How to Adjust BMX U-Brakes?
In this short video, we demonstrate the correct brake adjustment method of Boardy scooters, focusing on spring tension and arm centering. Learn how to fine-tune your brake arms using a 13 mm wrench and a 5 mm hex key to achieve balanced movement and optimal braking performance.
Tools Required for brake adjustment
- 13 mm wrench
- 5 mm hex key
- Torque wrench (optional, for precise bolt tightening)
This brake is a BMX U-brake. The brake arm springs are located inside the arms, beneath the fixing bolts, and are covered by black aluminium caps that can be turned using a 13 mm wrench.
First, adjust the left side
Note: Opposite the brake lever side. Left when viewed from the front, as shown in the video; this is actually the right side in the direction of travel.
- Loosen the Allen bolt using a 5 mm hex key.
- Turn the spring tension cap clockwise with a 13 mm wrench to increase tension.
- Hold the 13 mm wrench in the position shown in the picture, and tighten the Allen bolt with the 5 mm hex key to approximately 10 Nm of torque.
Important: Do not rotate the spring cap beyond the horizontal position (as shown in the picture), as the spring may dislodge from its seat.
Next, adjust the other side
Note: the brake lever side.
To increase spring tension on this side, turn the cap counterclockwise (and clockwise to decrease).
Final Check
Test the brake. If one arm moves less than the other, slightly increase the spring tension on that side. If one arm moves more than the other, slightly decrease the spring tension on that side.
Aim to adjust both springs so that the two arms move symmetrically.
Don’t forget, that regular maintenance of your brakes is crucial for ensuring safety and optimal performance. Here’s a comprehensive guide on maintaining BMX brakes.
