Brakes with a disc near the hub and calipers that grip that disc.

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66 views

How much runout is acceptable in a disc brake rotor?

I'm trying to sort out pad dragging / noises in Avid BB-7 mechanical disc brakes and I'm wondering how much runout in the rotor is acceptable? Right now I have about 0.05 mm (measured with a Park ...
2
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0answers
66 views

Troubleshooting Noise from Avid BB-7 Road Disc Brakes

I'm trying to track down a dragging sound from some Avid BB-7 brakes on a Kona Sutra. The hub is a Shimano Alfine DH-S501 dynamo hub with an SM-RT82 Centerlock disc. The noise sounds like a dragging ...
3
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2answers
41 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 ...
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1answer
31 views

What can my Shimano BR-M445 caliper be replaced with?

I have a Shimano BR-M445 disc brake caliper that has decided to give up on life, so I need a replacement. It seems like the BR-M445 is no longer produced, so are there other calipers that can replace ...
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1answer
69 views

Moaning Disc Brakes?

My Disc brakes have been shuddering all day (been riding most the day). And when I say moan, I mean like I can feel the bike shudder up to my rear end. I tried the trick where you rub mud on them and ...
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2answers
48 views

How do I get the pads out of my Avid BB7 disc brakes?

I have never been able to remove the pads from my Avid BB7 brakes. It seems to take too much force to get them out, I figure I missed a step somewhere, or I'm doing something wrong. I can't figure it ...
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3answers
88 views

My rear disc brake makes noise when I ride fast

I have a full suspension mountain bike with disk brakes. When I ride fast, my rear disk brake starts to make a noise similar to the one you would hear when sharpening a knife. It happens when I ...
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0answers
53 views

How do I get rid of weird rubbing noise on my cx bike?

Recently I got the Giant Revolt 3 and have been riding it for a few days now. I have lately noticed that there is some rubbing noise when I apply the brakes. If you look at this picture (might be a ...
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1answer
36 views

Pads in contact with disk when idle on my SLX L675 disk brakes

I've recently bought a Nishiki Hyper pro which features the hydraulic Shimano SLX L675 brake system. What I've found is that the pads on the back wheel breaks appear to be in constant light contact ...
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1answer
124 views

What can cause disc brakes not to react after keeping/moving the bike upright, then recover?

Recently, I experienced a strange situation with the Tektro hydro disc brakes on my hybrid bike (would the model be helpful here?): I carried it upstairs at a friend's place, and later moved it ...
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2answers
91 views

When I pull my disc brake handle the mechanical caliper will grab then release

My rear disc brakes will grab a little then release all together. I had tightened by cable at the brake handle so I loosened it but it still does the same. It is a Trek mechanical disc brake.
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2answers
73 views

Can an imperfect hub make a disc rotor rub?

I had a 160mm disc rotor on a road bike that was rubbing a bit in one spot, not severely, but enough for me to notice. I've tried to true it a few times over the past couple months with little ...
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1answer
106 views

Should disc brake rotors be removed when packing bike for travel?

I've been looking at a few tutorials on packing a bike to take it on a plane, and most of them make no mention of disc brakes. One did specifically mention disc brakes, and recommended taking the ...
2
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1answer
141 views

Brake hard on new cycle

I saw someone after buying a new bicycle (a hybrid), pulled the brake as hard as he could for few seconds and dragged the cycle along while braking like that, 1 brake per centimeter. Why did he do ...
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3answers
81 views

What are the securing rings on the disc brake pads pin called?

I've misplaced mine, and noticed the other caliper doesn't have the other one. How important are these? I mean, do pads fail or come loose at times, without these safety feature present? Is it ...
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1answer
110 views

Are my disc brake pads contaminated?

My rear brake never locks the rear wheel even with full pull on the lever, especially going down hill or fast. I can even pedal a bit with the brake depressed. This is a recent issue and sometime in ...
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1answer
270 views

Should brake fluid come out of a misaligned disc caliper piston?

