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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1 answer
37 views

Mechanic disk brake hose length for trials

I have an Avid BB5 front disk brake on my 20" trials bike, and when I bought it from a shop that claims to specialize on trials bicycles, it had a pretty long front brake hose (80 cm/30"). ...
5 votes
2 answers
349 views

Disc brakes sometimes sing

Sometimes my front disc brakes on my mountain bike "sing" when I am NOT applying them. The pictures show there is a space between the pad and the rotor. It can get irritating. Is there some ...
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7 votes
1 answer
96 views

Is there data on increased wear when using resin only rotors with sintered pads?

I'm after hard numbers here, not woolly descriptions. Of course it will vary with riding conditions, but I can extrapolate from numbers and not vague words. I always use sintered pads in the BB5s on ...
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1 vote
1 answer
64 views

Role of a mysterious clip on a front brake caliper screw [duplicate]

I was doing some fork maintenance the other and noticed a strange clip that is mounted on one of the screws used to attach the caliper to fork. The pictures below show the clip in question. It really ...
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4 votes
5 answers
174 views

Why are my disk brakes making a squealing noise?

I recently found a bicycle used by a relative which seemed to be in good shape. However, I found that the hydraulic disk brakes make a loud squealing sound towards the end of the stopping distance. ...
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5 votes
1 answer
642 views

Is a bit of disc brake rubbing normal? [duplicate]

I bought a new roadbike with shimano ultegra hydraulic disc brakes. After I rode a couple thousands km, my disc brake pads started to rub the rotor, but just a little bit (it barely touches it, I can ...
  • 571
3 votes
2 answers
187 views

Immense difficulties bleeding a shigura setup

I set up a shigura system with BL-M8000 levers, MT5 and MT4 Callipers and Magura hoses and shimano parts on the lever end. But I couldn't get even a decent bleed on them. I tried a couple of ...
3 votes
1 answer
341 views

Did I mess up my front brake pressure?

My Bike: Ghost - HYBRIDE KATO 3 AL 29 The first problem was that my front brake disc grinded on the brake. I tried to adjust the brake -> didn't work Then I replaced the braking pads which also ...
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1 vote
2 answers
52 views

What driver body and disk brake compatibility is important for setting up a rear wheel?

I'm looking at a wheelset which comes with either a Shimano or XDR driver body option. So I assume that has to be compatible with the cassette, but does the cassette also have to be compatible with ...
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1 vote
1 answer
429 views

Upgraded options for Tektro MD-C550 mechanical disk brake?

I just got the new All City Space Horse Tiagra and absolutely love it. Only downside so far is the brakes. Stock brakes are the Tektro MD-C550. I've had good hydraulic disk and great v brakes in the ...
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5 votes
2 answers
79 views

Brake or Wheel Click under braking

I have a clicking from my rear wheel (sometimes in the front too), when applying my brakes. Sounds similar to a aluminum can tab being snapped, or can being flexed. Product Brand Model Caliper ...
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2 votes
1 answer
81 views

How do I fix an Avid BB7 Outboard Pad that Doesn't Retract?

A friend came by with a Bike Friday with a rear BB7 disc brake that no longer worked at all. The adjustment was way off, a result of the undiagnosed fact that the outboard pad wasn't retracting ...
4 votes
2 answers
620 views

Which tool to remove a Shimano Center Lock brake disc?

I would like to change my brake disc. It is a Shimano SM-RT10-M that I will switch with this one: https://www.probikeshop.fr/disque-shimano-rt30-center-lock-argent/159249.html I don't have the tool ...
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3 votes
2 answers
209 views

Why aren't mechanical disk brakes self-adjusting?

Hydraulic disk brakes usually adjust for pad wear via special seals that allow the pad to "creep" closer to the brake disk as they wear down. It seems that such seals could equally well be ...
2 votes
0 answers
45 views

Does (or has in the past) an adaptor existed to mount a disc rotor to a Shimano Rollerbrake type hub?

I have acquired a Nexus 8speed rear hub. It’s a good one and I’d love to use it. However, it has been set up to use rim brakes and under the plastic cover is the interface to mount a rollerbrake. Does ...
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1 vote
0 answers
129 views

How do hydraulic interrupter brake levers work?

