How to Adjust Mechanical Disc Brake on Electric Scooter

Is your scooter suffering from a mushy brake lever, and it’s difficult for you to get the perfect brake grip? If so, then you are at the right place.

After much research and hand testing, we have prepared this guide to help you adjust the mechanical brakes on your electric scooter. Hopefully, after thoroughly reading this guide and taking some ideas from the attached images, you will better understand how to adjust electric scooter brakes. 

So without further ado, let’s get into it

Why My E-Scooter Brake Squeak:

Before jumping into the solution, we should have a look at the causes of why is your brand new scooter brake squeak. There are a dozen reasons, but we have compiled a few of them:

  • There’s a chance that your vehicle’s brake pads aren’t correctly installed, and friction between your scooter elements is causing a squeaking sound.
  • Poorly built brakes and loose nuts will make a squeaking noise whenever they are used because of vibrations.
  • If there is rumbling in the bolts when you press the brakes, dirt or debris may be lodged inside the brakes themselves.
  • A misalignment between the brakes and the road surfaces is a possibility.
  • Extreme temperature
  • Natural wear

Steps To Adjusting Mechanical Disc Brakes:

If you are having an issue with your mechanical disc brakes, then follow these steps:

Required Tools:

  1. Brake Pads and Rotors.
  2. Jack and Jack Stand.
  3. Lug Nut Wrench.
  4. Brake Caliper Piston Tool.
  5. Brake Bleeder Wrench.
  6. Allen Wrench Set.

Step 1: Clean Up the Contaminated Area

First and foremost, examine your brakes to see if there is any contamination in the brakes. There’s a possibility that dust in your brakes makes them difficult to function. Make sure you get rid of all the dust from brakes and rims.

Take a high-quality oil-free degreaser and clean your wheel rims and rotors. Pad washing may also reduce noise; sandpaper or polishing the pads can be used for this purpose. However, if the oil has seeped through the pad, you may need a new one. 

You should start by cleaning the brakes thoroughly and making sure every part is shiny and new. Cleaning the discs could occasionally be a quick and easy remedy using a product designed specifically for that purpose. Isopropyl alcohol is a widespread and effective alternative treatment.

Step 2: Examine Brake Pads

The next thing to check is whether or not your disc brakes are completely worn out. It’s also possible that squeaky brakes result from brake pad wear that isn’t uniform over the vehicle’s surface. It may also indicate that your brakes are not adjusted correctly.

Step 3: Check Brake Alignment

Examine brake alignment since it can be the root cause. To check, first, use a bike stand to fix the brakes. It will not only let you spin the wheel, but you can work effortlessly. Instead of using a stand, you may instead turn your bike over and use it. Keep an eye on how much room there is between the brake lines and the rotor; a gap of 1-2 mm is acceptable.

Step 4: Cable Adjustment

There is a possibility that your scooter is facing this due to the wrong cable adjustment. Moreover, this cable adjustment issue often appears during the early days of ownership because the brakes wear in, and you need to get some slack to adjust that. 

You can make cable adjustments by loosening the brake lever is too tight, and vice versa. For a record, the brake cable is slack enough if the lever slides up the handlebars. Moreover, keep tabs on the wire since it is too small if you have to use a lot of force to compress it.

Take an Allen wrench and adjust the cable clamp if slank is a lot. You can change it by losing the cable clamp, and the slide is as forward as you can lock again as you can in the image below:

Now it’s time to adjust the brakes using an adjuster. Adjusting the tension of the brake cord here is a quick and easy way to make fine-tuned mechanical brake changes.

Step 5: Loosen Up Screws on Caliper

Rotate the wheel to see whether the brakes are dragging, which happens when the pads press too hard on the tire and impede rotation. If the issue is still there, you can free up the dragging mechanical brake system by loosening screws on the clamp or until the wheel spins smoothly.

Take an Allen wrench and adjust the brakes by rotating the bottom and top screws of the caliper gently. You need not make a dozen twists; you can also do a screw loosening job in a couple of twists.

Step 6: Check if there's any Friction between Disc and Caliper:

If your brakes are not working to their best level and the issue is still there, verify if there’s any friction between the disc and caliper. If both components touch each other, try to keep them apart and place them in the correct position, i.e., the center of the gap.

To do so, loosen up the two bolts that hold the caliper in place from the top. Ensure the caliper detaches itself from the tire and wire after the screw is loosened. It is possible to either lock the brake by pulling the cable forth or release it by letting the cable retreat inward from this position.

At this time, the caliper’s position should sync with the part of the rotor, and your brakes are good to go. As you can see, both elements are in the correct position; tighten the screws back in place for additional security.

Final Testing

After following the steps above, i.e., full caliper adjustment and cable adjustment, it’s time to test the brakes. You can test by considering a few factors. 

  • It would help if you spun both wheels to check for friction between the braking rotors and the pads.
  • Press both handlebar grips to ensure that the pads make complete contact with the rotors and that the levers move freely.
  • Check for cracks in all mechanical lines and fittings every other week and preferably before every ride. 
  • Check if there is still rubbing noise or not. If not, the caliper mounting bolts are correct, and the brakes are good to go.
  • Keep examining the sync between the wheel and brake pads by making a one-sixth turn simultaneously. The idea is to relieve the tension and ensure the wheel moves freely.
  • Finally, it’s time to verify that the brake light lights up when you grab the brakes. Make sure that your brake light still works. Since the responsiveness of the brake lever depends upon the brake light. If the brake lights take time to work after pressing the brakes, the brake lever is not responsive yet. Use the adjuster to sync both the brake and lightning illumination process.

Once everything works from light to the wheels, lock down the lock nut. Double check the brake drag and grub screw on the rear pad and the brake drag to avoid any future inconvenience. 

That brings us to the end of our guide. We hope this guide has helped you a lot.