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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34 votes
1 answer
148k 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 ...
RoboKaren's user avatar
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21 votes
2 answers
250k views

Converting bike from rim brakes to disc brakes

I just bought a used 2009 Kona Dew and it comes with regular rim brakes. I'm perfectly happy with them so far, but have been wondering if disc brakes would come handy when it rains. What is involved ...
Soo Wei Tan's user avatar
15 votes
6 answers
17k views

Why/How should I bed in disc brake pads?

Why should I bed in my disc brake pads and what's the best way to do it?
Martynnw's user avatar
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5 votes
1 answer
5k views

How do I get rid of the noise on my Hayes Stroker Trail brakes

I recently bought a new bike that came with Hayes Stroker Trail hydraulic brakes. From day one they were squeeky and not very grippy. I wrote it off to the burn in period that most disc brakes ...
Bizee Biker's user avatar
42 votes
6 answers
220k views

How do I separate hydraulic disc brake pads after pulling the brake while the wheel is off?

I take the front wheel off my mountain bike to get it in my car. When I get it out and try to put the front wheel back on, the space between the brake pads isn't wide enough for the rotor. Whoops! I ...
Phil Hale's user avatar
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22 votes
8 answers
61k views

Why do my disc brakes squeal when wet?

Picture the scene... It's just been raining and you are getting ready to commute home after work, you cycle out on to the tarmac, the scent of fresh rain on hot tarmac fills your nostrils, you notice ...
Wez's user avatar
  • 998
8 votes
4 answers
2k views

Total brake failure - trying to understand what happened

As I've mentioned elsewhere I recently had quite a bad crash - broken collarbone, shoulderblade, and a rib. The circumstances are rather unusual: both brakes failed totally. Crash details for those ...
Chris H's user avatar
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8 votes
2 answers
17k views

Disc brake break-in?

Just got a bike with discs (BB7). The feel of the braking is so-so on the first ride (5km commute from LBS to home). I think the cable for the rear needs a little tightening. But even so, I don't ...
Nic's user avatar
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7 votes
3 answers
45k views

How do I get my hydraulic disc brakes working well again

I just bought a new bike (my first brand new one ever) a few months ago and a while ago I decided to give it a wash and after that my front hydraulic brake hasn't been working as strong as it used too....
Falcon rider's user avatar
6 votes
2 answers
18k views

TRP HY-RD adjustment

Really struggling with these brakes now. Just installed new pads, but pistons won't separate far enough to put the wheels back in. Tried pushing the piston in using a plastic tyre remover, but no joy....
James's user avatar
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1 vote
1 answer
1k views

Adapt V-brakes bicycle to disk brakes

I've been thinking in changing my v-brakes to disc brakes. Now that my rear v-brake can't brake anymore I think that it is time change it. I've already seen this article. My frame is prepared for disc ...
Bruno Camarneiro's user avatar
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 ...
Wesley Crusher's user avatar
58 votes
18 answers
57k views

What is the practical advantage of disk brakes over rim brakes?

Disk brakes are becomming more popular on bikes now, and I was just wondering what the advantage is of this type of brake over the older rim brakes.
Connor W's user avatar
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26 votes
1 answer
40k views

What is the difference between different types of disc brake pads

I've seen several different descriptors for disc brake pads: Metallic, Semi-Metallic, and Organic. What is the difference between these types of disc brake pads?
Benzo's user avatar
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12 votes
4 answers
123k views

Hydraulic Disk brake piston not fully retracting

My front disk brake's piston doesn't fully retract. While I can ride the bike, the brake is slightly rubbing. (IE, if I just spin the wheel with my hand, it'll go around about one and a half times ...
Alex's user avatar
  • 323
11 votes
4 answers
14k views

Disc brakes squeak on Trek mountain bike

I have a Trek 3900 mountain bike with disc brakes, and I just took it out of winter storage to start riding it for the season. Everything works well, except for one very annoying problem: when I stop ...
Nate Koppenhaver's user avatar
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 ...
Chris H's user avatar
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10 votes
2 answers
26k views

Should rotors have no rub at all?

I just installed a new front disk brake and the rotor rubs a bit once per rotation. If I take the rotor off and place it on flat surface, it seems totally flat but once installed I can see/hear it ...
Alex's user avatar
  • 323
9 votes
3 answers
24k views

What are the negative consequences of not bedding in disc brakes?

