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Questions tagged [hydraulic-disc-brake]

Hydraulic disc brakes use fluid (either mineral oil or automotive brake fluid) to transmit brake pressure from the handlebar levers to the disc brakes on the wheel.

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Hydraulic road levers bleeding not working

a long time reader here that was usually able to find an answer, but not on this one. I've done some basic and slightly more advanced fixes and part replacements on bicycles, but I've never installed ...
nomve's user avatar
  • 123
2 votes
1 answer
76 views

Braking pads developing mirror finish and squealing after cleaning?

I have cleaned the brakes because the pistons were getting a little stuck. I’ve also cleaned the (resin) pads with isopropyl alcohol and the rotors too. I then went down a hill slightly braking to ...
LargoDelgo's user avatar
3 votes
1 answer
83 views

Anyone adapted hydraulic brake levers (e.g. 105 or Ultegra) for use with rim brakes - e.g. using inline mini cylinders to drive rim brake?

We all the know the frustration of newer equipment making older stuff obsolete. My big issue is that I have some terrific rim brake wheels and bike and so I'm loathed to switch to a new bike / disc ...
Mike's user avatar
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7 votes
2 answers
764 views

How to bleed Campagnolo hydraulic disc brakes?

How to bleed Campagnolo hydraulic disc brakes, specifically the Ekar ones? I'm going to self-answer for future reference.
Erlkoenig's user avatar
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5 votes
1 answer
399 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 ...
senten's user avatar
  • 53
4 votes
3 answers
718 views

Why do we bleed at the brake lever and at the caliper in Hydraulic brakes?

I have been trying to understand about the bleeding process. While there are many videos and explanations online how to bleed, my question is simple: If the oil from the pump can travel to the caliper ...
yuvalon's user avatar
  • 523
6 votes
1 answer
395 views

How much time do we need to decide if the replacement hydraulic fluid is inappropriate for our brake system or not?

I have Magura hydraulic brakes on my bike. As it is hard to find the original fluid, I'm considering an alternative mineral oil for the replacement. I'm taking my chances to damage my system if the ...
ceremcem's user avatar
  • 163
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1 answer
68 views

Shimano st-ef-29-8 With hydraulic brakes - Can Integrated Brake Levers with Shifters be Separated?

I have an older Trek mountain bike that has front and rear disc brakes. I have newer Shimano brake calipers and levers that I want to use but on the old setup the brake lever is integrated with the ...
Paul's user avatar
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5 votes
3 answers
151 views

How long does an open jar of DOT grease last?

How long can I store an open jar of DOT hydraulic brake grease (e.g., SRAM or AVID)? Background for question: DOT fluid is hydroscopic, i.e., it absorbs moisture from surrounding air and therefore ...
Nik Kharlamov's user avatar
4 votes
3 answers
652 views

Replacing hydraulic brake lever

This is my first time dealing with hydraulic brakes. The front brake on my bike is Shimano BL-M4100 lever with MT410 caliper. I stripped the lever's clamp thread and going to replace the lever with a ...
Andrey Agibalov's user avatar
6 votes
2 answers
172 views

New Hydraulic hoses sealed

I have a new complete set of "Shimano" 105 hydraulic calipers and brake/shifters for drops. The hoses are fitted to the calipers the other end of the hoses have the barbs fitted but they ...
mt_subnet's user avatar
1 vote
2 answers
238 views

What shifters do I have to buy to fit Shimano MT200 hydraulic brakes?

i want to change my brakes from mechanical disk brake to hydraulics, as right now the braking power is absolutely abyssmal. i came across these shimano mt200 hydraulic brake set, however it seems i ...
Haadee Bin Hafees's user avatar
9 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. ...
Rеnаud's user avatar
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2 votes
1 answer
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Front disk brake digs in on bumpy roads

My front brake has a tendency to dig in or dive when I use it on bumpy roads. There seems to be a degree of positive feedback in this effect, causing me to sometimes brake much harder than I intend to ...
NotRelevant's user avatar
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3 answers
446 views

Can I use metallic or semi-metallic brake pads with a Shimano BR-MT500 brake set?

From the answers and comments to a question I recently asked about the brake on an e-bike, it seems that metallic or semi-metallic brake pads would be better than resin pads. The bike is frequently ...
JRE's user avatar
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8 votes
4 answers
2k views

What happened to the hydraulic disc brakes on my new bike?

I bought a new Ortler electric bicycle a couple of months ago. My wife used it for a couple of weeks to ride to work each day. The brakes squealed from almost the first day. After a couple of weeks, ...
JRE's user avatar
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2 votes
2 answers
224 views

Shimano BR-MT400 caliper upgrade?

