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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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1 answer
31 views

Shimano Hydraulic Disc Brake Recommendation For Trek Verve 3

I recently purchased a Trek Verve 3 and like many who bought it, the bike came with the substituted Power hydraulic brakes. I don't recall who makes these brakes, but I did find them online. ...
2 votes
4 answers
480 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 ...
6 votes
2 answers
7k 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 to ...
0 votes
0 answers
19 views

SRAM Rival Hydraulic Brake - Bleeding issues

After 5000km of perfect performance my rear brake started to fade so I decided to bleed it. I have bled many hydraulic systems before (mostly MTB) with no issues. However the SRAM Rival setup has been ...
0 votes
1 answer
339 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 ...
4 votes
1 answer
122 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 ...
3 votes
1 answer
200 views

Hydraulic brakes worked just fine until I switched them to another bike

Hydraulic brakes worked just fine until I switched them to another bike. Now every time I squeeze them they seem to stay compressed but my lever releases. Hydraulic brakes when squeezed stay ...
3 votes
0 answers
40 views

Disc Brakes Squeal repeatedly [duplicate]

I have a little mechanical aptitude, so when my rear brakes began to squeal I took them to a bike shop. They changed the pads - bike is under 6 months old and cleaned the rotors. I broke them in and ...
8 votes
1 answer
593 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 ...
0 votes
0 answers
41 views

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 ...
9 votes
1 answer
923 views

Shimano Dura-Ace R9120 lever leaking

My bike's Dura-Ace R9120 rear-brake/front derailleur shifter (left shifter in UK) leaks brake fluid when I pull hard on the lever. It leaks from this specific place: I understand this lever is ...
3 votes
1 answer
89 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 ...
4 votes
3 answers
3k views

Sticky/Not fully returning ultegra r8070 brake lever

Got this used di2 equipped bike with what seemed to be just a spongy front brake. Bleeding as per manual. Still "mushy". Emptied the line and disconnected the hose. The lever just don't ...
0 votes
3 answers
543 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 ...
2 votes
2 answers
2k views

Will an MTB hydraulic brake lever be compatible with road hydraulic brake caliper?

I'm looking for a brake caliper that will be compatible with an XTR brake lever. As I browse through Shimano's line of lightest brake caliper, I found that Dura-Ace is the lightest but it's a road ...
7 votes
3 answers
9k views

Hydraulic brake lever doesn't return after being released, dependent on weather

I have a pair of second-hand Shimano ST-RS685 hydraulic brake levers / shifters. Unbeknownst to me they hadn't been used for a year and had quite a bit of dirt / grit inside, which I've cleaned to a ...
7 votes
2 answers
895 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.
5 votes
1 answer
410 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 ...
4 votes
3 answers
726 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 ...
6 votes
1 answer
399 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 ...
0 votes
1 answer
78 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 ...
2 votes
6 answers
25k views

Alternatives for mineral brake fluid / oil (in a pinch)

In case you don't have 'original' bicycle specific brake fluid on hand (e.g. "Magura Royal Blood"), what might be a good alternative to use (in a pinch) in hydraulic (disc) brakes? (for brakes that ...
4 votes
3 answers
757 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 ...
5 votes
3 answers
153 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 ...
6 votes
2 answers
186 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 ...
7 votes
3 answers
30k views

How do I cut hydraulic brake hose without expensive tools?

I've seen some expensive hydraulic hose cutting tools for over $100, e.g., the "SRAM PitStop Hydraulic Hose Cutter Tool". I just want to cut the two new brake hoses I have now, so I don't ...
1 vote
2 answers
293 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 ...
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. ...
2 votes
1 answer
125 views

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 ...
4 votes
1 answer
2k views

Hydraulic mtb-style brake lever on drop handlebars

tl;dr Does anyone know of an existing hydraulic brake lever (eg (like this)) that can clamp on a 31.8mm bar or can anyone think of a way I can hack/bodge/modify one? I'm thinking similar to how CX ...
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, ...
0 votes
1 answer
805 views

Can I use a Shimano BL-MT200 lever on a Shimano BR-M446 brake caliper?

I have a leakage on my lever, and can't find any Shimano BR-M446s for sale. Was wondering if Shimano BL-MT200s were compatible.
5 votes
1 answer
3k views

Brake pads keep getting contaminated - how to diagnose?

(see updates 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 ...
7 votes
2 answers
14k 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 ...
2 votes
2 answers
253 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 ...
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 ...
4 votes
1 answer
459 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 ...
6 votes
3 answers
490 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 ...
1 vote
0 answers
190 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?
1 vote
1 answer
89 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 ...
3 votes
1 answer
333 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 ...
3 votes
6 answers
959 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'...
13 votes
5 answers
9k views

What causes and how to fix wandering bite point on Shimano hydraulic brakes?

For the last two months and less than 600 km of riding I have been using a pair of new Shimano SLX BR-M7120 "high power" 4-piston hydraulic disc brakes. Yesterday I have noticed that the bite point of ...
1 vote
1 answer
118 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 ...
8 votes
6 answers
10k views

What and where is the weeping port on Shimano MTB brake levers?

I understand that when you overfill some models of Shimano hydraulic brakes with oil, the excess will flow out of a one-way valve called weeping port, but cannot find any technical documents, pictures ...
1 vote
2 answers
4k views

Avid Juicy 3 brake piston problems

I have an 8-year-old old Avid Juicy 3 and I accidentally pressed the front brake lever while the wheel was removed. I used a flat-head screwdriver to reset the pistons. When I spin the wheel after ...
5 votes
2 answers
395 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 ...
3 votes
1 answer
110 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 ...
4 votes
1 answer
1k 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 ...
0 votes
2 answers
469 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. ...

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