Shimano’s BR-R7170 [paid link] disc brakes are renowned for their precision, reliability, and powerful stopping performance. Keeping these brakes in peak condition ensures safety and extends the lifespan of your braking system. This guide will take you through the essential maintenance steps to ensure that your Shimano BR-R7170 [paid link] disc brakes continue to perform optimally for years.

Routine Cleaning and Inspection

One of the most important steps in maintaining your Shimano BR-R7170 [paid link] disc brakes is performing regular cleaning and inspection. Brake performance can be compromised by dirt, debris, and brake pad wear, which can degrade stopping power and lead to premature damage.

• Clean the Rotors Regularly: Dirt and grime can build up on your rotors, especially if you ride in wet or muddy conditions. Use isopropyl alcohol (minimum 70%) and a clean, lint-free cloth to wipe down the rotor surfaces. Never use soap or oil-based cleaners as they can leave residues that affect braking performance.
• Check Brake Pads for Wear: Over time, your brake pads will wear down, reducing their stopping power. Shimano BR-R7170 pads typically have wear indicators; make sure to replace them once the pads have worn to the recommended thickness. If the pads are unevenly worn, it might indicate that the caliper needs to be adjusted.
• Inspect the Brake Lines: For hydraulic disc brakes like the BR-R7170, it’s vital to check for any leaks in the brake lines. A small leak can drastically reduce braking efficiency, and if left untreated, can lead to complete brake failure. Look for any fluid puddles or discoloration along the hoses, and if you find anything suspicious, consult a professional mechanic.

Adjusting the Brake Pads

Proper brake pad alignment is crucial to ensuring smooth, efficient braking performance. Misaligned pads can cause the brake to drag or rub against the rotor, resulting in a loss of power and premature wear.

1. Positioning the Brake Pads: Ensure that the brake pads are correctly positioned relative to the rotor. The pads should contact the rotor evenly, without any tilt or angle that could cause uneven wear. You can adjust the pad position by loosening the bolts on the brake caliper and moving the pads slightly.
2. Caliper Alignment: Sometimes, the caliper itself may become misaligned, causing the pads to rub on the rotor. To correct this, loosen the caliper mounting bolts, squeeze the brake lever to center the caliper over the rotor, and then retighten the bolts. Make sure the rotor spins freely without rubbing against the pads.

Bleeding the Brakes

Hydraulic disc brakes like the Shimano BR-R7170 can suffer from air bubbles in the brake lines, which causes the brakes to feel spongy or unresponsive. To maintain optimal brake feel, it’s necessary to bleed the system periodically.

• Prepare the Brake Bleed Kit [paid link]: Shimano offers a brake bleed kit [paid link] that includes everything you need, such as the necessary tools and hydraulic fluid. Ensure that you have a clean, well-ventilated area for this process to prevent contamination of the hydraulic fluid.
• Follow the Proper Bleeding Procedure: Start by removing the brake lever and the caliper from the bike, following the manufacturer’s instructions for your model. Attach the syringe to the brake lever and another to the caliper to force the brake fluid through the system. Ensure the fluid is clear and free of air bubbles before reassembling the brake components.
• Check Brake Feel: After bleeding the brakes, squeeze the brake lever. It should feel firm, with little to no sponginess. If the lever still feels soft, repeat the bleeding procedure.

Rotor and Caliper Maintenance

Maintaining the rotor and caliper is crucial for achieving the best braking performance. Over time, rotors can become warped or contaminated, while the calipers may experience wear from constant use.

• Rotor Truing: If your rotor becomes warped, it will cause the brake pads to rub, reducing braking power and causing noise. You can true the rotor by using a rotor truing tool or by gently adjusting it by hand if the deformation is minor. Make sure to check that the rotor is centered between the brake pads and that there is no rubbing when the wheel spins.
• Lubricate the Caliper: Apply a small amount of lubricant to the caliper’s moving parts (e.g., the pad retention pins) to ensure smooth operation. Be cautious not to get lubricant on the rotor or brake pads, as this can negatively affect braking performance.

Brake Fluid Maintenance

For hydraulic systems, proper brake fluid maintenance is essential to ensure smooth and reliable braking. Shimano’s BR-R7170 system uses mineral oil [paid link], which should be replaced at least once every two years, or more frequently if you notice a decrease in performance.

• Check Brake Fluid Levels: Check the brake fluid level [paid link] in the reservoir to ensure it is at the recommended level [paid link]. If the fluid level [paid link] is low, top it off with Shimano’s mineral oil [paid link]. Be cautious not to overfill the reservoir, as this can cause excess fluid to spill out when the brake lever is pressed.
• Replace Old Brake Fluid: Over time, brake fluid can absorb moisture from the air, which may compromise braking performance. If you notice your brakes becoming less responsive or if the fluid appears cloudy, it’s time to replace it.

Testing and Fine-Tuning Brake Performance

Once all maintenance tasks are complete, it’s crucial to perform a test ride and make any necessary adjustments to fine-tune the braking system.

• Test Ride: Take the bike for a short ride in a safe area and test the brakes under different conditions. Pay attention to how the brake lever feels, how responsive the brakes are, and if there is any unusual noise or vibration.
• Brake Lever Reach Adjustment: Shimano BR-R7170 disc brakes feature an adjustable reach lever, allowing you to fine-tune the distance between the brake lever and the handlebar. Adjusting the reach helps ensure that you can engage the brakes comfortably and effectively, especially for riders with smaller hands.

Storing Your Bike Properly

Proper storage can also play a significant role in extending the lifespan of your Shimano BR-R7170 disc brakes. Store your bike in a cool, dry environment, away from extreme temperatures or moisture. If you’re storing your bike for an extended period, it’s a good idea to lift the wheels off the ground to prevent any pressure on the braking system.

Conclusion

By following these maintenance tips, you can keep your Shimano BR-R7170 disc brakes running at their best, ensuring maximum stopping power and safety. Regular inspection, cleaning, pad adjustments, and brake fluid maintenance are all essential for preserving the performance of your braking system. With proper care, your Shimano BR-R7170 disc brakes will continue to provide reliable performance for many years of cycling enjoyment.