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How To Fix And True A Bent Disk Brake Rotor | Mountain Bike Servicing Essentials
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- Опубликовано: 2 окт 2020
- Doddy is here to let you know how to stop that irritating noise when your brakes are rubbing! We show you how to straighten a bent disc brake rotor. This helps achieve good brake pad contact in order to eliminate brake rub and extend the life of your components. This video tutorial has all the information you need to make your disc brakes straight as can be! 🔧
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Just did this the other day, but another small tip for people trying this for the first time... take your rear wheel off and then put it back on without putting the chain on to the cassette, this will allow you to spin the wheel with out the sound of the freehub body engaging, that way you can listen and hear it rub. It helps pin point where it’s rubbing. Another thing to point out, if it’s still rubbing it’s worth checking piston alignment. Great video Doddie, free speed!
Oh boy, here it goes. I hope my bike doesn't turn into a basket case.🤔🤔
Does this work for the front brake disc
I used a wooden beam, and sawed a slot in it. Worked fine for me.
Bro this is perfect timing, I just bent my rotor yesterday and I needed help trying to bend it back!
Prayers have been heard... My rear brake started to singing just a little bit two weeks ago... what a day to find out that ol Doddy has the answer for it...
Brilliant video, it saved me a bunch of frustration and repair costs. Thank you!
my front disc brakes just started to make noises when riding, the same day you guys are releasing this vid, how convenient... thanks lol!!
Fun I had to do this a couple of weeks ago and I indeed used an adjustable wrench, worked like a charm.
Helpful video. Most caliper alignment instructions fail to mention that they are assuming the rotor is straight. It's easy if it is but if it's already warped you'll likely have to settle for a position where the rotor rubs the least as finding one with no rub at all will be unlikely. However as said in the video a couple of light kisses of the pad here and there are not a problem. It should also be mentioned that some brakes, such as Hope, allow the pad position to be adjusted (how far to either side the pad pair are offset - not the bite point). If they are too far to one side then adjusting the position rather than bending the rotor can also cure slight pad rub, though properly centered pads are preferable.
Cool video Doddy👍😎helpful as always💯
Perfect I just bought this tool.
Thx! I was wondering if I needed a new, rotor...but this looks like best solution.
Great tip with the Sharpie, Doddy. Thanks!
thanks very good instructions, worked on the back wheel of my scooter
Great video!
Very helpful thanks
Thanks GCN!! you saved me from buying a new set of rotors. Spend zero bucks by following this method!! :)
OH MY GOD, PERFECT TIMING
Superb, the exact video i was going to be searching for. 😁 Great timing.
Seriously great timing lol. Need to do this to my bike as well was just about to start researching
Same
Myself as well!
Once had a very small rock weld it’s self to a rotor. It made a small cooling groove in my pad 😝
I like at 8min35sec you say you don't need to get it absolutely perfect, a slight rub is acceeptable.
I have several rags and a rubber mouse pad in my toolbox to keep from scarring/scratching.
Can you do a video on finding color matched rotors and if they’re good quality?
Cheers
Park tool is bankrupting me!!!
If you investigate enough, you can figure out where they buy most of their stuff from. Their torque wrench is famously the exact same wrench as Pedros and Shimano just with a different outer shell (and the Shimano actually comes with bits I believe). I was able to get their brake bleed kit for $20. Has same brass bits, nice syringes, and almost everything else. Just gotta look.
At first I was like what are you talking about but then he showed the bending tools.....
A pliers wrench (without roughened jaws) would be another option as well.
can a 27.5 medium size MTB fit a 29er medium size bottom bracket ? I'm planning to change my three by nine to a one by ten.
I have this same problem on my Emove cruiser scooter.
Got a pair of SM-RT99 that keep warping slightly and no clue why.
I true them. Got out, couple of hard brakings and I can hear them drag again. It's minimal dragging: no slowing down, no feeling in the lever, sound is pretty low (cant hear it riding) but still.
Have I damaged them somehow? Or is it just normal behaviour?
All this time I have been wondering what this noise was coming from my rim. I was thinking it was the whole or loose spokes. Come to find out I noticed a bent disc break. Would that cause a noise I'm hearing?
My wheel appears to wobble. Would that be the cause of disc rubbing? Or can a wheel wobble independently from a disc rubbing? My bike was shipped to me for some assembly; I heard that the disc brakes can be damaged in transit. I could see the wheel wobble when I took my first spin, and I could hear the mechanical disc brake rubbing at the same time. My powers of observation were not strong enough to tell if the two things were in sync.
could you maybe do a bike repair with budget tools :) thanks
All tools are the same in function. Just because Park mashes a tool that's $50 doesn't mean the same tool made by someone else for $12 isn't going to work the same way. Doing the job is the same always.
To a point. About 15 years ago I bought my first specific bike tool kit to start doing things like crank removal and BB service that are fairly bike specific. Icetoolz kit... And basically nothing has survived from that kit. The edges in the hex keys were too rounded in the common sizes (4-6), levers snapped, the prongs on the needle pliers were bent out of alignment, and so on. They did their job, but they were all gradually replaced with better quality tools. They don't have to be bike specific, but as the old saying goes only a rich man can afford cheap tools.
As for the original question - I think Henry had a video of all the things you can fit with a multitool. Not quite the same, but close. There's a lot you can do with a basic kit!
hiya guys , i know it's not a mountain bike.. but its more here than road.
