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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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 ...
4 votes
2 answers
564 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 ...
0 votes
1 answer
54 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 ...
4 votes
1 answer
373 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 ...
2 votes
0 answers
78 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, ...
9 votes
3 answers
3k views

Do mechanical disc brakes suffer from heat-induced fade?

The other day I read a question about heat induced brake fade in hydraulic disc brakes caused by too much braking on long, steep descents, which is something I have also experienced when cycling in ...
4 votes
4 answers
337 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 ...
0 votes
1 answer
248 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 ...
2 votes
6 answers
23k views

Alternatives for mineral brake fluid / oil (in a pinch)

In case you don't have 'original' bicycle specific brake fluid on hand (e.g. "Magura Royal Blood"), what might be a good alternative to use (in a pinch) in hydraulic (disc) brakes? (for brakes that ...
34 votes
1 answer
149k views

What is the difference between I.S., post, and flat mount disc brake mounting standards?

What is the difference between "I.S." (international standard), "P.M." (post mount), and flat mount disc brake mounting standards? Does one have a clear advantage over the other and is there a ...
4 votes
4 answers
874 views

Commuting and recreation scooter with handlebar brake lever

I am looking for a commuting / recreation scooter but have no experience of using one. I am very familiar with riding a bike and using handlebar-mounted brake levers. My budget is sub-£100 (GBP) and ...
16 votes
5 answers
2k views

When to change disk brake pads?

I was wondering how to tell when your disk brake pads need replacing. My front brake seems to be not stopping as quickly as it used to, or as quickly as I would like. I know this could be due to road ...
15 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 ...
4 votes
1 answer
367 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 ...
10 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. ...
12 votes
3 answers
18k views

When Should I replace the rotors on disk brakes?

I've probably done about 20k on the rotors I bought the bike with. They still work fine, but are visibly worn and slightly grooved from me not replacing the pads soon enough a few times. How do I ...
1 vote
1 answer
118 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 ...
5 votes
1 answer
3k views

Brake pads keep getting contaminated - how to diagnose?

(see updates at the bottom) My bike uses Shimano hydraulic disc brakes. I can't find any markings on the calipers or handles, but the manufacturer's website says they're BR-M315. Over the past few ...
7 votes
2 answers
13k views

Pros and cons of mixed hydraulic/mechanical brakes vs pure hydraulics

Title of question is self-explanatory. Recently, it was added to the market brakes that are an hybrid mix between the mechanical Bowden steel cable and hydraulic system, which their oil tank is near ...
63 votes
7 answers
202k views

Hydraulic Vs. Mechanical disc brakes

What is the difference between hydraulic and mechanical disc brakes? Are hydraulics more reliable? Or more powerful? I'm curious since, hydraulics seem to get more attention and seem to be on ...
3 votes
4 answers
566 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 ...
1 vote
1 answer
74 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'...
3 votes
1 answer
84 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 ...
1 vote
1 answer
524 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 ...
6 votes
3 answers
291 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 ...
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 ...
2 votes
1 answer
2k views

Replacement brake pads for Tektro HD-R210

What model pads would be a replacement for Tektro HD-R210 brakes? I haven't seen the model mentioned in Tektro's documentation https://www.tektro.com/upload/Product/F_20170613131999DtkdK8.PDF The ...
3 votes
3 answers
22k views

New Bike + Disc Brake Shuddering: Cause and Fix?

I recently bought a new bike (cx steel frame, carbon fork, disc brakes) that I am using as a commuter/all-rounder bike. My question is similar to questions that have already been asked concerning ...
5 votes
2 answers
4k views

Disc brake adapter too close to rotor

I've just bought a new (Planet X) Holdsworth Stelvio (http://www.planetx.co.uk/i/q/CBHOLSTELTIAG/holdsworth-stelvio-shimano-tiagra-4700-touring-adventure-bike) and am having a problem with the front ...
0 votes
0 answers
34 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 ...
2 votes
3 answers
275 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 ...
3 votes
2 answers
850 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). ...
13 votes
7 answers
37k views

Adjusting disk brakes after taking off the wheel

I recently took off the front wheel off of my mountain bike, and have been having considerably difficulty getting the front wheel on the right spot such that the wheel doesn't rub against the brake ...
0 votes
1 answer
63 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 ...
2 votes
2 answers
160 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 ...
1 vote
2 answers
211 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 ...
10 votes
4 answers
4k views

While on a ride, realised rear disc rotor was contaminated, what could I have done?

Last night, commuting, I got lots of dirty water all over my back brake (Promax Render-r mechanical disc), as well as on most of the rest of the bike, and me. I wiped the rotors with a clean rag to ...
0 votes
1 answer
392 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 ...
1 vote
4 answers
5k views

Why does a Shimano centerlock rotor have free play?

I have an electric road bike that has SM-RT64 Shimano centerlock brake rotor in the front. I have noticed that when I press the front brake and try to rock the bike back and forth, there's some free ...
3 votes
0 answers
277 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 ...
6 votes
1 answer
5k views

Why is my hydraulic front disc brake clicking?

I noticed that there's a mysterious click that seems to be tied to wheel rotation when riding my bike. It is barely audible when there's no traffic nearby. I initially assumed that it's a hub or the ...
14 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 ...
7 votes
4 answers
11k views

How to install flat mount road disc brake calipers on IS mount bike?

I have custom MTB frame and I bought a pair of Shimano Hydraulic road shifters. They have on Shimano BR-RS505 Road Hydraulic Brake Calipers Flat Mount when instead my frame takes standard IS 51 mount (...
4 votes
1 answer
77 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 ...
-2 votes
2 answers
576 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 ...
2 votes
3 answers
143 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 ...
6 votes
6 answers
10k views

Disk brake pads too thick?

I have an old Magura Julie disk brake. It seams that new pads are too thick for the brake. I already tried 2 different types. But when I insert the new pads the gap between the pads is completely ...
14 votes
4 answers
7k views

Front disc brake wobbling / grinding on pads after full braking and minor plunge

The front disc brake grinds after a light accident with full braking and plunge. To give an idea of the forces involved: The bike fell to the left, mostly cushioned by me. The bike had no more ...
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 ...
13 votes
1 answer
701 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 ...

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