It has come to my attention that interrupter-style levers are available for hydraulic brakes now. By interrupter lever, I mean those levers which can be mounted to the same cable on an alternate ...
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13 votes
3 answers
2k views

Are brake calipers directional?

I'm interested in putting a discs brake on the right side of a bicycle. The goal is to have dual front discs, similar to how motorcycles often use double front brake discs. I can buy or make a custom ...
  • 3,197
2 votes
1 answer
126 views

Wheel not straight in dropouts - can this cause brake rub?

My front wheel is not straight in the fork dropouts. It's been like this since I've bought the bike second hand a few years ago. See pictures below. I've tried installing an identically sized wheel ...
  • 377
1 vote
1 answer
75 views

Shimano SM RT800 rotors on BR-RX400 brakes

I just want to make sure that I can put the Ultegra ice-tech 160mm rotors on my gravel bike that currently has BR-RX400 brakes and SM-RT70 CL rotors. On Shimano website https://productinfo.shimano.com/...
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4 votes
2 answers
714 views

How to restore broken rear disc brake mount in carbon frame?

Look at the image: Bike model is Rocky Mountain Vertex 990. The frame is broken in a way that it's impossible to install rear disc brake. Possibly there may be a frame deformation. Is it even ...
1 vote
2 answers
114 views

Mechanical Disk Brake Pads Too Thick

I decided to replace my front brake pads since they are worn out beyond function. So after removing the old pads, I made sure the piston was fully out, and the adjusting screw was fully tight as well, ...
17 votes
9 answers
4k views

V-brake vs hydraulic disk-brake - which is more environmentally friendly

Let me start the question by saying that I have a pretty good impression of the advantages of disk brakes vs. V-brakes, so I'm not asking about performance comparisons. I'm MTB-ing several thousand ...
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9 votes
4 answers
2k views

How do bicycle brake manufacturers balance their products' physical limitations?

This question is valid for both mechanical and hydraulic brake systems. Premises: The human hand has a threshold value for what a comfortable level of squeezing force is, which will decrease with ...
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8 votes
2 answers
401 views

What contributes to disk brake noise when wet, and how could I minimize it?

The accepted answer in Why do my disc brakes squeal when wet? states that some noise on disk brakes when wet is to be expected. However, I'm interested in factors that might affect the volume of the ...
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2 votes
3 answers
244 views

How to adjust Shimano M315 disc brakes?

I have a Cube Nature Pro (2017) bike and the brake lever for the rear brake has too much travel and braking is less effective than usual. The pads don't look too worn as there's over 1.5mm on each, so ...
3 votes
2 answers
496 views

What Shimano microspline rear wheel hub would fit my 26in Mavic Cross ride wheels?

Title. I purchased a new Deore 1x12 groupset without realising I would need to change the rear hub to fit the new microspline Shimano introduced a couple of years ago. What would the Shimano rear ...
3 votes
1 answer
333 views

What material is Shimano Brake Caliper Bolt?

Out of curiosity, would anyone know what material Shimano uses for Brake Caliper Mounting bolts? Would Stainless Steel 316 be sufficient in strength if I needed longer bolts? The particular bolt I am ...
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4 votes
1 answer
483 views

Brake pads keep getting contaminated - how to diagnose?

(see update 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 ...
  • 377
5 votes
3 answers
851 views

Cleaning Disc Brakes

I recently got a new mtb with hydraulic disc brakes and they also new to me and son I wanted to know about maintaining them, mainly cleaning, do I need to clean them? If so how often? When I wash my ...
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0 votes
0 answers
143 views

Leaking on hydraulic brake caliper piston

So, it happened after I got a pretty short ride on my bike, it is about 80km. Then I initially noticed losing braking power on my rear brake, I'm using a budget hydraulic brake (clarks clout 1) and ...
3 votes
3 answers
695 views

Wax or ceramic coat disk brake caliper?

I am currently in the process of building a new road bike and I want to preserve the nice look of my new hydraulic Shimano Ultegra brake calipers. Normally I'd just coat the the area I want to ...
5 votes
3 answers
254 views

What model of rear brake caliper do I need?