It's common knowledge that disc brakes need to be bedded in. But I've never heard or found a description of what happens if you don't bed them in. Given the number of BSO's that now have disc brakes, ...
jimchristie's user avatar
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7 votes
1 answer
13k views

How do I bleed Avid Elixir brakes

My bike has a set of Avid Elixir R hydraulic brakes. The front brake barely goes on when I pull the lever and the back brake feels pretty soft. I think I need to bleed them. How do I go about doing ...
davefiddes's user avatar
7 votes
4 answers
9k views

Can disc brakes cause front quick-release to loosen?

I just purchased a Yuba Spicy Curry Bosch cargo bike with disk brakes and quick release skewers on both wheels. I haven't had any issues with it so far, in fact, I love riding it, but I have read that ...
SamA's user avatar
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5 votes
3 answers
8k views

Converting an existing cyclocross bike to disc brakes

I have a bike (Surly Crosscheck) that is used for commuting and cyclocross. As it's a bit older and disc brakes were not legal for 'cross until recently, it has cantilever brakes for optimal mud ...
bikesandcode's user avatar
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5 votes
2 answers
4k views

Disc brake pad and rotor compatibility

The SM-RT53 rotor should be used together with resin pads. If it is used with metal pads, the pads will wear out very rapidly. from Shimano BR M-416 disc brake manual How do I know if a rotor is ...
Vorac's user avatar
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4 votes
1 answer
6k views

Cleaning Contaminated Disc Rotors

I've had an eternal struggle with my current bike over brake contamination. The levers and calipers are shimano ultegra r8000, so the latest and (almost) greatest. I first noticed it when I took it ...
Axemasta's user avatar
  • 313
2 votes
1 answer
887 views

Disc brakes on leader doberman which has no tabs and adaptors

I have a leader doberman with a front disc brake that I want to install on the rear. I know that it hasn't a rear disc brake tab, but I have found an adaptor for the caliper (http://www.ebay.com/itm/...
stavros's user avatar
  • 21
97 votes
16 answers
30k views

Why are disc brakes rare on road bikes? (circa 2010) [closed]

Window shopping for road bikes, I can't see many that have disc brakes. What are the reasons for this?
user155695's user avatar
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30 votes
3 answers
56k views

Is there difference in quality for disc brake rotors?

I am on the hunt for new rotors for my mechanical disc brakes, as the old are too twisted now and the brakes can't be adjusted without the disc rubbing the pads. What is the difference between the ...
Vorac's user avatar
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24 votes
3 answers
8k views

How do I prevent disk brakes from squeaking in the rain?

When I got my new bike with disk brakes, I thought that they would perform much better in the rain. While this is true, they still squeak quite loud in wet conditions, which is quite annoying. Is ...
Nik Reiman's user avatar
  • 2,055
17 votes
2 answers
8k views

Hydraulic Disc Brakes Maintenance

I have Hayes Nine hydraulic disc brakes on my mountain bike. I have recently replaced the brake pads and after that it seems that the pads are almost touching the rotor. How can I adjust it? I have ...
kristof's user avatar
  • 941
10 votes
4 answers
4k views

Are rotor bolts designed to shear?

I was toying about with a disk brake for the first time and managed to shear two bolts clean off while reassembling. Curiously, both tore the head off, leaving the threadded shaft in the tapped hole ...
Criggie's user avatar
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9 votes
2 answers
858 views

How do I change my disc brake pads?

How do I change my disc-brake pads? How do I avoid letting the fluid out?
Johan Dahlin's user avatar
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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 ...
sergiol's user avatar
  • 402
7 votes
4 answers
21k views

How to clean disk brakes?

I want to clean my disk brakes and am wondering if it is sufficient to only remove the pads and use water & soap when washing the parts. If not, is there a list of stuff to avoid when cleaning ...
forgetaboutme's user avatar
6 votes
2 answers
2k views

What do I clean disk brakes with?

I know I need to keep the disks clean on my bike, but if I've got them covered in grease, what should I clean them with?
Scott Langham's user avatar
5 votes
3 answers
58k views

Can you put disc brakes on road forks originally intended for calipers?

I've decided I want a disc brake, at least on the front, which seems a good enough reason to go bike shopping, but am I overlooking the possibility of fitting a cable pull disc brake to my current ...
John's user avatar
  • 405
4 votes
3 answers
5k views

How to deal with long pre-bled brake line?

