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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6
votes
4answers
259 views

I am putting drop bars on one of my MTB Shimano 10 speed 1x Deore. I am looking for a road hydro shift lever

I will be putting road drop bars on one of my mtb's for this coming winter as a project that has Shimano 10 speed 1x Deore. My goal is to "simply"🙈😆 have road shift levers and hydraulic ...
4
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2answers
377 views

Shimano Deore hydraulic brake problem

I have a bike (Cannondale Quick MX) I used frequently until last fall, when I got a driving license (not my first, well out of my teens) and a car to use. The bike is 3 1/2 years old now. Since the ...
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0answers
36 views

new Clarks m2 hydraulic disc brakes won't retract when brake lever pressed

I just fitted a new set of Clarks M2 hydraulic disc brakes. I aligned the calliper to make sure the rotor doesn't rub the pads when the wheel is spinning. I then pressed the brake lever, when letting ...
3
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1answer
85 views

Replacing a SRAM Force hydraulic caliper with a new one

I'm replacing my SRAM Force hydraulic caliper with a new one, I've drained the old one so there's no fluid in it. When replacing the caliper with a new one how can I put fluid into it? Should I just ...
0
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0answers
44 views

Brake problems (hope tech hydraulic)

My brake pads are stuck so I brute force them apart and when I finally put them back on and go to pull the lever it is extremely loose. When I let go it makes the pads completely close up and cause ...
4
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2answers
977 views

Can broken caliper be fixed?

I have a broken hydraulic caliper and am wondering if it can be fixed? Can I buy the half that the broken mount is on or would it be better just to buy a new one?
4
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2answers
124 views

Which bolt to use when aligning disc brakes?

I am struggling with a rubbing disc rotor on a new bicycle. Which bolts should I use when trying to align the caliper? The ones I marked in red, or the blue ones? I tried to use the red ones so far, ...
5
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1answer
157 views

Should I replace my disk brake calipers?

I have a pair of Shimano Deore BR-M615s on my mountain bike with about 3,000 miles and 5 years on them. Lately I've noticed that both brakes have too long of "pull" before providing braking. ...
0
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1answer
57 views

My front rotor seems to be making a grinding noise, I have a relatively new bike and I’m not sure what’s causing it

I’m new to cycling and I have a road bike with hydraulic disc brakes. I noticed that they are making a quiet, but audible grinding noise. I’ve heard this noise before and since I have a new bike, ...
7
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0answers
136 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 ...
0
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2answers
79 views

Hydraulic disc brake clicks once when I pull the brake lever and the braking force is very bad

I have a brand new Trek Marlin 5 (1-2 months old) with hydraulic disc brakes and the rear brake doesn’t work well and when I pull the brake lever, it clicks once somewhere in the frame (cables inner ...
3
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0answers
53 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 ...
3
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1answer
402 views

Reach Adjust on Shimano hydraulic brake levers for MTB flat bar

I am thinking to install Shimano BL-MT200 (or the BL-M315 depending on availability) on my son's bike (my son is 7 years old). The bike currently has short reach brake levers for the current ...
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0answers
42 views

Avid brake lever plays, do I need to bleed?

The particular bike has Avid Juicy 3.5 brake system and it was unused for a long period (years). So I decided to bring it to my wife's place. I removed the front wheel and put it in the trunk. When I ...
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0answers
48 views

Hydraulic disc brake - lever slowly touches bar

I have a magura disc brake. When I pull the lever and keep applying constant pressure to it, it slowly retracts all the way to touch the bar. This process takes about 10 / 15 seconds. I have tried to ...
1
vote
3answers
774 views

Front disc brake rattling noise

I recently purchased a brand new Scott Genius 950 at a local bike store. After bedding in the brakes, I noticed a rattling noise while riding coming from the front disc brake. I brought it back to ...
0
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1answer
83 views

How to adjust brake level movement on hydraulic brake?