After 2 years calipers no longer retract fully (pistons) causing annoying rubbing sound. What options do I have to upgrade it (perhaps something more durable) providing I still want to reuse the same ...
Pekotski Bit's user avatar
0 votes
1 answer
293 views

Tektro HD-M275 rear brake making grinding noises while braking

I got Tektro HD-M275 hydraulic disc brakes with 180mm rotors, front brake is working perfectly with no issues. Under light braking rear brake works normally without any noises or vibrations, but as ...
57_Pixels's user avatar
4 votes
1 answer
391 views

Brake piston fell out during bleeding - anything to fix?

When bleeding a brake, I did not insert the correct spacer, pushed the lever too eagerly, and the piston fell out (and the oil was on the floor). Is there anything to fix after this besides just ...
Konstantin Shemyak's user avatar
1 vote
0 answers
157 views

Specialized bike - Can you help identify? [closed]

[![660 4th St, #107, San Francisco, CA 94107, USSays "Crosstrail" on it with a serial number starting with "wsbc." Also, can you give me estimated resell value?
Kyla's user avatar
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6 votes
3 answers
435 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 ...
Art Gertner's user avatar
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1 vote
1 answer
82 views

Does the front hydraulic brake hose also requires foam to avoid noise?

I watched a few videos of hydraulic brakes installation and notice that people install a foam pipe over the hose for the rear brakes. My hydraulic brake set has only one foam. Should I install the ...
Bob's user avatar
  • 292
3 votes
1 answer
331 views

how does rotor heat dissipation correspond to wheel size?

My brompton has disc brakes. I believe effective wheel diameter is 419mm (349 rim + 35mm tyre), compared to 698mm for 700c + 38mm tyre. I have 160mm rotors, which for stopping power would seem to ...
jhnc's user avatar
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3 votes
6 answers
945 views

When does the braking power stop scaling with Rotor Size

It's commonly established that the braking power scales with rotor size, and an optimal braking technique is to provide enough force for the rear wheel just to lift up. However, my question is wouldn'...
isotope's user avatar
  • 33
1 vote
1 answer
108 views

Hydraulic disc brake not retracting when braking softly

I bought a new bike last week that has Tektro HD-R280 hydraulic disc brakes. I noticed on my first test ride that the front brake was rubbing against the rotor, but only when turning left. Since I ...
bikemonger's user avatar
3 votes
1 answer
109 views

Maintenance of metallic hydraulic disc brake pistons?

I have Tektro Auriga HD-M290 hydraulic disc brakes and they have metal piston. One of the pistons sticks out more than the other and they don't come out much even though I squeeze the brake lever many ...
Ender's user avatar
  • 2,032
4 votes
1 answer
898 views

Can I avoid rubbing by enlarging the gap between the brake pads on hydraulic disc brakes?

My front brake rotor is rubbing against the pads as the gap is very narrow between the pads and the wheel is not completely true. Is it possible to remove the brake pads and enlarge the gap a little ...
Ender's user avatar
  • 2,032
5 votes
2 answers
285 views

Tektro hydraulic disc brakes chatter under load

I bought a second-hand bike in good condition, however the hydraulic brakes chatter under braking load. Check it out: https://youtube.com/shorts/hdDmeGFhjgk?feature=share It's a Kona Splice with ...
Chris Wilks's user avatar
1 vote
2 answers
381 views

What to considering when replacing disc brake calipers?

I currently have an endurance road bike equipped with Shimano 105 hydraulic disc brake calipers. Since I am transforming it into a gravel bike, I would like to change the calipers to the Shimano GRX ...
Bob's user avatar
  • 292
6 votes
2 answers
119 views

Hydraulic disc brake maintenance in the absence of performance issues

I see lots of questions about hydraulic brake-specific maintenance. I.e. related to the hydraulic system itself, not the pad/rotor interface. (For this question let's ignore the latter since that's ...
SSilk's user avatar
  • 4,199
0 votes
2 answers
408 views

Mountain bike brake pistons not compressing when brake is pulled

I have a Shimano BR-MT201 Hydraulic Disc Brake on my rear brake. I was replacing the brake pads and accidentally pressed the brake too many times and the piston popped out leaking brake fluid. ...
TopherInLoafers's user avatar
3 votes
2 answers
2k views

Why is my brake lever loose on my hydraulic disc brake i took my wheel off and pressed the brake now the brake lever is loose and touches the grips

What i did in order : cleaned the brake pads -put them back in pressed the brake lever pushed the brake pads inwards put the front wheel on Now as a result of this the brake lever is loose
Harry Dolan's user avatar
0 votes
1 answer
523 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 ...
Nik Kharlamov's user avatar
3 votes
1 answer
208 views