I have a shimano XT hydraulic disc brake system. While servicing it I took out the pads an checked the pistons in the caliper and noticed that only one is extracting. After a few pulls on the lever ...
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2answers
92 views

Removing and reseating front wheel makes disc brakes rub

I have a brand new bike with Hayes CX Expert disc brakes. When I picked it up at the shop, they had dialed the front brake in nicely so it grabbed pretty quick (i.e. without having to pull it right to ...
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1answer
119 views

Rear disc calliper won't fit, disc mount bent?

I am upgrading my MTB to disc brakes. I have disc compatible wheels and a set of Shimano M446 Postmount callipers and 160mm rotors. Front fork is a Manitou who decided to jump on the Postmount wagon ...
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2answers
137 views

to install disc brake

Hi friends I have a hercules roadeo a100 and I want to install a disc brake to it. It comes with a disc brake in front and v brake in rear. So can I install a disc brake to it and how much it costs.
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1answer
166 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 ...
3
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0answers
101 views

Shimano Hydraulic disc brakes- Lever compatibility

I am looking for practical advice on compatibility between various Shimano hydraulic disc brakes, especially the lever assembly. Currently I have two separate sets, one M446 Left lever, attached to a ...
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4answers
1k views

Is having a disc brake on a single speed bicycle a bad idea?

I talked to a bike shop that sells a lot of fixed/single speed bikes. I asked them if they could sell me a single speed with a disc brake on the front. The guys said no because: It will be hard to ...
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2answers
116 views

Front wheel compatibility

I have a pretty cheap bike (29" Genesis Two-Nine) which served me very well for 2 years and now the front wheel got stolen. Are front wheels universally replaceable and if yes, what are properties ...
0
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1answer
100 views

Want a snappy scrambler for stumptown

I live in Portland, Oregon and I need a bike to ride to work. It's about five miles, with one steep but not long hill. I used to have a track bike with a freewheel that was really nice for Salem, ...
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1answer
179 views

Do Shimano disc brakes need post mount spacers?

I am switching my rear Avid Elixir brake for a Shimano XT one, but I am a bit unsure about mounting the caliper. The Avid brakes had spacers that put the brakes in the right position for the 160 mm ...
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3answers
218 views

Hydraulic disc brakes - total friction as a function of rotor size

I have a hydraulic disc road bike with a 160mm rotor on the front and a 140mm on the rear. The setup is exactly the same front to rear, except for rotor size. I'd like to know the disparity between ...
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4answers
204 views

Are rusty disc brake pads a worry?

I'm the fool who didn't wash the snow off his bike - it's a rusty mess. I've just taken apart the front disc brake as it was rubbing. I think that was more to do with the disc being bent, but as I ...
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1answer
187 views

What does this piece do that came with my disc brake?

I recently ordered hydraulic Shimano disc brakes with rotors and they came with a bunch of hardware, including this piece: It looks like it would fit under the screws that secure the rotor to the ...
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5answers
145 views

Persistent front wheel squealing: Replace the fork? Switch to disk?

I have a Cannondale touring bike from the early 2000s that I use as my daily commuter. With the stock cantilever brakes and original front wheel, I had a lot of front brake squealing. I did the ...
2
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1answer
135 views

How to remove existing fluid before bleeding disk brake

I've found lots of tutorials on how to bleed the disk brakes. And in all of them there is nothing about removing existing fluid. I'm quite afraid that when I start to bleed brakes the existing fluid ...
2
votes
2answers
312 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, ...
2
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4answers
758 views

Can I install caliper or cantilever brakes on a frame and set of wheels designed for disc brakes?

I have a 2008 Giant XTC 01 that came with disc brakes. Those brakes have been difficult to service throughout my time with the bike, now the pads on the back are worn out the fluid lines on the front ...
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1answer
122 views

Disk brake wheels - multiple wheelsets

I have a cx bike with disk brakes. I bought a second set of wheels to run road tyres while not off road. On my road bike there's always a minor adjustment to make to the brakes when changing ...
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5answers
1k views

Disc brakes better for rainy days?

