Hydraulic disc brakes like the Shimano BR-R7170 [paid link] offer exceptional stopping power and performance, making them a popular choice among road cyclists. However, to ensure they continue to perform at their best, regular maintenance is essential, including bleeding the brake system. Over time, air can enter the brake lines, reducing braking efficiency and causing issues like spongy brake levers. This guide will walk you through the process of properly bleeding and maintaining your Shimano BR-R7170 [paid link] hydraulic disc brakes to keep them running like new.
Tools Required
- Shimano hydraulic brake fluid (Mineral Oil [paid link])
- Shimano brake bleed kit [paid link]
- 7mm and 10mm wrenches
- T10 Torx driver
- Isopropyl alcohol (for cleaning)
- Clean rags or paper towels
- Brake fluid catch bottle
- Shimano bleed block
- A syringe (or fluid reservoir with a suitable adapter)
- Plastic hose (provided with the bleed kit [paid link])
Understanding the Importance of Bleeding Your Shimano BR-R7170 Hydraulic Disc Brakes
The Shimano BR-R7170 [paid link] hydraulic disc brakes rely on hydraulic fluid to transfer force from the brake lever to the caliper, allowing for smooth and consistent braking. However, if air enters the brake lines, it can cause the lever to feel spongy, reducing braking power and responsiveness. Bleeding your brakes removes air from the hydraulic system, ensuring your brakes perform at their peak.
In addition to addressing air bubbles, regular maintenance of hydraulic disc brakes ensures the system is functioning optimally, extends the lifespan of the brake components, and ensures safety while riding. Over time, hydraulic fluid can also break down and become contaminated, making it necessary to replace it to maintain braking performance.
How to Bleed Shimano BR-R7170 Hydraulic Disc Brakes
Bleeding Shimano BR-R7170 hydraulic disc brakes is a relatively straightforward process, but it requires careful attention to detail. Below is a step-by-step guide to help you perform the procedure correctly.
Step 1: Prepare Your Work Area
Before starting, ensure you have a clean and stable work environment. Lay down a protective sheet or cloth to catch any spills, as brake fluid can damage paint and other surfaces.
Step 2: Remove the Brake Pads and Insert the Bleed Block
To prevent brake fluid from coming into contact with the brake pads, remove them from the caliper. Insert a Shimano bleed block into the caliper to prevent the pistons from moving during the bleeding process. This also keeps the brake system from being contaminated with fluid.
Step 3: Set Up the Bleed Kit
Next, attach the syringe to the brake lever’s bleed port using the appropriate adapter provided with your Shimano bleed kit [paid link]. Ensure that the syringe is filled with the recommended Shimano hydraulic brake fluid (Mineral Oil [paid link]).
Step 4: Open the Bleed Port
Using a 7mm wrench, loosen the bleed port bolt on the brake lever to allow fluid to flow. Attach the plastic hose to the syringe and ensure it’s securely fitted to the lever bleed port.
Step 5: Pump Fluid Into the System
Begin pumping the syringe slowly to push the fluid through the brake line, forcing air out of the system. You will notice bubbles in the fluid, indicating that air is being expelled from the lines. Keep an eye on the fluid levels in the syringe, topping it up as necessary to avoid drawing air into the system.
Step 6: Close the Bleed Port
Once you see clear fluid without bubbles coming through the hose, tighten the bleed port bolt on the brake lever using a 7mm wrench to prevent leaks.
Step 7: Remove the Syringe and Clean the Area
Carefully remove the syringe and hose from the brake lever, making sure not to spill any brake fluid. Use a clean rag or paper towel to wipe away any fluid that may have leaked during the process. It’s also essential to clean the area around the bleed port with isopropyl alcohol to ensure no brake fluid residue remains.
Step 8: Reinstall the Brake Pads
With the brake pads removed earlier, carefully reinstall them back into the caliper. Ensure the pads are aligned correctly and that the bleed block is removed from the caliper before final assembly.
Step 9: Test the Brake Lever Feel
After completing the bleeding process, pull the brake lever to check the feel. The lever should feel firm and responsive without any sponginess. If the lever still feels soft or spongy, repeat the process or check for additional air in the brake lines.
Step 10: Check the Brakes for Leaks and Reassemble
Ensure that all bolts are properly tightened, and check for any signs of brake fluid leakage. Once you’re satisfied with the setup, reassemble your brake system, ensuring that the rotor and caliper are correctly aligned.
Maintaining Your Shimano BR-R7170 Hydraulic Disc Brakes
Proper maintenance extends the lifespan and reliability of your Shimano BR-R7170 brakes. In addition to regular bleeding, other maintenance tasks are critical for ensuring consistent performance.
Regular Fluid Checks
Hydraulic brake fluid degrades over time and can also absorb moisture, compromising brake performance. It’s essential to monitor fluid levels and replace the fluid at regular intervals, generally every 1-2 years, depending on usage and environmental conditions.
Cleaning the Calipers and Rotors
Brake calipers and rotors should be cleaned regularly to remove dirt, debris, and oil that can affect braking efficiency. Use a clean rag soaked in isopropyl alcohol to wipe down the rotor and caliper. Be cautious not to get any oil or lubricant on the braking surfaces, as this can significantly reduce braking power.
Inspecting for Leaks
Inspect your brake lines and components regularly for signs of wear or leaks. If you notice any leaks or if the brake fluid is low, perform a bleed and check for damaged seals or components that may need replacement.
Brake Pad Wear
Monitor the condition of your brake pads regularly. Worn pads can decrease braking performance and may cause uneven rotor wear. Replace your brake pads when they have worn down to about 1mm thickness or if they show signs of uneven wear.
Conclusion
Bleeding and maintaining your Shimano BR-R7170 hydraulic disc brakes is crucial for ensuring optimal performance and safety. By following the proper steps, you can prevent issues like spongy levers and poor braking power. Regular maintenance, including fluid replacement and pad inspection, will extend the lifespan of your brakes and help you get the most out of your Shimano BR-R7170 setup.
With these simple steps, you can keep your brakes performing at their best, providing you with reliable stopping power on every ride.