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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2answers
62 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 ...
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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 ...
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1answer
149 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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40 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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41 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 ...
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3answers
166 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 ...
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1answer
53 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 ...
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2answers
232 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 ...
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1answer
239 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 ...
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1answer
41 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 ...
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61 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 ...
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2answers
154 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 ...
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1answer
67 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 ...
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55 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 ...
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1answer
48 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 ...
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39 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 ...
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1answer
50 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 ...
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1answer
359 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). ...
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1answer
44 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 ...
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1answer
134 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 ...
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1answer
87 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 ...
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1answer
37 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 ...
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2answers
167 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 ...
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1answer
68 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 ...
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3answers
695 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 ...
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1answer
116 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 ...
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1answer
83 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 ...
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0answers
1k 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 ...
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1answer
418 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 ...
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1answer
155 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 ...
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1answer
629 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 ...
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2answers
2k 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 ...
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2answers
668 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 ...
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1answer
218 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 ...
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1answer
170 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 (...
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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? ...
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1answer
83 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 ...
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1answer
207 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 ...
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1answer
94 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 ...
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1answer
123 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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1answer
179 views

Hydro brake disk blackening

I have had my bike for about 2 months now and about 2 weeks in the rear brake stopped working properly and I thought it just needed a bleed. The shop assistant showed me that my disk had oil on it ...
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3answers
187 views

What factors to take into account when choosing a hybrid bike?

I've decided I'd like to start commuting to work, but I'm not sure what factors I need to take into account when choosing a bike. I figured a hybrid bike suits my needs best, since I will be riding on ...
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2answers
999 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 ...
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1answer
154 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.
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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 ...
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3answers
370 views

Combining Deore XT 9-speed shifters with Deore XT BR-M8000 (I-Spec-II)

I wanted to convert my trekking bike to a mountain bike, and replace the Deore XT V-Brakes with disc brakes. However, the bike still has a perfectly functional Deore XT groupset (9-speed; unsure about ...
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2answers
126 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 ...
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1answer
262 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 ...
2
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1answer
411 views

Best type of brake pads during winter conditions for disc brake bikes

I'm going to be riding my bike daily during the rainy Belgian winter (-2°C to +5°C). If it snows or freezes the roads will be covered with salt. I'm using the 105 R7000 series hydraulic disc brakes. ...
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1answer
178 views

Leak in my disc brakes

I had a small crash and the other day I checked my bike for damage. I found that there is very small leak on my brake hose where it meets the lever. I tried pushing the lever but nothing came out so ...

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