How to Install and Adjust the SHIMANO 105 BR-R7170 Hydraulic Disc Brakes

Posted on
in No category

The Shimano 105 BR-R7170 [paid link] hydraulic disc brake system delivers consistent, high-performance braking for modern 12-speed road bikes. Proper installation and adjustment ensure maximum stopping power, safety, and smooth braking modulation. Whether upgrading from rim brakes or replacing an existing hydraulic setup, this guide will walk you through the full installation, bleeding, and fine-tuning process to get the most out of your Shimano 105 BR-R7170 brakes.

Before starting, it’s important to understand the key benefits of hydraulic disc brakes over mechanical systems. Unlike traditional cable-actuated brakes, hydraulic disc brakes provide superior power, modulation, and reliability, especially in wet conditions. To ensure proper performance, correct installation and maintenance are crucial.

Tools Required

Installing the Shimano 105 BR-R7170 Hydraulic Disc Brakes

Before mounting the brake calipers, ensure your frame and fork are designed for flat-mount disc brakes. If transitioning from rim brakes, you may need flat-mount adapters for compatibility.

Start by attaching the brake calipers to the frame and fork using a 5 mm Allen wrench [paid link]. Ensure the calipers are aligned with the mounting holes and tighten them just enough to hold position without fully securing them. This allows for later fine-tuning of alignment.

Next, install the brake rotors onto the wheel hubs. The Shimano 105 BR-R7170 [paid link] uses Center Lock rotors, which require a lockring tool [paid link] for installation. Tighten the lockring to the manufacturer’s torque specification to prevent rotor loosening during rides. If using 6-bolt rotors, tighten them evenly in a star pattern to ensure proper seating.

Now, route the hydraulic brake hose from the shifter to the caliper. If cutting the hose to size, use a Shimano hose cutter to ensure a clean, square cut. Insert the olive and barb fittings into the hose, then secure it using the brake lever’s connection port. Be careful not to overtighten, as excessive force can damage the fittings and cause leaks.

Bleeding the Brake System

Since hydraulic disc brakes rely on Shimano mineral oil [paid link], it’s essential to properly bleed the system to remove air bubbles. Air trapped inside the brake lines can cause spongy, inconsistent braking.

Begin by removing the brake pads and inserting a bleed block into the caliper. This prevents excess fluid from contaminating the pads and ensures the pistons remain correctly positioned.

Attach the Shimano bleed funnel to the top of the brake lever’s bleed port. Fill the funnel with Shimano mineral oil [paid link] and gently squeeze the brake lever to push air out of the system.

At the caliper end, connect a syringe filled with mineral oil [paid link] and slowly pull fluid through the system, ensuring all air bubbles escape. Tap the brake hose lightly along its length to dislodge trapped air. Once air-free oil flows through, tighten the bleed ports and remove excess oil from the funnel.

Wipe down all components using isopropyl alcohol to remove any residual oil that could contaminate the brake pads.

Fine-Tuning and Adjustments

After installing and bleeding the system, proper caliper alignment and pad spacing are crucial for optimal braking performance.

Begin by loosening the caliper mounting bolts slightly while the wheel is installed. Squeeze the brake lever firmly and hold it while gradually tightening the caliper bolts. This allows the brake caliper to center itself around the rotor automatically.

If brake rub occurs, inspect the rotor for warping and true it using a rotor truing tool if necessary. Shimano rotors are heat-treated for durability, but minor misalignment can happen after prolonged use.

Check for proper lever feel by squeezing the brakes. If the lever feels too soft, additional bleeding may be required. If the brake lever feels too firm or unresponsive, ensure the hose isn’t pinched or over-tightened at the connection points.

Once satisfied with the setup, reinstall the brake pads and perform a burn-in procedure. To do this, perform a series of hard stops from moderate speeds to deposit an even layer of brake pad material onto the rotor, improving initial bite and consistency.

Long-Term Maintenance and Troubleshooting

Regular maintenance ensures that Shimano 105 BR-R7170 [paid link] hydraulic disc brakes continue performing at their best. Cleaning the rotors and pads with isopropyl alcohol after wet or dusty rides helps prevent brake contamination.

Monitor brake pad wear frequently—replace them when the pad thickness reaches 1 mm or less. If lever feel deteriorates over time, air may have entered the system, requiring a quick bleed to restore braking power.

If you experience inconsistent braking or squealing noises, ensure that the rotor is properly aligned and free from contaminants. Sometimes, rotor glazing occurs due to excessive heat buildup—light sanding of the rotor surface can restore braking performance.

Related Articles

Final Thoughts

The Shimano 105 BR-R7170 hydraulic disc brakes provide exceptional braking performance with smooth modulation and reliable stopping power. Proper installation, bleeding, and fine-tuning ensure a safe and confident riding experience.

By following this guide, you can set up, adjust, and maintain your Shimano 105 disc brakes like a professional mechanic. Keep your brakes in top condition through regular inspections, fluid changes, and rotor cleaning for maximum safety and efficiency on the road.