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Hydraulic Brakes Adjustment Guide for E-Bike

Experiencing brake noise or rubbing on your electric bike (e-bike) or electric trike? It's not uncommon, especially during the initial break-in period, for new brakes to exhibit some noise or slight rubbing. However, if this persists beyond 25-50 miles, it's time to adjust your hydraulic brakes to ensure optimal performance and safety. This comprehensive guide is tailored for e-bike and electric tricycle owners, covering everything from ensuring proper wheel placement to caliper centering and brake lever adjustment.  If your brakes are new, click HERE to complete the bedding-in brakes process.

Preparing Your Electric Bike or Trike for Maintenance

Before diving into the adjustments, ensure your e-bike or electric trike is ready for maintenance. Turn off the power, remove the battery, and press the Power button to discharge any residual power. Remember, never flip your e-bike or electric trike when working on hydraulic brakes to avoid introducing air into the brake lines, which could lead to brake failure. Instead, use a bike repair stand or lift.

Tools You'll Need:

  • Bike repair stand or lift
  • 2mm and 5mm Allen wrenches
  • Torque wrench
  • 18mm wrench
  • Flat side cutters
  • A sheet of paper

Step 1: Check the Wheel Position

Ensure the wheel is fully seated in the frame dropouts. An improperly seated wheel can cause the brake rotor to rub against the brake pads, creating noise. For front wheels, adjust the quick release lever, ensuring it's properly tensioned. For rear wheels on your electric bike or electric trike, use an 18mm wrench to adjust and properly seat the wheel in the dropouts.

Step 2: Inspect the Brake Rotor

Wearing protective gloves to avoid contact with the rotor's sharp edges, spin the wheel to ensure it moves freely with minimal contact between the brake pads and rotor. Use a sheet of paper behind the brake caliper to check if the rotor is true (straight). A wobbly or damaged rotor may need replacement.

Step 3: Center the Brake Caliper

Loosen the caliper bolts with a 5mm Allen wrench and manually align the caliper so the brake pads are parallel to the rotor. While holding the brake lever, retighten the bolts. Spin the wheel to check for rubbing. If necessary, make minor adjustments until the brake pads no longer rub against the rotor.

Step 4: Adjust the Brake Lever Reach

Finally, tailor the brake lever reach to your comfort using a 2mm Allen wrench. Ensure there's enough space between the brake lever and the handlebar grip to prevent the lever from touching the grip when fully applied. This is crucial for ensuring your e-bike or electric trike's brakes function effectively, preventing potential accidents.


Adjusting the hydraulic brakes on your electric bike or electric trike is crucial for maintaining optimal performance and safety. By following these steps, you can ensure a smooth and noise-free braking experience. Remember, if you're not confident in performing these adjustments yourself, it's always best to seek the expertise of a certified and reputable bike mechanic. Keep your e-bike or electric trike in top condition to enjoy the best possible riding experience.

If you have any inquiries or need further assistance, feel free to contact our support team at support@perraroelectricbike.com or call us at (949) 414-8003.

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