How to Fix Rear Brake Grinding on an Arwibon GT08 Scooter
If the rear brake on your arwibon gt08 scooter makes a constant scraping or grinding sound while the wheel is turning, the brake caliper may be sitting slightly off-center over the disc.
The adjustment shown in the official Arwibon GT08 video is simple: loosen the two caliper mounting bolts, center the brake disc between the pads, hold the caliper in that position, and tighten the bolts again.
Step 1: Confirm the Rear Brake Is Grinding
Lift the rear wheel and rotate it by hand.
In the official arwibon gt08 video, the wheel makes a clear metal scraping sound and does not spin freely.
This condition is shown at about 00:01.
Watch the brake disc as it passes through the caliper. If one brake pad is sitting against the disc, the caliper position needs to be corrected.
Step 2: Loosen the Two Caliper Mounting Bolts
Locate the two Allen bolts holding the rear brake caliper to the swingarm bracket.
The official gt08 electric scooter tutorial points them out at about 00:15.
Use a T-handle Allen wrench or the correct Allen key to loosen both bolts slightly.
This is shown from about 00:20 to 00:25.
Do not remove the bolts.
The caliper only needs enough movement to shift slightly from side to side.
Step 3: Center the Brake Disc Between the Pads
Hold the brake caliper with one hand.
Look directly through the opening in the caliper and check the position of the brake disc.
The official arwibon gt08 scooter video shows this at about 00:30.
Move the caliper gently until the disc sits between the two brake pads.
The video specifically shows that the brake pads should be centered around the disc.
Check both sides.
There should be a small visible gap between the disc and each pad rather than one pad sitting directly against the disc.
This adjustment is shown from about 00:33 to 00:46.
Step 4: Hold the Caliper in Position
Once the brake disc is centered, keep one hand on the caliper.
Do not let it move while the mounting bolts are being tightened.
The official arwibon gt08 video shows the caliper being held in place at about 00:50.
If the caliper shifts during tightening, the disc may start rubbing again even though the position looked correct before.
Step 5: Tighten the Caliper Bolts Alternately
While holding the caliper in the centered position, begin tightening the two mounting bolts.
Do not fully tighten the upper bolt first.
Tighten one bolt slightly, then move to the other.
Continue working between both bolts until they are secure.
The official gt08 scooter tutorial shows this from about 00:58 through 01:14.
Alternating between the two bolts helps keep the caliper from rotating or pulling toward one side during the final tightening.
Step 6: Spin the Rear Wheel Again
Once both bolts are tight, rotate the rear wheel by hand.
The official arwibon gt08 electric scooter video shows this test at about 01:22.
Listen carefully.
The continuous metal scraping sound should be gone, and the rear wheel should rotate more freely.
The video shows the wheel spinning smoothly from about 01:29 through 01:38.
Step 7: Recheck the Brake Disc Position
Look through the caliper one more time.
Make sure the brake disc is still sitting between the two pads after the bolts have been tightened.
If one side is rubbing again, loosen both bolts slightly and repeat the centering process.
Do not try to solve the problem by bending the brake disc or forcing the caliper sideways while the bolts are fully tight.
Step 8: Final Check Before Riding
Before riding the arwibon gt08 scooter, check the rear brake once more.
Make sure:
- both caliper mounting bolts are secure;
- the brake disc sits between the two pads;
- the wheel rotates without continuous scraping;
- the caliper does not move on the swingarm bracket;
- the brake still applies normally when the lever is squeezed.
If the rear wheel still has heavy drag after the caliper is centered correctly, inspect the brake disc and pads before riding the gt08 electric scooter.
This procedure follows the official Arwibon Scooter video “GT08 Rear Brake Grinding Adjustment | Arwibon GT08” and covers the rear brake caliper centering adjustment shown for the arwibon gt08 electric scooter.