This old beater bike is missing one part. The front rotor and caliper are there. But the rear caliper is missing. What model of rear caliper do I need? If you are able to identify the model (...
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0 votes
3 answers
93 views

Mechanical disc brake caliper round pads 23 mm diameter

I’m trying to find round brake pads of ca. 23mm diameter. They are for a Valk bike brand sold online in Australia. There is no brand or model evident on the brake caliper or levers. Almost certainly ...
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8 votes
3 answers
2k views

Removing wd40 from disk brakes

I sprayed WD40 on my disk rotor and now my rotor and pads are contaminated and now my rear brakes are practically useless.Is there any way to fix the problem without swapping out the brake pads and ...
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0 votes
2 answers
143 views

Is it worth switching from V brakes to disc brakes? [duplicate]

The bike that I am getting has v brakes and I was wondering if it would be worth the money to get disc brakes for it. Can someone please help me here?
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2 votes
2 answers
143 views

Avid Jucy 3 Piston Removal (seized)

I have a set of Avid Juicy 3 calipers that I have sucessfully replaced the pistons and seals on. Getting the pistons out of one of the calipers was not so easy though, and I ended up drilling the ...
  • 11.4k
1 vote
2 answers
143 views

Are these N04C pads worn out or not?

I don't know how to tell myself so need help, please. It does look like there is still metal to be used for braking, but the brakes barely grab these and instead make a squeaking sound. I have ...
  • 497
0 votes
2 answers
286 views

Are road mechanical disc brakes safe to pair with a steel gravel bike

This is a follow up to this post: How to increase brake responsiveness on Microshift style STI brifters paired with mechanical disc brake I have mountain bike mechanical disc brakes on a steel gravel ...
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2 votes
4 answers
401 views

How to increase brake responsiveness on Microshift style STI brifters paired with mechanical disc brake

I have a set of microshift style STI brifters. They are paired to a generic brand mechanical brake set on a Kent Nazz gravel bike. I can't seem to get the brakes to be as responsive as I would like. ...
  • 155
4 votes
3 answers
1k views

Stripped brake mount on fork lower

I noticed that one of the bolts used to attach the brake to the fork is stripped and found many solutions but wanted to know if continued use will make it worse with and without repairing it. Also ...
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1 vote
0 answers
113 views

Disk brake issues

I’m new to disc brakes and noticed my braking power decreasing. Took the pads off and they look like this. Do these lines indicate anything? What is a used disc brake pad supposed to look like? What’s ...
2 votes
2 answers
157 views

Fixed piston on promax render r caliper doesn't adjust up or down

I have a bike setup with Promax Render R disc brake calipers. They use mechanical action to brake (no fluid). There's an active piston that's actuated by the brake lever, and a fixed piston that sits ...
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3 votes
1 answer
119 views

Hydro brake piston fluid volume Shimano vs. Campy vs. TRP

I am trying to mount some Hope calipers to some custom brake levers. Hope say the calipers - RX4+ - can be used safely with Shimano and Campy levers in their mineral oil form. I want to know if the ...
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0 votes
1 answer
101 views

Disc brakes rub under load

Recently I started to have issues with my gravel bike, which I bought in April 2021, a Specialized Diverge Carbon Comp. The first issue happens to be a clicking / creaking of the crankset when under ...
4 votes
1 answer
266 views

Why are disc brake calipers behind the wheel axle?

After reading this (anxiety inducing) question on a disc brake dislodging a front wheel on a brand new bike with a QR axle I wondered why the brake calipers are placed behind the axle in the first ...
17 votes
4 answers
4k 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 ...
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9 votes
3 answers
2k views

I know I am missing a rotor but I don't know what to attach it to

I got a cheap second hand bike for my son as its not worth repairing his current one as he outgrew it. At the time, I knew it needed a new inner tube which I was going to replace. Only now I noticed ...
  • 275
10 votes
3 answers
2k views

Front brake causes violent shudder

My bike is equipped with disk-brakes. It also has a fork with suspension. When I apply the front brake, my fork vibrates violently, as can be seen below: I've adjusted ...
  • 287
3 votes
3 answers
880 views

How to easily install rear disk brake wheel without service stand

I have a road bike with hydraulic disk brakes. I really struggle to install the rear wheel with the cassette and disk colliding with the frame. I spent about an hour yesterday trying to get the wheel ...
1 vote
2 answers
89 views

mechanical disc brake replacement for Schwinn Protocol 1.0

I am fixing up an older Schwinn Protocol 1.0 for a friend and I need to replace the mechanical, post mount disc brake caliper. (I took apart the old one and it is missing a magnet and in spite of ...
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