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Questions tagged [disc-brake]

Brakes with a disc called a rotor near the hub and calipers that squeeze pairs of pads against that disc.

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How to diagnose and fix a mechanical disc brake rotor that is bent without a tool

I have a 2022 GT Aggressor with mechanical disc brake rubbing on the rear wheel. I tried realignment of the caliper several times and I got the wheel trued. But my brakes still rub ALOT! There is only ...
Alison's user avatar
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0 votes
2 answers
44 views

brake rotor offset inconsistency

I previously ran a promax 160mm rotor with a BB7 avid brake caliper. My rotor is spent and is not braking correctly. The tech suggested I used a Shimano ice-tech disk. It seems to me that, relative to ...
AdamO's user avatar
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1 vote
1 answer
65 views

Brake problems (need adjustment too often)

I've been having problems with my bicycle brakes for not a short time and I've been having it with a couple different bikes. The brakes get loose after 1-2 weeks. I deliver with my bike so I use it 50-...
Artin's user avatar
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1 vote
1 answer
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I can't unscrew the rotor bolts

I have a torx screwdriver but it wasn't meant for bike maintenance use. Actually I had bought it to unscrew the bolts of my owen. However, it sits firmly on the bolts of the rotor but can't unscrew ...
Ender's user avatar
  • 1,950
4 votes
1 answer
109 views

Changed the disc brake rotor, now wheel doesn't spin?

I have replaced the tire and the disc brake rotor on my rear wheel and since then for some reasons my rear wheel does not spin. When I take off the disc brake rotor it freely spins: https://vimeo.com/...
Mat's user avatar
  • 809
4 votes
1 answer
91 views

How to temporarily plug hydraulic brake hoses to route them through frame without leaking fluid

Is there a way to temporarily plug and seal hydraulic disc brake hoses as well as hydraulic dropper post hoses, before installing them or removing them from a frame? The idea is to keep things tidy ...
North Krimsly's user avatar
4 votes
2 answers
618 views

Disc Brakes disengage when braking, why does this happen?

I have a fairly heavy e-bike and I'm a fairly heavy rider. My bike has mechanical disc brakes, and around 5 months ago I was having an issue where the brakes became useless, as in when I applied them ...
John Tracey's user avatar
5 votes
1 answer
397 views

What is the difference between lower end and higher end hydraulic disc brakes?

I have some mechanical disc brakes on a gravel bike that I find almost completely useless at stopping. I tried replacing them with better cable-actuated hydraulic brakes that were widely recommended ...
senten's user avatar
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2 votes
0 answers
85 views

Are wheels designed for a maximum disc/rotor size?

I'm looking at some new wheels which Shimano describe as "140 mm disc brake rotor compatible". Does this mean they can't handle larger 160mm rotors? If not, why would they make this point, ...
WornChain's user avatar
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0 votes
1 answer
55 views

Bike Friday Pocket Llama and Magura MT Trail Series 2

I'm new to disc brakes and today I tried to fit a Magura MT Trail Series 2-piston brake to my Bike Friday Pocket Llama frame. However, although I'd be able to attach the caliper to the frame, it does ...
Stücke's user avatar
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4 votes
4 answers
391 views

How to prevent disc brake caliper from slipping while tightening caliper mount screws?

While adjusting disc brakes, I often find that the caliper body slightly slides sideways when tightening the mounting screws. It is sometimes due to sticky washers, but I also encounter this issue ...
le petit prince's user avatar
4 votes
1 answer
445 views

Is it OK if pads overhang the rotor?

I have the NCM Moscow 27.5 that since purchase has always showed this issue, that is the rear rotor isn't in total contact with the pads when breaking. The company said this is not an issue but a ...
Sandro Antonucci's user avatar
14 votes
4 answers
2k views

Is this brake mounted incorrectly?

A friend of mine just got her bike back from the store after getting new brake pads, a new fork and a new cassette. After riding a few meters I noticed a weird behaviour while using the front brakes ...
andii1997's user avatar
  • 315
9 votes
3 answers
2k views

What is the purpose of bedding in disc brake pads? And what if the procedure is not followed?

When installing new brake pads for disc brakes, manufacturers recommend to "bed in" the pads. For example, Magura recommends to go 30kph then brake hard and repeat this process 30 times. ...
Rеnаud's user avatar
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1 vote
1 answer
131 views

Extractors for Centerlock rotors and Shimano HG cassette

I need to buy some basic tools to do some maintenance on my wheels, but I'm confused about what I need. I want to perform the following operations: change the cassette I have a 11-34 10-speed ...
larsen's user avatar
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3 votes
4 answers
575 views

How do you keep disc brakes on internal hubs aligned with the caliper?

