BR-R8070 Disc Brake Installation Mistakes That Can Ruin Your Braking Performance

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When it comes to ensuring top-notch braking performance, the Shimano BR-R8070 [paid link] hydraulic disc brakes offer exceptional reliability and stopping power. However, even the best components can underperform if installed incorrectly. Mistakes during installation can lead to poor braking, excessive wear, or even safety hazards. In this guide, we will examine the most common installation errors cyclists make with Shimano BR-R8070 [paid link] disc brakes and provide detailed solutions to help you achieve optimal braking performance.

Understanding the Shimano BR-R8070 Disc Brakes

The Shimano BR-R8070 [paid link] is a high-performance hydraulic disc brake designed for road bikes. With features such as adjustable reach, Servo Wave technology for a more responsive feel, and optimized brake modulation, the BR-R8070 is a popular choice among serious cyclists. However, improper installation can compromise its efficiency, leading to issues like uneven pad wear, poor braking power, or even brake failure.

Common Shimano BR-R8070 Installation Mistakes

1. Incorrect Rotor Size or Installation

One of the most frequent mistakes during Shimano BR-R8070 installation is using the wrong rotor size or misaligning the rotor during installation. The BR-R8070 is designed for use with specific rotor sizes, and choosing the wrong one can affect braking performance.

Solution:

  • Check compatibility: Shimano recommends using either 140mm, 160mm, 180mm, or 203mm rotors with the BR-R8070, depending on your frame and riding style.
  • Ensure proper alignment: During installation, ensure that the rotor is centered between the brake pads to prevent rubbing or inefficient braking. Use a rotor truing tool to straighten any warped rotors.

2. Over-tightening Brake Caliper Mounting Bolts

When mounting the brake calipers, many cyclists make the mistake of over-tightening the bolts. This can distort the caliper housing or cause the brake to misalign, leading to inconsistent braking performance.

Solution:

  • Use the correct torque settings: Shimano recommends a torque of 6-8 Nm for the caliper mounting bolts. Always use a torque wrench [paid link] to avoid over-tightening.
  • Install the caliper evenly: Tighten the mounting bolts progressively in a crisscross pattern to ensure that the caliper is mounted straight and aligned properly with the rotor.

3. Not Properly Bleeding the Brakes

Hydraulic disc brakes, including the Shimano BR-R8070, require periodic bleeding to ensure that air bubbles do not enter the brake lines. Failing to properly bleed the brakes during installation can lead to a spongy brake feel and poor stopping power.

Solution:

  • Follow Shimano’s recommended bleeding procedure: Always use the correct Shimano mineral oil [paid link] and bleed the system according to the manufacturer’s instructions. This will remove any trapped air and ensure optimal brake performance.
  • Double-check for air bubbles: During the bleeding process, ensure there are no air bubbles in the brake lines. After bleeding, squeeze the brake lever several times to confirm the brake lever feels firm.

4. Incorrect Brake Pad Installation

Improper installation of brake pads is another mistake that can lead to issues like uneven pad wear or poor braking. It’s essential to install the pads in the correct orientation and ensure they are correctly positioned in the caliper.

Solution:

  • Install pads according to Shimano specifications: Make sure the brake pads are installed in the correct orientation (Shimano typically marks the pads with an arrow indicating the proper direction). Be sure to seat the pads fully into the caliper slots.
  • Check the pad alignment: Use a brake pad alignment tool to ensure that both pads are parallel to the rotor surface, which ensures even pad wear and consistent braking power.

5. Improper Hose Routing

When installing the brake hoses, incorrect routing or excessive bends can lead to a reduction in hydraulic performance. Sharp bends or kinks in the hose may create a “spongy” brake feel, as the hydraulic fluid can’t flow efficiently.

Solution:

  • Route the hose properly: Ensure that the brake hoses follow smooth, gentle curves from the lever to the caliper, avoiding any sharp bends. Use hose guides or cable ties to secure the hose in place.
  • Cut the hose to the right length: If necessary, trim the hose to the correct length, leaving just enough slack to allow smooth operation without causing bends.

6. Not Installing the Correct Brake Lever

The Shimano BR-R8070 is designed to work with specific brake levers that match the hydraulic system. Using the wrong brake lever can result in improper brake actuation and an inconsistent brake feel.

Solution:

  • Match the lever with the caliper: Ensure you are using Shimano’s hydraulic brake levers designed specifically for the BR-R8070 calipers, such as the Shimano ST-R8070 or similar compatible models. This ensures proper fluid actuation and performance.

7. Failing to Center the Calipers

A misaligned brake caliper can result in uneven brake pad wear or rotor rubbing. This is a common mistake, especially when installing the caliper in a rush.

Solution:

  • Center the caliper properly: After installing the brake caliper, loosen the caliper mounting bolts slightly and squeeze the brake lever to center the caliper over the rotor. Once the caliper is centered, tighten the bolts evenly while holding the brake lever in position.

8. Ignoring Brake Pad Wear Indicators

Failing to install new brake pads when necessary or ignoring the wear indicators on the pads can affect braking performance. Worn-out pads can result in poor braking and damage to the rotor.

Solution:

  • Replace worn brake pads: Regularly check the brake pads for wear. If the wear indicator is visible or the pads have become thin, replace them immediately to avoid rotor damage and ensure reliable braking.

Conclusion

Installing Shimano BR-R8070 hydraulic disc brakes may seem straightforward, but there are several common mistakes that can ruin their performance if not carefully addressed. From selecting the correct rotor size to ensuring proper brake pad installation, every step of the process plays a crucial role in achieving optimal braking efficiency. By following the detailed solutions provided here, you can ensure your BR-R8070 disc brakes are installed correctly and function at their best, providing maximum stopping power and reliability for your rides.