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Questions tagged [disc-brake]

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

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12
votes
3answers
4k 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 ...
1
vote
1answer
67 views

Difference between Shimano SM-RT81 and SM-RT81-A rotors?

I am working on a retro/new bike project and I have bought the Shimano SM-RT81-A 160mm discs whit Shimano SLX-M7100 brake calipers. I have seen that the brake pads on the front rotor are about 5mm ...
2
votes
1answer
94 views

Disc brake fork with QR and vertical dropouts: worrisome?

The pic below is from the fork of a 2020 Kona CoCo. Eyeballing it, it seems to me that an arc around the disc caliper contact point would pass straight through the dropout. Should this be worrisome? ...
5
votes
3answers
1k views

Is it safe to run disc brakes up front on a mountain bike that lacks a disc caliper mounting point in the rear?

Upon sharing my thoughts in an answer to a Bicycle Stack Exchange question, I wondered about my suggestion to use a disc brake up front on a frame that, lacking a disc brake caliper mounting point at ...
4
votes
2answers
81 views

Is the lateral brake disc position standardized (and, if so, to what tolerance)?

I am thinking about getting a second wheel set for my CX bike to be able to easily swap between road and off-road tires (and possibly run a tubeless setup). The bike is equipped with 12mm through-...
7
votes
5answers
2k views

Endless disc brake issues

We've purchased a new e-bike for commuting, its very heavy and carries a heavy load, and the commute is through a very hilly neighborhood. The mechanical disc brakes have become a constant issue, ...
3
votes
2answers
576 views

Shimano GRX 2x11 brake rotor compatibility

I am looking for possible disc rotors for the GRX 2x11 that comes with the GRX BR-RX810 brakes but can just find one recommendation which are the Shimano Ultegra SM-RT800 Center Lock Ice-Tech, that I ...
1
vote
2answers
83 views

Replace Shimano MT500 Caliper

I'm not finding a huge amount of information online about doing a caliper (only) replacement. My rear Shimano MT500 is having issues and I urgently need to get it working, therefore I've purchased a ...
0
votes
1answer
62 views

Shimano MT500 leaking from bleed port

My rear Shimano MT500 hydraulic disk brake has acting up for a while. After doing a full bleed and new set of pads it would be fine for about 2 weeks then start rapidly losing performance and ...
0
votes
0answers
78 views

What force (in newtons) are disc brake mounts built to handle?

I'm testing a dropout design and wondering what the standard force is considered for disc brake mounts. Simulation of mine suggests a safety factor of 15 with 2000 newtons applied to the ISO brake tab/...
1
vote
2answers
87 views

My wheel tilts to the left (to the disc side) any solution

My front tire tilts to the left when I brake hard when speeding on my bicycle. I tried almost everything to get it fixed but no luck. Can you guys tell me the reason for that? If you know how to fix ...
4
votes
3answers
270 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 ...
0
votes
2answers
115 views

How to adjust brake lever travel?

I am trying to adjust the brakes of a new bike and need some help. It has mechanical disk brakes. I have successfully aligned the disk pads so that they are parallel and are at an adequate distance ...
5
votes
2answers
3k views

Why do my bicycle brakes get worse and feel more 'squishy" over time?

My bike has disc brakes connected to the lever by cable. I've found I've been tightening the screw by the lever more and more to the point that there's not that much more room to tighten.
1
vote
2answers
105 views

Tektro Spyre C — is the rotor riveted to the hub?

I recently bought the Cube Nuroad FE. I features Tektro Spyre C mechanical disk brakes, and I am underwhelmed by their stopping performance, especially on the rear wheel. I am thinking about changing ...
-2
votes
1answer
71 views

Looking for the perfect frame [closed]

I'm looking for the perfect frame for my next build and looking for suggestions. This is going to be a commuter bike. I want disc brakes with thru-axles, a classic road-ish geometry as much as ...
1
vote
1answer
71 views

What is the ideal brake pad material for a MTB used in both downhill and cross-country/Single-track settings?