I'm contemplating building up a new commuter bike, and I'd like internal gearing and disc brakes. Internal gears require horizontal dropouts. Disc brake rotors however must be aligned with the caliper ...
generic_user's user avatar
3 votes
1 answer
85 views

Fore/aft adjustment of disc brake

I have a bike frame that can be run as a geared or single speed bike. It has horizontal rear dropouts to adjust wheel position to tension the chain when run as a single speed. It also has slots for ...
tir38's user avatar
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1 vote
1 answer
747 views

TEKTRO Road Bike Mechanical Disc Brakes MD-C550 Pads

About TEKTRO Road Bike Mechanical Disc Brakes MD-C550 pads I search the internet for replacement and all results shows the model: E10.11 and in the compatibility chart it does not for the MD-C550 ...
Emadness's user avatar
4 votes
1 answer
1k views

Can I sand the disk of my diskbrakes?

Is it ok to sand it? I would like to remove the excess black scratches that the bad brake pads have probably created on it, together with some black mucus or something. I am not sure where the black ...
Vladimir Despotovic's user avatar
0 votes
1 answer
357 views

SRAM force axs brake judder/shake/vibrate

I have problem with my SRAM force axs brakes, I bought new disc brake rotors and as well brake pads, cleaned it all changed it, but yet when I brake it just totally judders or vibrates it just doesn’t ...
Natalie G.'s user avatar
1 vote
1 answer
75 views

Loud squeal from front wheel - mechanical disc brake, QR axle

Been very frustrated with this. On my genesis croix de fer (less than 1 year old) I get a squeak or squeal that gets progressively worse as I ride. Particularly when going over rough ground or when I'...
Ally M's user avatar
  • 81
6 votes
3 answers
385 views

What are the failure modes of the brake rotor worn beyond limit

Background I have been maintaining two bikes for a few years. Both have disk brakes. One has around 10 000 km on it another one is well over 35 000 km. The disks on the bike with 35k+ are now reaching ...
Art Gertner's user avatar
  • 2,597
0 votes
0 answers
36 views

Front wheel making a tick noise with each rotation ans the wheel does not run freely when spun by hand, stops soon after the click noise

I just bought a new Triban 500 from Decathlon. During the first ride I noticed a click sound with each rotation of the wheel (sounds like a car indicator being on). When I spin the wheel by hand it ...
Tony's user avatar
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3 votes
2 answers
1k views

Compatibility of hydraulic disc brake levers with mechanical disc brakes

I have a mid-2000's MTB project bike where I changed the 3x drive train to a 1x. However the original shifters were integrated with the brake levers (Shimano BR-M465 with Shimano ST-EF35 EZ Fire STI). ...
mapface's user avatar
  • 197
0 votes
1 answer
64 views

Retromod: where to find rigid 26in fork for disc brake?

looking to replace my 90s Marin rigid fork (canti) for on with a caliper mount for disc brake. The closest I found was this but it is hi-ten. Also I am not sure why they drilled a hole at the junction ...
tweedi's user avatar
  • 587
2 votes
2 answers
167 views

Routine maintenance and cleaning of road and MTB disk brake pads and rotors

When I brake on a road bike I feel staggered braking—similar, but much lesser in amplitude yet higher in frequency, to what you'd feel when ABS brakes engage in a car. When I brake on an MTB, I ...
Sam7919's user avatar
  • 9,132
1 vote
2 answers
257 views

Purpose of fittings at the bottom of suspension fork?

I have a question about the suspension fork on my mountain bike. There is a hex socket at the bottom of the right fork leg. There is a normal bolt head at the bottom of the left fork leg. Are these ...
richard greaves's user avatar
0 votes
1 answer
480 views

What are the exact dimensions of Shimano disc brake split (cotter) pins?

What are the exact dimensions of Shimano disc brake split (cotter) pins, such as part nr. 25 (Y8DB06100) on BR-MT410 caliper (https://si.shimano.com/en/ev/BR-MT410-4663)? Looking to buy generic ...
Nik Kharlamov's user avatar
3 votes
0 answers
324 views

Shimano road bike lever leaking mineral oil

I have a leak in my Shimano DA 9170 (right) shifter. When I do a bleed, everything seems to work for a ride or two and then I start to lose braking power and the underside of the brake hood is wet ...
learnedhypothesis's user avatar
4 votes
1 answer
79 views

Front wheel (Fulcrom 418 DB) not spinning when tightened

This is regarding Fulcrom Race 418 DB as delivered originally on a Bianchi XR3. Probably used for 5-6000 km. Last week, I went to Belgium for some cobblestone riding in terrible weather. Returning ...
Odd N's user avatar
  • 41
13 votes
4 answers
3k views

Disk brake cables wear out too often - can I do something?

I have bought a City Bike Elops Speed 900 a year ago. I noticed that the disk brake cables wear out way too often. It happens sometimes only after a few hundred kilometers of use. They are torn at the ...
bud.dugong's user avatar
-2 votes
2 answers
631 views

What is the ideal ratio of front to rear wheel spoke count (disc brake)?

What is the best[1] ratio of front wheel spoke count to rear wheel spoke count on a disc brake bike? For the vast majority of bicycles that are commercially available this ratio is 1: 32/32 for ...
aehhhhmm's user avatar
2 votes
2 answers
1k views

Bleeding Promax Decipher Hydraulic Brakes

I have a Promax Decipher Hydraulic Rear Brake on a bike I am trying to repair, but no idea how to bleed the brakes. I have tried to find something out there in internet land but the two videos I found ...
Brian B's user avatar
  • 21
2 votes
3 answers
154 views

Disk brake caliber/fork compatibility

I bought a cheap 28" steel fork to replace a rusted 26" suspension one on an old Trek MTB for my kid. The geometry looks good, but I can't align the the disc brake caliper properly. The pads ...
Panmanp's user avatar
  • 31
13 votes
1 answer
842 views

Do "durable" brake pads accelerate the wear on the rotors?

