
• Clean rags or paper towels
• 10mm wrench (for removing the brake caliper)
• A container to catch excess fluid
• A workbench or stable surface

Step 2: Prepare the Bike

1. Position the Bike: Place your bike in a stable position, ideally in a bike stand.
2. Remove the Wheel: Take off the wheel where you need to bleed the brakes to access the caliper easily.

Step 3: Clean the Brake Caliper

1. Wipe Down: Use isopropyl alcohol and a clean rag to wipe any dirt or grime from the brake caliper.
2. Check for Leaks: Inspect the system for any signs of brake fluid leaks.

Step 4: Set Up the Syringe

1. Fill the Syringe: Draw brake fluid into the syringe according to the manufacturer’s guidelines.
2. Attach Tubing: Connect the tubing to the syringe ensuring a tight fit to prevent leaks.

Step 5: Connect the Syringe to the Brake Caliper

1. Remove Bleed Screw: Using a 10mm wrench, remove the bleed screw from the brake caliper.
2. Insert the Tubing: Insert the tubing from the syringe into the bleed screw hole.
3. Secure the Connection: Ensure the tubing fits snugly to avoid air leaks.

Step 6: Bleed the Brakes

1. Push Fluid: Slowly push the brake fluid into the caliper using the syringe. Watch for bubbles in the fluid to ensure air is being expelled.
2. Fill to the Brim: Continue until no more bubbles appear, and the fluid reaches the top of the caliper.

Step 7: Remove the Syringe and Reassemble

1. Disconnect the Syringe: Carefully remove the tubing from the caliper.
2. Replace the Bleed Screw: Screw the bleed screw back into place, ensuring it’s tight to avoid leaks.
3. Clean Up: Wipe any excess fluid from the caliper and surrounding area.

Step 8: Test the Brakes

1. Reattach the Wheel: Put the wheel back on and ensure it’s secured.
2. Pump the Brakes: Squeeze the brake lever several times to ensure the brakes feel firm and responsive.
3. Check for Leaks: Inspect the bleed screw and caliper for any signs of leaking fluid.

Conclusion

Bleeding Shimano brakes is a straightforward process that can significantly improve your braking performance. Regular maintenance can prevent issues and ensure a safer riding experience. After completing this procedure, consider checking other components of your bike for any necessary maintenance or upgrades. Happy riding!