all! I and my wife both spend a lot of time doing both downhill and single-track MTB in New England. We both are still on our stock organic pads, and are looking to replace our pads soon-ish. I, ...
0
votes
1answer
107 views

Tune mechanical disk brakes TRP Spyre C

On my bike I have SRAM Rival levers paired to TRP Spyre C mechanical disc brake calipers. I'd like to tune them to "brake harder"; currently, I have to press more than half of the way on order to ...
4
votes
1answer
1k views

Disc brake equipped time trial bikes in grand tour

Why did team Deceuninck–Quick-Step ride disc brake equipped time trial bikes in a relatively flat course through Brussels in stage 2 of the 2019 Tour de France?
2
votes
2answers
258 views

Hydraulic discs on commuter bike

Does anyone have any recommendations in favor/opposed to hydraulic disc brakes on a commuter bike? I'm considering building up a new commuter with discs but, as an old-school kinda person, I have no ...
7
votes
2answers
360 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 ...
0
votes
0answers
61 views

Rear disk brake fluid leak

I tried to adjust the pads on my rear brakes but it caused some mineral oil to leak. Not sure why. I only used couple screws to allow brake pads to adjust. What could cause the leakage? What should be ...
0
votes
2answers
349 views

Removing WD40 from disk brakes - possible? [duplicate]

So I was stupid enough to get a fair bit of WD40 on my disk brakes. I tried cleaning them by removing the wheel, cleaning the disk (with soap) and to spray soap in between the brake pads and wiping it ...
1
vote
2answers
249 views

Rotor does not fit between pads after replacing the pads

I was having rubbing noises and after taking out the pads I so they were completly worn out. I have shimano r7070 calipers so according to their specs I found in a local shop the L04C as they did not ...
2
votes
1answer
282 views

Will replacing 26“ suspension fork with rigid 29”

I have an old Nashbar mountain bike with a suspension fork. I would like to replace the fork with a rigid one. The suspension fork weighs tons and is too squishy since I ride it mostly on trail paths. ...
8
votes
2answers
216 views

Is there a standard disc brake mount to disc brake rotor distance?

I'm new to disc brakes and trying to figure out what I need to buy to buy them for a wide fork (135 mm dropout spacing) with IS disc brake mounts and an electric front wheel. I've researched, but I ...
1
vote
1answer
113 views

Disc brake rub problem

There are a lot of answers for this topic already but I haven’t been able to fix it yet. When my disc brake caliper bolts are loose the rotor does not rub but when I tighten them the rotor rubs. I’ve ...
1
vote
1answer
73 views

Disc brakes not separating with force

I have Tektro disc brakes on my bike, and I guess I pulled the lever when the back wheel was off. After the pads were not separating I tried to force them apart, but got no luck. Is it because there ...
3
votes
1answer
152 views

Can I use slider dropouts on my track dropouts?

My bike's dropout/fork-end basically look like this: and I wonder if I could use something like this to convert it into a vertical dropout with a hanger and disc caliper mount: I'll only be using ...
3
votes
2answers
713 views

Giant Defy Advanced 2 brake replacement

I just bought a 2019 Giant Defy Advanced 2, with Giant's "Conduct SL Disc" brake system and it's the only thing about the bike I don't like, for many reasons. But my question is, are the rotor mount ...
2
votes
1answer
109 views

BB7 disc brake pads

I have an Avid BB7 front disc brake on a cycle that appears to have a missing inner brake pad. The outer one and the butterfly clip are in place. What might account for this? The cycle is new to me....
1
vote
1answer
247 views

Upgrade disc-brake wheels

Just bought new bike with disc brakes. If I buy an upgrade wheelset do brake discs (rotors) come with? Or do you have to buy them separately?
17
votes
4answers
2k views

Is disk brake effectiveness mitigated by tyres losing traction under strong braking?

So I understand that disk brakes are superior to rim brakes and this leads to faster stopping particularly in wet weather. I have wondered though, in wet conditions when you wish to stop as fast as ...
2
votes
2answers
740 views

Shimano 105 brifters (5800) and Avid BB5 compatibility

Are Shimano 105 brifters (5800) compatible with Avid BB5 mechanical disc brakes?
3
votes
2answers
430 views

Should I worry about uneven disc brake pad wear?