Are disc brakes more effective on rainy weather? I had a close call riding my road bike during a morning rain and almost collided with a parked car. My road bike is steel and has tektro branded ...
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1answer
624 views

My back brakes don't lock the wheel (skid): feature or a bug?

When I apply rear brakes only (I know this isn't the proper way to stop), it slows me down but never locks the wheel to the point of skidding (on dry pavement anyway). This is a new 'cyclocross' style ...
2
votes
1answer
91 views

What are the 'parts' to a mechanical disc brake set?

So there are rotors, pads, brake lever, brake cable...I just want to make sure that if i buy brakes I can get all the parts and I'm not missing anything.
3
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3answers
566 views

Is it safe to mount fender stays and disc brakes on the same bolt?

I bought these fenders recently: The rear fender works fine — there are enough mount points to support my brake, kickstand, rack, and fender. But when the salesperson sold me the fenders, we ...
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2answers
478 views

Front disc brake noise only at high speed

At a high speed (about 50km/h, but not sure exactly, as I don't have a speedometer) the disc starting to noise like it is touching the caliper/pad. At low speeds It doesn't noise and it's rotating ...
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0answers
52 views

Disc brake lines quite long [duplicate]

Currently building a new mountain bike. I'm fairly bike savvy and have built quite a few bikes over the years, but mainly road bikes. I have installed/fitted a new Shimano slx group set and the ...
0
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2answers
113 views

Cross bike brakes

I am looking at cross bikes to keep me cycling through the winter. http://www.nicholsons-cycles.co.uk/product/focus-bikes-mares-cx-3-0-disc-105/49669 I like this but am worried about the brakes - I ...
3
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4answers
3k views

Buying first hybrid bike; better to put $ into components or disc brakes?

I'm looking to replace my 2008 comfort cruiser with a fitness style hybrid. My budget allows for maxing out at $500 (on the new fitness hybrid bike itself). I ride rails-to-trails with the kids, ...
2
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2answers
785 views

How do I mount this Topeak rack onto this road bike with disc brakes?

I've browsed several closely related questions already, but haven't found one quite like my issue yet. I have the following rack, a Topeak Tourist for Disc Brake bikes (with a matching Topeak trunk ...
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2answers
172 views

Adjusting disk brake positions

I recently got a new bike (below). It's rather latest technology for me. I got it assembled from a supermarket, but had to do almost all the adjustments myself. I don't know what I did wrong with ...
3
votes
2answers
930 views

Can disc brakes be considered safe for road group rides?

I know aero bars are considered unsafe for peloton, does this extend to disc brakes whose rotors can be hot and sharp? I'm not talking about races, just casual training rides: is it reasonably safe ...
2
votes
1answer
270 views

Is it a good idea to sand off the rotor when exchanging disc brake pads?

During operation, disc brake pads cut grooves into the rotor. When replacing the pads with new ones, would it be a good idea to smoothen the rotor with sandpaper(e.g. grit 200 then grit 800)? What is ...
4
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3answers
4k 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 ...
4
votes
1answer
1k views

What do I have to know, to replace my hydraulic disc brakes with new ones?

I want to buy a new hydraulic disc brake for my old mountain bike, which already has a disc brake. As I am very far away from any bicycle shop I want to buy the parts on the internet. The shipping ...
5
votes
2answers
180 views

Disc brake maintenance

For some days now I am observing the decreasing performance of my disc brakes on my MTB. Additionally, braking is extremely loud (squeaking). I don't think I have oil or fatty substances on the discs. ...
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4answers
239 views

Do these pads look contaminated?

These are the front brake pads of my bike. Lately I've seen a decrease in stopping force and some shudder when braking at low and very low speeds. I took them apart and they look like this: Do ...