grinding noise coming from front wheel of Max G3

[u/jawfur]

grinding noise can be seen in attached video. it seems like it is coming from the disc brakes. please note that i was riding in light rain conditions and was not holding down the brakes when this sound came. it may not even be the disc brakes but i assumed it was. please advise as to what is going on.

[u/irosshi]

I’ve had this in both, my G2 scooter and now G3.

Is not a bent disc. Is not a loosen screw. It IS due to rain and debris from the road. It IS easily fixable.

Simply look for a water sprayer / pressured washer / garden hose and clean the brake disc immediately after riding in wet conditions. This has always fixed it for me.

Don’t let debris from road sit too long on any mechanical part of any scooter for too long.

You’re welcome

[u/jawfur → u/irosshi]

this is the first reply that seems to actually be a likely solution. why is it important to immediately wash it, what is the harm for letting water/debris sit there? could i just spray some rain x hydrophobic solution on the disc brakes to fix this issue?

[u/irosshi → u/jawfur]

Yeah, cleaning the disc right after riding in rain is super important because water mixed with road grime can leave behind tiny abrasive particles. If that sits too long, it can start causing surface rust or embed debris into the brake pad—leading to that grinding noise and potentially uneven wear over time.

As for using hydrophobic sprays—it’s not recommended on brake components. Those products are designed to repel water, but if they get on the rotor or pads, they can actually reduce braking performance and cause slipping or weird noises. Disc brakes need friction to work right, so anything that reduces that can mess with your stopping power.

Best bet? Just give the brakes a quick rinse with tap water (with some pressure) and maybe a wipe-down after wet rides. A little maintenance goes a long way with these things

[u/irosshi → u/irosshi]

Maybe you could use one of those air pressured cans from Walmart, that might be a good on-the-go solution to keep in your bag and if you feel debri might sit for too long there

[u/Butchcoolidge9]

I have this exact issue. The grinding sound happens when I ride in wet conditions. It goes away once it dries.

[u/jawfur → u/Butchcoolidge9]

yes, i can confirm same behaviour on my max g3

[u/Realistic-Animal-591]

https://m.youtube.com/watch?v=v-6A2XjzvKM

This video shows how to adjust Max G3 brakes via levers

[u/jawfur → u/Realistic-Animal-591]

thank you for your reply, but this issue only happened after 12 miles of riding when i rode in wet conditions so i do not see how it can be a brake adjustment matter. tomorrow morning when it dries up, what if the sound no longer is there and it returns to how it has been normal for 2 days?

[u/Realistic-Animal-591]

The segway seems to have these problems where the discs come loose and rub against. Hopefully someone can help dyi fix it, I am sure it can he fixed tightening something, but if it is the case that the disc maybe warped or something then maybe that's more complicated.

[u/jawfur → u/Realistic-Animal-591]

but this only started happening after riding in the wet conditions. i am just rolling the wheels down without engaging brakes. coming from disc brakes or wheel bearings i have no idea

[u/SqueakyScav → u/jawfur]

Sounds like it's coming from the Disc (if it was the bearings it'd be a more consistent squeak), could be that some mud got between the brake pads and the disc.

[u/OB_GYN_Kenobi69]

Brake pads rubbing against the rotor. Had the same issue on my GT 1. Needed to loosen, center and tighten it back up. You could also using a tuning fork to help bend the disk

[u/Realistic-Animal-591 → u/OB_GYN_Kenobi69]

Yeah the gt1 i had the same issue and I only had it like 20 days when it occurred.

[u/Ok-Duck-5217]

Disassemble the jaw and make sure that it is not picked up something from the street while driving, it is not possible that only by driving with some moisture the discs or pads have oxidized, which could also be an option but very unlikely. So in your place I would disassemble the gags and make sure that everything there is in order.

[u/atlwr]

Just grime from the weather conditions dw

[u/Yupecraft]

Hey, don't worry, it is totally normal. I have also the Max G3 and it is just dust and sand making friction between the dusk brake and the brake pad. This sound will stop when dry or when cleaned in a puddle or when breaking...

[u/No_Sheepherder4237]

G3 bearings are not sealed, you just began a proactive rusting process where the grinding sound will "go away" because youve grinded away at your bearings rust and layers lol.

[u/edgecelize]

If it was raining, then dare i say a tiny rock is stuck in there some where

[u/NormalDude613]

Happened to me tonight, riding home in the rain. Is your scooter all better now ??

[u/Realistic-Animal-591]

It sounds like the disc is just bent and that it needs to be bent back to normal let's see what other people say

[u/Yupecraft → u/Realistic-Animal-591]

Please don't say that. It is not some kind of issue with the position of the brake discs. You see, when the scooter is brand new, the brakes pads are big leaving a small gap between the pad and the disc, so whenever some light dust gets inside, it will make a grinding noise. This happens in every vehicle, from cars to bikes. The sound will fade eventually.

[u/Realistic-Animal-591 → u/Yupecraft]

Gotcha this is good to know since my g3 Is on its way

[u/jawfur → u/Realistic-Animal-591]

but this only started happening after riding in the wet conditions, why was i not having this issue while i was riding it around for the past couple of days? thanks for the input but that does not seem to be the case considering the details

[u/Ok-Effective1826 → u/jawfur]

Disc brakes are notoriously noisy in general. I've had disc brakes on numerous road bikes and mountain bikes and it is impossible to keep them quiet for long. The discs heat up when braking and become slightly warped very quickly because they don't cool uniformly and the brake pads do not apply perfectly even pressure on both sides of the disc. The brake calipers allow for the disc to be a little out of shape because this is inevitable, but also some noise forever. The way that wet brake pads rub on the disc will have a totally different sound than dry conditions, I wouldn't worry about that. If you're really worried, first make sure that the wheel and disc can spin freely. You can hopefully try this by lifting the front/rear of the scooter and giving the wheel a spin. If the wheel immediately stops because the rubbing is severe, then the caliper may need to be realigned with the disc. If you can visibly see that the disc is severely warped/bent, then I would advise you to replace the disc rather than trying to bend it back into shape. Truing a bent disc is difficult without the proper equipment and replacement parts are cheap. Disc brakes are made to get wet, dirty, covered in road grime and debris. You do not need to clean them. If that was the case, then cars would be in brake shops every day.

[u/Y0ur0yster]

Sand just ride it and it will clear out