Hydraulic sub brake lever as primary lever

I can see answers for this question with cables but cannot find an answer for hydraulic brakes. I am looking for a 31.8mm clamp hydraulic disc brake lever for my fixed gear commuter, and have seen the ...
Richard Birch's user avatar
2 votes
0 answers
311 views

SRAM Guide R bleed problem

I'm bleeding my SRAM Guide R brakes. When working on the rear brake I noticed that the fluid can go from the lever syringe into the caliper syringe, but not the other way around. I can't move the ...
Jose Angel Garcia Frediani's user avatar
1 vote
0 answers
337 views

Cross (also called in-line or sub) brake levers compatible with SRAM Apex

Does somebody know of cross/in-line/sub brake levers compatible with SRAM Apex? Could the Shimano GRX sub brake levers perhaps work? See https://bike.shimano.com/en-EU/product/component/grx-11-speed/...
Christian Vincenot's user avatar
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 ...
Brian B's user avatar
  • 21
4 votes
1 answer
387 views

What's the significance of "Inside" vs "Outside" caliper hose connection?

When Shimano rolled over from the "x000" series mtb brakes (e.g. 6000, 7000, 8000) to the x100 series, one thing that changed is where the hose connects to the caliper. Before, it was on the ...
Fragrant_Mechanic's user avatar
1 vote
1 answer
123 views

Rear brake is rubbing but the caliper is as far over as it can be

The hydraulic disc brake on the rear of my bike is rubbing quite badly, even after trying to realign the caliper. The caliper is as far over on the mounts as it can be and the rubbing still persists. ...
Oliver's user avatar
  • 11
4 votes
1 answer
2k views

Shimano J-Kit installation

I'll soon be installing the BR-MT410 and BL-M4100 using the "easy hose joint system" (I assume) J-kit. The instructions look straight forward but i still have some questions. The caliper ...
Turan's user avatar
  • 61
0 votes
1 answer
559 views

Why is there no pressure in brakes after leak?

I made a mistake when trying to align the caliper to correct for the disc rubbing against the brake pads. Instead of unscrewing the bolts mounting the caliper body to allow adjustment, I unscrewed the ...
lost_M's user avatar
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1 vote
1 answer
486 views

Scratched hydraulic brake hose during install - should I be concerned?

today I was installing brand new GRX brakes into new frame. It was not my first time, I've already build 10+ bikes, I messed up through. I inserted rear brake hose without any issues, I had my guide, ...
sramandavid's user avatar
8 votes
2 answers
671 views

Is degassing DOT brake fluid before a bleed still a thing?

I recently bled old AVID Juicy 3 hydraulic brakes and followed the procedure described in this AVID Bleed Procedure video (starts at the relevant section). While preparing the syringes, the technician ...
olliebulle's user avatar
  • 4,119
-1 votes
1 answer
94 views

Mechanical bike disc brake caliper lever

Where can I find a data sheet for this part? I want to know if there is a magnification factor between the force which acts on the disc brake by pads, and the force that I pull the wire with, as I ...
المهندس محمد جابر's user avatar
2 votes
1 answer
634 views

How do I replace one oil with another in a Shimano brake system?

Having seen this question about correcting the "wandering bite point" problem common with Shimano brake systems, I intend to replace the standard Shimano mineral oil in my brakes with the ...
Will Vousden's user avatar
  • 3,981
2 votes
3 answers
383 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 ...
MaxD's user avatar
  • 854
9 votes
7 answers
1k views

On road repair for hydraulic brakes

What are the possible on-road modes of failure for hydraulic bicycle braking systems, and what can a touring cyclist do to be prepared for their eventuality? What can one carry as an emergency backup ...
SamA's user avatar
  • 2,696
4 votes
2 answers
379 views

Can i adjust Avid Elixir R SL hose angle without bleeding?

I would like to adjust the angle of the brake hose coming from the caliper. I think this can be done by moving this part which should is called banjo i think. I would imagine I would need to loosen ...
KarelPrdel's user avatar
2 votes
1 answer
123 views

Oil stopper of Shimano oil funnel: what's its sharp end for?

Shimano instructs to insert the sharp end of the "oil stopper" to bleed the brakes: What is this for? I would expect that the oil should just flow from/to the funnel when pumped into the ...
Konstantin Shemyak's user avatar
9 votes
1 answer
494 views

Bleed or flush old oil before brake removal and storage?

I'm about to replace my stock Shimano BR-MT400 hydraulic disc brakes. The cables are external. I think I have a sense of how to install, bleed and bed-in the new Maguras, but is there some best ...
parisminton's user avatar

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