I bought and installed a set of pre-bled hydraulic brakes onto my bike to replace the mechanical discs that came with it. My future plan is to buy a new bike, transfer the brakes to my wife's bike and ...
DWGKNZ's user avatar
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4 votes
1 answer
2k views

Brand new disk brakes are barely stopping the bike

I just built a mountain bike with Avid BB7 brakes and Shimano V-brake levers. I used the exact same configuration on another bike, and it worked beautifully. But on this one, the brakes are just weak ...
Mike Baranczak's user avatar
2 votes
4 answers
2k views

Disk brakes severely reduced in power after replacing bearings

so I am creating a few posts about bearings and wheels, (story so far): how to reassemble mountain bike rear wheel hub and bearings mountain bike freewheel hub stopped rotating I have now got the ...
Jon's user avatar
  • 497
1 vote
1 answer
2k views

Shimano disc brake hose compatibility

I have a bike with Shimano XT disc brakes, model BR M775, which have too short brake lines for my new stem. So I want to replace them with longer brake lines. But when I go shopping for brake hose, ...
Kenned's user avatar
  • 597
1 vote
3 answers
4k views

How do I know what brake rotors to get for my bike?

In the next month or so I plan on getting the 2019 Trek Crockett 5 as a cyclocross/road bike. I will also be getting some nicer road wheels for the bike so I can swap out the wheels whenever needed. ...
Nate Perronne's user avatar
1 vote
4 answers
4k 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 ...
juhist's user avatar
  • 18.5k
0 votes
1 answer
3k views

Steel (531) road bike conversion to disc practicability

Are the stays on an old PX-10 frame (531) sturdy enough for disc brakes? I ask this, because this frame has nice, wide stays for wide rims and tires for use as a bad-weather bike. I would consider ...
Bary's user avatar
  • 9
-7 votes
2 answers
250 views

Why did my 28-spoke front wheel lost all tension but rear only some?

I have an electric road bike with disc brakes. Its stock front and rear tires have only 28 spokes and a slightly deeper than ordinary rim. The hubs are cheap non-Shimano hubs, but their flange ...
juhist's user avatar
  • 18.5k
27 votes
10 answers
32k views

Is having your hands "on the hoods" of drop handlebars safe for braking?

I've never had a bike with drop handlebars, but may get one for commuting in busy London (likely a single-speed with mechanical disc brakes). This would mean riding with my hands mostly on the hoods, ...
Baumr's user avatar
  • 1,585
23 votes
8 answers
67k views

6-bolt vs centre-lock: pros and cons?

I am having a new set of wheels built, and am trying to decide on whether to go with 6-bolt or centre-lock rotor interface. What are the pros and cons of the two systems?
NPE's user avatar
  • 639
22 votes
5 answers
101k views

How often should hydraulic disk brakes need bleeding?

The brake handles for my disk brakes became very loose four months after I bought the bike. The bike shop bled the brakes and put new oil in them, which sorted it. They're feeling a bit loose again (...
Richard's user avatar
  • 579
17 votes
4 answers
15k views

What causes my front wheel to twist when I apply the brake?

I have a 2005 Specialized HardRock Sport with disc brakes. When I'm slowing down from a reasonable speed with the front brake, I noticed that the top of the front wheel appears to deflect sideways ...
Jay R.'s user avatar
  • 273
17 votes
4 answers
6k views

Accident from front wheel locking up on brand new bike

I purchased a brand new hybrid bike with mechanical disk brakes a few weeks ago I have ridden the bike for a few weeks without any issues on city streets with potholes and elevations from bridges I ...
Help's user avatar
  • 171
15 votes
5 answers
7k views

What type of brakes are best for mountain bike racing?

Disc brakes are more expensive than v-brakes, but in a heavy rain they will break down. V-Brakes are becoming harder to find, but they're much easier to maintain and don't break down as easily. What ...
Johan Dahlin's user avatar
  • 2,888
13 votes
4 answers
5k views

Separate hex keys vs. combined multi-tool for bike adjustments?

Are separate hex (Allen) keys better than a multi-tool for adjusting and maintaining a bike at home? Some of the separated sets also have ball-ends for the 4/5/6mm keys: Apart from Torx T25 screws ...
Baumr's user avatar
  • 1,585