I have a Cannondale Bad boy 1, had to go for the small frame as their standover heights were a bit tall,
everything is great, but i could really do with a longer stem to get super comfy, and this is my issue, i just cant seem to find stems that fit with the funky Lefty leg, any ideas please?
ps. if it could have a the handle bar fixing on the front that comes off too, as i really like riser bars too eg. my nukeproof sam hill
cheers guys :)
8:19 Thought for a split second Doddy started drooling badly there :'D
So, one of the bolts on my disc break has become cross threaded. This means it cannot be tightened on to the disc properly which now means that when the wheel spins I hear rubbing noise every two seconds.
Is there anyway to fix this because hubs are expensive.
If the bolts lose buy another bolt if its stuck on try glowing a cheap Allen key to the bolt and waiting over night then you should be able to undo it
I have to pull the brake lever regularly as bending the discs pushes the pads back in
What has me laughing is the thumbnail of the other video on why are my disc rotors bent
Doddy's face 😂😂😂
ruclips.net/video/Pl8N0Py1Jbw/видео.html
3:51 I've never tried that, but have been using an adjustable spanner for years. I've never marked the rotor, but when rotor is quite messed up I put it in the truing stand. I find it easier, more comfortable to work on it, and it's easier to get a good result.
I have Hope Floating rotors which perform well, but of course the rivets can get creaky after some years of use, but so far I haven't hit an rotor so hard I bent the spider.
I haven't tried one piece rotors on my new bike , I just went up in size, swapped front for rear and got 203mm at front but i won't go past that, I will just risk damaging the rotors.
I see some brands don't have floating rotors, for example Brake-Stuff, I see their lastet rotor has many small venting holes, but I don't know if it outperforms my rotors or not. they also offer 2.10 & 2.20mm rotors.
shop.brake-stuff.de/en/brake-discs/6-hole-is2000/75/disc-rotor-in-punch-design-6-hole-shimano-compatibel
They claim many small holes will reduce the wear.
Like to who so mantenchon in new #GMBN a thes. Disk Brakes Rotors in the #GMBNTech the #Moutainbiking thanks to hubliy video good joop. Saluds of chile 🇨🇱 🤘 😀 🤘
Is it normal or just my bad luck, that even a new rotor isn't perfectly true?
I think, never experienced to "fit and forget", Doddy mentioned in the beginning.
I tighten the rotor in a cross pattern, and make sure its exactly centered, before using the torque wrench. I look for an even amount of "meat" around each bolt head. Thats the hard part, seeing that its even all around
Hey
Would most riders notice the difference between a normal air shock and one with a piggyback or is it ploseabow effect
Placebo bro. And probably not, thats for more adjustment. I would notice, i like my suspension dialed in
Also you can use a bent rotor as a pizza slicing tool 😅😅
Once did it with a fork
I'm either going to love or hate this comment LOL
Best to buy new if you can
I think the same
I use a hammer. Just give it a good whack where it's out of true. You may need a hammer with a longer head to reach through the other side of the wheel. Just be careful not to miss or you could damage a spoke.
I must be stupid or something cuz now my hydros are completely messed up kms take it to the shop instead
if its not badly bent, try resetting your pistons/seals
How do you do this?
No issues with assembly for me ruclips.net/user/postUgkxHL1v1R3NE5x4KiYfyt8dnQmyNYz7qi5L but I could see where some might benefit from using an experienced bike assembler/mechanic. I'm an older rider starting back after a 10 year break. This bike exceeds my capabilities and has been easy to get comfortable riding. I'm mostly on easy trails with almost no street riding and have not been disappointed with the performance of the bike. My fitness level is far below what I previously rode with and because of that the mileage is going on the bike slowly. While I'm losing weight slowly, the bike seems to tolerate my 220 pounds just fine. The bike has been used by several family members ranging from 5'5" - 5'9".
I just bend them by hand lol
Couldn't get it to stop rubbing so i bent the rotor in temper. Silly me. Bikes can be an absolute pain in the arse at times😝🤢😅☺
Weirdest thing happened out of nowhere all my bolts fell off And my rotor got bent like a taco
Man I had an absolute mare with mine. I spent 2 hours swapping out rotors and all of them seemed bent.
I took it to Fin down a Full Factory and within 5 minutes he worked out it was the magnet (it’s an ebike).
He did some magic and I’ll post the insta link below.
instagram.com/p/CF99AaeHCrf/?igshid=12zoaahzjfx8h
Disc?
Am I the only person who just uses their hands to straighten their rotor?
Nope
nope, everybody does, it's a thing to hold the tools
Its better to get a feel for the steel before going h.a.m. on it
I do for small warps for sure. Almost always I start with fingers and then move to tools if that won't do it.
I was blown away when he pulled out an actual tool for the job. I've always used my bare hands. Learned how to do it without cutting myself real quick 😂
This is how this always ends ... ruclips.net/video/Z4fBbhyzE9A/видео.html
7:30 into the vid before he mentions that it wont work on centerlock...SMH
Christopher Creley only on the lower arms. You can still bend them at the edge
I just did it with an adjustable wrench on my center lock. Works like a charm man. What you cannot do is bend the aluminum arms if your disk has some. And actually shimano has a 6 bolt disk with those the RT86, so that also holds for those.
Another new tech, another dying wallet
You dont even need tools i fixed them with my hands
Or just buy a new disc
why dont you just get straight to the point... Im not dumb, if im looking how to fix my disc brake stop showing me other possible problems...