it's just happening with the bake brake. I checked if the rotors are at 40nm and I bled the system (hopefully correct). where can this sound at the end of the braking process originate from? thank you 🥰
What can be the source of this sound when I'm braking?
byu/GhostBDH inbikewrench
by GhostBDH
25 Comments
You sure it’s not just from the stand bouncing? I didn’t really hear anything odd.
Think it’s just the hollow sound of the alloy in mid air
maybe the caliper moving? It honestly sounds normal its probably just the pads shifting
Can’t hear anything that sounds wrong here, there’s quite a few moving bits amongst the cogs, derailleur etc etc on the back wheel which could be making it sound different to the front wheel.
If it doesn’t do this while riding there’s nothing concerning here.
many people said it may be the stand but it’s not. just tried it on the floor without the stand. it definitely comes from the brake and maybe even the brake pads
Not good for your pads to get the wheel going so fast and just hard braking in the repair stand. Creates localized deposits of pad material that can easily lead to contamination.
Does it happen if you spin the rear wheel at the same speed you can spin the front wheel?
Usual cause of that sound: There is space between the end of the brake pads and the caliper body (otherwise, the pad would jam up). The clunk is the brake pads slamming backward into the opposite wall of the caliper because the wheel is not infinitely rigid and has mass (inertia). When rapidly stopped, that inertia wants to spring backward. Since the pads are gripping the rotor, it pushes the pads to the other side of the caliper body.
Sometimes cause: loose rotor bolts. All the same as above except it’s the bolt shank clunking in the hole instead of the pads in the caliper.
Why not the front? You can’t spin the wheel fast enough by hand.
Uh you do know that brake pads have play in them front to back, it will make noise like this because it’s essentially slamming into the caliper body. Nothing to worry about, you’re just paranoid. Try rocking your bike back and forth with it on the ground, and you’ll feel it.Â
Sounds to me like the freehub engaging. Is the sound as intense when the wheel is spinning slower?
Sounds like one of the following if it does it while riding….
1) Pads moving in caliber when braking.
2) caliber movie because it’s not tightened correctly.
3) lose disc, especially if it’s a centerlock… Take off disc put grease on the splines and put disc on and tighten.
I could be mistaken but it’s usually one of those
Could also be rear axle remove and make sure it’s greased correctly/enough
Brake pads moving inside caliper. Or with that short squeek it could also be the disc which begins to vibrate shortly before the stop. Do you have organic brakepads?
Also the spoke crossings can produce sound.
Anyway, this is not normal use case so if your brakes work fine while normal use, you don’t have to wory.
This is the sound of suddenly locking the brake on a stand. I suspect it will sound different if you brake while riding the bike.
That’s either your rotor, your pads moving or your spokes. It’s normal because there’s a lot of momentum carrying the wheel and rotor.
I really have no idea what sound you are referring to? All sounds normal to me. Do you mean the single, loud click sound? If so, it sounds like your cassette coming to a sudden stop. Other than that, I have no idea what sound you mean.
I can’t hear anything weird from the video, but try wiggling the rear wheel side to side and see if there’s any play
I think the sounds is there because wheel stops very abruptly. There is a video of a car brake in a stand, it does the same
My best guess: it’s caused by the momentum of the cassette and chain
When you apply the brake suddenly in the stand, the wheel stops but the cassette wants to keep freewheeling
The momentum of the cassette and chain rotates cassette forward, which pulls on the chain which extends the derailleur cage just a bit
The cage snaps back into place, pulling the chain and cassette backwards.
You have a high end derailleur which will have a lot of tension in that spring
You’ll never hear that on the road -if you lock up your wheel that quickly, you’ll start skidding
The larger the cassette diameter, the more pronounced this sound will be.
The sound you’re hearing is called Harmonic Inertia.
(no it’s not…I just completely made that up)
Basically a lot of very fast moving parts stopping abruptly – as others have elaborated on. You can’t repeat this with the front wheel because a. you can’t get it spinning anywhere near as fast, b. way fewer moving parts (i.e. drivetrain)
You’re also kind of creating an issue that doesn’t really exist while on the bike. If your wheel stops that abruptly while riding, there will be far worse noises that you will likely hear.
If it’s nice where you live… Go ride and enjoy!
That’s normal. Bang comes from cassete/freehub when it stops suddenly from freespining.
Sounds like the pads moving forward then bouncing back caused by a big momentum change. Does it do this during normal operation? Because this isn’t normal operation.
Sounds normal with bike on stand and hard quick braking.
Totally normal sound
Pads shifting inside the caliper. Completely normal.
Pads shifting, I’d say.