My bicycle has Tektro Auriga hydraulic disc brakes. I can adjust how far the level stitches out with a small screw (see here, figure c2). I was wondering if it is possible to adjust how much the ...
2
votes
2answers
256 views

Hydro disk brakes only work when pumped

I live in a very wasteful student neighborhood, and just found a lightly-used Kona Lisa DS (ca 2007ish) with Hayes Sole hydraulic disc brakes in the garbage. After a thorough dusting, it's in great ...
3
votes
1answer
252 views

New Shimano 105 hydraulic brake loses pressure

I have a brand new bike with about only 25 miles on it. On a ride today the rear brake (Shimano 105 hydraulic) became spongy, letting me max out the lever but giving on about 25% of braking power. I ...
2
votes
1answer
43 views

Back wheel rubs against the back brake pad when riding

My aging 26" Nishiki 10 speed is still a great bike and ride and well maintained. 25yr warranty ended in 2009. I am 6'7" and 280lbs now and was 250lbs when I purchased it. For some strange reason now ...
0
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0answers
65 views

Trouble aligning front disc brake - rotor noise

I'm having trouble getting my front brakes aligned properly and staying aligned. The brakes are Tektro HDR-210 - I asked Tektro and they should be an OEM version of the HDR-310. I've just installed ...
2
votes
2answers
450 views

Hydraulic disc brake - lever compatibility

I purchased a gravel bike with drop handlebars, mostly for commuting and maybe for some weekend bike camping trips. I've only ever ridden mountain bikes with flat bars in the past, but I figured I'd ...
2
votes
1answer
79 views

Brake pads don’t fit into the calipers [duplicate]

This is my first time replacing the brake pads of hydraulic brakes. I removed the old ones and the model was Shimano B01S Resin, so I bought the same ones. However, when I have replaced them. They ...
0
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0answers
62 views

Disc brake makes scratch noise when wet

I bought a TREK FX SPORT 5 a couple of weeks ago and I've ridden it like 200km without any problems. Today was the first time I biked when it was raining and I noticed after like 100 meter that there ...
2
votes
1answer
50 views

Brand new BR-R7070 brakes, piston issue [closed]

The ceramic pistons on my brand new BR7070 brakes won't depress at all even with quite a lot of force. There is also a subtle grinding noise when trying to depress the pistons. Did I somehow crack the ...
0
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0answers
40 views

I require advice on a recurring problem with my brakes

I've had a bike with hydraulic brakes for about six months now, and have a problem with the brake just losing power. I think it's fluid being lost. This is a question I asked earlier Something wrong ...
3
votes
1answer
56 views

Shimano Alfine lever does not seem to pump oil into the hose even with reservoir full

I am trying to refill a Shimano Alfine BR-S500 disk brake system with oil. I have filled the reservoir with mineral oil... And am repeatedly squeezing the lever, but it feels like no oil is getting ...
0
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1answer
653 views

SRAM Guide R brakes pad adjustment

I've replaced my old brake pads in SRAM Guide R brake set, and I've noticed that the old pads were sitting much closer to the rotor than the new ones (I've also definitely used all of the old pads). ...
2
votes
1answer
48 views

Should my new 203mm adapter go over the existing one? Do they stack?

This is my fork: and this is the adapter I got (SM-MA-F203P/PM): (click to enlarge images) The adapter is missing screw holes on the sides to fit on the fork. The bolts it came with are long ...
1
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1answer
188 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 ...
1
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1answer
109 views

Creaky hydraulic disc brakes on MTB

I am having some trouble with my Boardman Mht 8.8. Whenever I press my brakes while stationary, and move the bike with them engaged, a creak and clunk sounding noise appears, every time. This ...
1
vote
1answer
50 views

Unable to push oil in when bleeding Shimano brakes

I am trying to bleed my Shimano BR-M355 rear brake. This is my first time so it is possible I am making a very obvious mistake. The issue I am facing is that I am unable to push oil in through the ...
2
votes
2answers
344 views

Disc brake rotor scraping against mounting bracket

(My question is related to Rear disc brake rotor rubbing against caliper frame mount? but I hope to provide some more context & photos.) I have a Rocky Mountain Edge mountain bike (possibly 2011 ...
1
vote
1answer
86 views

How to adjust hydraulic disk brake lever reach during bleeding?