My bike was squeaking from the front wheel area when I tilted it to one side or another, but not when I rolled forward or used the brakes. I figured it was probably my disc brakes so I took them out ...
-1
votes
1answer
67 views

Mechanical disc brake not like it used to be

So basically, I removed a part from my caliper, the one with a spring in it, that is supposed to push the pad onto the rotor. I removed the cover and the spring popped out. I don't know why I did that,...
2
votes
2answers
143 views

Front disk brake squealing

I know that squealing brakes are fairly typical questions but I have not found a solution yet. My bike is a Haibike with Tektro Auriga Comp hydraulic disk brakes and in recent years I ride in ...
6
votes
2answers
4k views

Can I convert a rim brake wheel to a disc brake wheel?

I recently bought some Roval SLX 24's from eBay. I made a pretty silly error and didn't check whether they were rim or disc brakes. I need them to be disc brakes. Should they be rim brakes, will ...
2
votes
1answer
101 views

Brake weirdness on my new E-bike

I very recently purchased an E-bike for commuting to work and other area locales. I understand with any new bicycle there will be some break-in time and after a few rides I did notice the brakes were ...
0
votes
1answer
132 views

What can cause narrow disc brake gap in TRP Spyre-C?

I have mechanical disc brakes (TRP Spyre-C), second year. Last year I removed and mounted wheels without problems. This year I am all surprised because I cannot adjust the rear brake. Front -- no ...
4
votes
2answers
3k views

How can I fix brake pads being too tight even after pushing the pistons back in?

I just got delivery of a road bike with SRAM Red disc brakes. It was delivered with little inserts in the brake pads to prevent accidental squeezing of the lever when the rotor was not in. When I put ...
1
vote
2answers
333 views

Quick release and tires moving in the frame?

I have a Schwinn Boundary 2017 and it came with a quick-release front wheel. I noticed that no matter how tight I put the skewer it would be in a different position after extreme braking. The bike ...
10
votes
2answers
1k views

How to install round brake pads

I decided to change my bike's brake pads myself. My bike has the following brakes: Promax DSK-915. I contacted the online shop I ordered my new brake pads (and my bike last year), before purchasing, ...
2
votes
6answers
542 views

Loud cracking/creaking sound only when cycling uphill

I've bought a new road bike with disk brakes from Canyon (Endurace AL Disc 8.0) and have it now for a month. Since the beginning it makes a loud cracking/creaking noise. It sounds metallic, almost ...
1
vote
3answers
432 views

Hybrid flat to drop conversion advice [duplicate]

I have a Whyte Portabello hybrid, I wanted to swap to an adventure bike with drops. I thought as an alternative it might be easy to convert my existing bike instead, and save a bit of money. It has ...
3
votes
2answers
890 views

How can I know my brake fluid needs changing?

I have a few bikes with shimano disc brakes. I know changing the fluid is something that can be done and I could probably work out how to do it but I don't know what to look out for to know its time ...
1
vote
1answer
125 views

Finding compatible parts

I am looking for some guidelines for finding compatible pieces with the ones I currently have installed on my bike. I have for instance a right brake lever (bl-m445) which is leaking oil. It is ...
1
vote
1answer
85 views

Mechanical disc brake calipers: Removing pads from top side vs bottom side

Regarding mechanical disc brakes, is it preferable to have a caliper with pads removable from the top side? Shimano BR-RS305-F calipers use pads removable from the top; Shimano BR-R317 uses pads ...
5
votes
1answer
624 views

What do I do about a hydraulic disk brake piston that won't retract correctly?

My dual piston Shimano XT brakes are acting strange... One piston won't return to the right place, so one brake pad can be rubbing all the time, which doesn't let my wheel spin freely... I have done ...
5
votes
2answers
2k views

Are disc brake rotors interchangeable between brands?

I have Tektro HD-R310 brakes, with center lock rims, using the new and only center lock rotors from Tektro TR160-35 Well after 2 months of driving in winter, i already notice some rust on the rotors (...