When I bought my fun bike, the standard pads were B01S. Then a bit later, Shimano released B03S, that was touted as "40% more durable than B01S, with the same braking performance", and ...
Rеnаud's user avatar
  • 20.4k
0 votes
1 answer
421 views

Why is there no pressure in brakes after leak?

I made a mistake when trying to align the caliper to correct for the disc rubbing against the brake pads. Instead of unscrewing the bolts mounting the caliper body to allow adjustment, I unscrewed the ...
lost_M's user avatar
  • 1
3 votes
4 answers
929 views

Bike mechanic can't fix my brakes

Every caliper or V-Brake bike I have ever touched had fully functional brakes. Even if the pads were completely run down and steel was rubbing against the aluminum rim, if you applied enough pressure ...
AzulShiva's user avatar
  • 1,468
16 votes
1 answer
3k views

Why are disc brakes (disc & caliper) always installed on the left side of the bicycle?

When reading the question Front tire and downtube are extremely close, I realized that disc brakes (referring to the assembly of brake disc and caliper, not the brake levers) are always installed on ...
sleske's user avatar
  • 2,319
10 votes
2 answers
2k views

Do we need to repeat the bed-in process for disk brakes after replacing only the pads?

I know that we need to go through the bed-in process when installing a new disk, but what about when changing only the pads? Technically, the surface of the disk has already been prepared with the ...
olliebulle's user avatar
  • 4,119
1 vote
1 answer
137 views

Should I clean the mechanical disk brake rotors on my new bike

New Bike Day for me tomorrow! It's the first time I will have bought something like this. I have heard some places to leave everything alone until a problem starts, and I have also heard that you can ...
kunoichi9's user avatar
-1 votes
1 answer
91 views

Mechanical bike disc brake caliper lever

Where can I find a data sheet for this part? I want to know if there is a magnification factor between the force which acts on the disc brake by pads, and the force that I pull the wire with, as I ...
المهندس محمد جابر's user avatar
2 votes
3 answers
340 views

How long do new rotors take to break in?

I mounted new rotors a week ago, and today they make a crunching noise just as terrible as on day one. It's a sound that makes you think a small rock is stuck between your pads, except there isn't. I ...
MaxD's user avatar
  • 854
4 votes
2 answers
373 views

Can i adjust Avid Elixir R SL hose angle without bleeding?

I would like to adjust the angle of the brake hose coming from the caliper. I think this can be done by moving this part which should is called banjo i think. I would imagine I would need to loosen ...
KarelPrdel's user avatar
7 votes
5 answers
262 views

Braking system conversion for Pashley Cargo Bike

I've picked up a Pashley Classic No.33 cargo trike and am turning it into a coffee trike. Once I've got an extra 120kg + my weight on there I'm aware I'm going to need a pretty good braking system. It ...
Jeremy Daubeny's user avatar
9 votes
1 answer
488 views

Bleed or flush old oil before brake removal and storage?

I'm about to replace my stock Shimano BR-MT400 hydraulic disc brakes. The cables are external. I think I have a sense of how to install, bleed and bed-in the new Maguras, but is there some best ...
parisminton's user avatar
4 votes
2 answers
344 views

Is it normal for resin brake pads to contain small amounts of metal?

I just bought these brake pads from amazon (the resin variant, NOT the semi-metallic variant, see picture), and even though they are supposed (?) to be non-metallic, I can see small amounts of a ...
MaxD's user avatar
  • 854
3 votes
3 answers
682 views

What limits the rotor size in flat-mount brakes?

Let's consider Shimano BR-RS305 caliper. The only numbers which are floating around are 140 mm and 160 mm for the rotor. My question is -- what stops this caliper from using 180 mm or bigger rotor? ...
greenoldman's user avatar
  • 2,064
0 votes
1 answer
103 views

Which Banjo bolts do I need for Zee M640 calipers?

I've just ordered a set of Zee M640 calipers to replace the old BR-M596 2 piston calipers on a bike I bought recently. While looking for other parts I need I noticed that the calipers don't come with ...
McDoof's user avatar
  • 1
4 votes
1 answer
242 views

Is it reasonable to run a cable actuated disk brake on a Cannondale CAAD13 disk frame?

I am planning to run a cable actuated hydro disk brake on a CAAD13 frame, but my bike mechanic said that it might not be possible because of how the rear brake hose runs below the bottom bracket on ...
AshlavaPak's user avatar
2 votes
0 answers
99 views

Can't seem to quiet my disc brakes

I recently purchased a bike that clearly needed fixing, for a great price. I've given the bike a bit of a tune-up, but one thing that won't seem to go away is the squealing sound coming from the disc ...
Brannon's user avatar
  • 121

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