During a crash I have bent my adjustment knob on Sram Code brakes and now after bleeding the lever is a bit too far away for my liking. The knob is bent and can't be turned. If I'll reduce the ...
1
vote
3answers
1k views

Changing SRAM Rival brifters to flat bar - which hydraulic brake levers?

I've got a gravel bike, the Planet X London Road, with SRAM Rival 1x11 groupset. I'm thinking of converting it to a flat bar. From what I have read, any SRAM 11 speed shifter should work, as the ...
2
votes
1answer
151 views

Where is the grease on my front brake caliper coming from?

I've had a new road bike for three months to commute. I live on the east side of Hawai'i island so I'm often riding in the rain. A few weeks after I first bought the bike the front brakes started ...
1
vote
1answer
99 views

Shimano hydraulic hose - BH90-SB compatible with BH90-J/JK

My problem, I have a complete M7000 (MTB) brake set that uses SM-BH90-SB hose, and now I want to connect a 105er BR-R7070 brake caliper that needs SM-BH90-JK-SSR or SM-BH90-J-SSR hose. Are the two ...
2
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0answers
2k views

Hydraulic Brake Hose Size Standards

I am looking to buy some (approx 30 meter) hydraulic brake hose for general use (fixing brakes) and would like to know what size (inner diameter/outer diameter) would be most suitable for the bigger ...
1
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1answer
731 views

I would like to upgrade my Shimano disc rotors from 160mm to 203mm. How to pick the right rotors?

My bicycle came with the BR-MT200 (https://www.bike-discount.de/en/buy/shimano-br-mt200-disc-brake-set-721603) brake set: hydraulic levers, 160mm rotors. I'd like to upgrade to 203mm, but I don't ...
1
vote
1answer
225 views

TRP Hy Rd brake : why won’t actuator arm return properly?

The actuator arm on my TRP Hy / Rd front brake no longer returns to the correct position. Even with no cable attached, it requires a bit of help to return to its resting position. The result is that ...
4
votes
1answer
1k 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 ...
0
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2answers
4k 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 ...
-1
votes
2answers
1k views

Upgrade 160mm to 200mm disc brake rotor

I want to upgrade my mtb's front brake to a 200 or 203mm brake rotor. current setup (180mm): My front fork's posts are for a 160mm rotor (without any adapters/brackets, with the brake caliper bolted ...
8
votes
3answers
373 views

Bleed port repair on Shimano road shifter?

I noticed that a small amount of mineral oil had leaked from the bleed port on my Shimano road shifter. I inspected the bleed port screw and saw that it was loose. The threads on the lever appeared to ...
0
votes
1answer
183 views

Hydraulic Disc Brake (how to choose correct model)

I recently broke off the lever of my front brake and am looking for a replacement lever or front brake. Need some input/suggestions from more experiences riders. Some of my questions: What are the (...
1
vote
0answers
73 views

Differences and effects of brake lever offset

I've seen some flat bar brake levers where the the pivoting plane of the lever blade is offset and not in line with the center of the handlebar's cross section. What's the purpose for such design? ...
2
votes
1answer
90 views

Clamp width of new Shimano brake levers

Can anyone measure the width of the clamp (the dimension parallel to the bar) of the new XT M8100 12 speed Shimano brake levers? I want to know the amount of 'bar space' the clamp takes up. The ...
1
vote
1answer
297 views

Disc brake just a little too tight

I have pushed the hydraulic pistons fully out, but after a single firm squeeze of the brake lever, they ride slightly too tightly, such that rear wheel doesn't spin freely. It rubs a little bit. How ...
1
vote
1answer
99 views

Is master cylinder hydraulic fluid level critical (Shimano)?

I managed to successfully bleed a Shimano hydraulic brake but used an improvised kit instead of the official Shimano one. Since I used a regular syringe instead of the funnel+plunger system which may ...
0
votes
1answer
160 views

My front disc brakes are rubbing despite my efforts

I tried everything Reset pistons Reseat caliper position Credit card method Brakes become very tight after a few squeezes Update: I went to the bike shop twice, they reset the brakes twice, ...

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