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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Brake or Wheel Click under braking

I have a clicking from my rear wheel (sometimes in the front too), when applying my brakes. Sounds similar to a aluminum can tab being snapped, or can being flexed. Product Brand Model Caliper ...
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1 answer
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After bleeding Tektro Draco one of the screws on the reservoir tank is leaking

I recently bled my Tektro Draco 2 because it had become too spongy. Unfortunately, out of stupidity, I first opened one of the screws on the reservoir cap instead of the vent screw. It has been ...
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3 votes
2 answers
170 views

Why aren't mechanical disk brakes self-adjusting?

Hydraulic disk brakes usually adjust for pad wear via special seals that allow the pad to "creep" closer to the brake disk as they wear down. It seems that such seals could equally well be ...
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2 votes
0 answers
52 views

after multiple brake bleed, lever's max stiffness is still close to bar

so after a few bleeds i've done on these Shimano saints, because of new levers replacement, i've found that the rear brake lever, although on max stiffness, goes way further to the bar then the other ...
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1 vote
0 answers
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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 ...
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7 votes
1 answer
192 views

Why do hydraulic brake/shifter lines cross in front of the handlebars?

On all of the bikes I've ridden, the brake hoses and shifting cables make an X-shape in front of the head tube. That makes sense if: Front brake lever is on the right side (hose goes from non-drive-...
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  • 509
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0 answers
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Can non-brake silicone lube be a good substitute for hydraulic seal lubricants in brakes?

Hope suggest using Hunter silicone lubricant (SC960) when assembling pistons, etc, on their (DOT 5.1) hydraulic brakes. It is supposed to be easily available but it took me a while to find some at a ...
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1 answer
97 views

Shimano BR-RS805 hydraulic disc caliper alternatives?

I have a bike from early 2016 with Shimano BR-RS805 hydraulic disc calipers. These need to be replaced, but are discontinued, and newer road/cross/gravel offerings from Shimano use BH90 hoses, while ...
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17 votes
9 answers
4k views

V-brake vs hydraulic disk-brake - which is more environmentally friendly

Let me start the question by saying that I have a pretty good impression of the advantages of disk brakes vs. V-brakes, so I'm not asking about performance comparisons. I'm MTB-ing several thousand ...
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12 votes
3 answers
487 views

Why would hydraulic calipers (not rotors) only be compatible with resin pads?

These calipers aren't supplied with rotors, so the answer to the very similarly titled What features make a disc brake caliper unsuitable for use with other than resin pads can't possibly apply. ...
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2 votes
1 answer
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where can I find a right side dropbar hydraulic brake only lever? I'm using bar end shifters

I am using a 10 speed bar end shifter on drop bar. I have hydraulic brakes and can not find any non shift right side brake levers. Only left side. Any suggestions on how I can rework a left side ...
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0 answers
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Steel frame sets compatible with disc brakes [closed]

I have acquired a shimano deore groupset from a Kona Dew FS. The alu frame snapped due to poor storage whilst in transit. I’d like to fit the components to a new frame set but am interested to hear if ...
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3 votes
1 answer
94 views

Problem bleeding Shimano XT brakes

I have a problem bleeding Shimano XT brakes: The oil can come down if I open the system at the bottom, and the oil drips down. But once I connect the syringe, put the little plastic cup screws on the ...
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2 votes
3 answers
154 views

How to adjust Shimano M315 disc brakes?

I have a Cube Nature Pro (2017) bike and the brake lever for the rear brake has too much travel and braking is less effective than usual. The pads don't look too worn as there's over 1.5mm on each, so ...
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3 answers
214 views

How could hydraulic disc brakes make sense on MTBs and gravel bikes?

This How To Clean Hydraulic Brake Pistons video (Park Tool's Tech Tuesday #104) shows how dust particles can interfere with the proper functioning of hydraulic pistons. Disc brakes have been adopted ...
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4 votes
1 answer
299 views

Brake pads keep getting contaminated - how to diagnose?

(see update 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 ...
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0 answers
86 views

Leaking on hydraulic brake caliper piston

So, it happened after I got a pretty short ride on my bike, it is about 80km. Then I initially noticed losing braking power on my rear brake, I'm using a budget hydraulic brake (clarks clout 1) and ...
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12 votes
1 answer
1k views

How do I rebuild Shimano XTR brake levers?

My right brake lever (Shimano BL-M9020 to be specific) has attracted some dirt around the blade pivot area, and some parts look shiny. I suspect the master piston seals are starting to leak. Replacing ...
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3 votes
3 answers
225 views

How hard is it to get hydraulic disc brakes “tuned” well?

A few days ago my rear (disc, hydraulic) brake started feeling a bit funny, then “went” completely. I took it to the shop where it’d just been serviced a week earlier and they said I must’ve got a ...
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1 vote
1 answer
227 views

Shimano Hydraulic Disc Brake Leaking Oil

I have a Shimano 105 BR-R7070 hydraulic disc brake and just discovered that the front caliper is leaking oil from one side of the pistons. I'm wondering if this is fixable? If not, what replacement ...
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3 votes
3 answers
662 views

Wax or ceramic coat disk brake caliper?

I am currently in the process of building a new road bike and I want to preserve the nice look of my new hydraulic Shimano Ultegra brake calipers. Normally I'd just coat the the area I want to ...
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1 vote
1 answer
222 views

My Shimano brake caliper is leaking

A couple of weeks ago, I tried to bleed for the first time my Shimano disc brake. I won't say it was easy and I'm not sure I did it perfectly but the fact it brakes better now. However, I've noticed ...
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2 votes
2 answers
96 views

Avid Jucy 3 Piston Removal (seized)

I have a set of Avid Juicy 3 calipers that I have sucessfully replaced the pistons and seals on. Getting the pistons out of one of the calipers was not so easy though, and I ended up drilling the ...
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2 votes
2 answers
104 views

failed brake bleed, lever is blocked up

My brakes are Shimano Saint. I tried bleeding my brake to identify a problem and no fluid went through. I took the brake lever off separately and pushed water through it, still blocked so I gathered ...
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1 vote
2 answers
104 views

Bleeding brake lever impossible (sucks air)

I did the bleeding procedure for my Avid Elixir CR (hydraulic disc brakes), following the Avid service manual. While performing the last step, bleeding the lever, it seems that air was sucked in from ...
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1 vote
1 answer
239 views

Brake lever suddenly lost its extra movement (extremely stiff). before the pads contact the Disk

a month back i had a crash where the brake lever got a clump of sand on it, so i washed it out with water and didn't have any problems, then one random day when i took my bike out for a ride i noticed ...
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11 votes
1 answer
485 views

Ultegra ST-R8020 Lever: crack near brake hose interface

I have a bike with a left ST-R8020 hydraulic disc Ultegra lever, and I just noticed a large radial crack on a what seems to be part of the brake connection path (see picture). The crack seems to ...
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3 votes
1 answer
84 views

Do I need to keep hydraulic master cylinder right way up?

I want to swap the handlebars for a different pair. I have hydraulic brakes. When i remove the master cylinders from the old handlebars is it necessary to keep them upright, or keep them above the ...
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3 votes
1 answer
97 views

Hydro brake piston fluid volume Shimano vs. Campy vs. TRP

I am trying to mount some Hope calipers to some custom brake levers. Hope say the calipers - RX4+ - can be used safely with Shimano and Campy levers in their mineral oil form. I want to know if the ...
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1 vote
1 answer
71 views

Brake (Formula T1S) extremely sticky for no reason

The video shows Formula T1S rear brake was last maintained/bled 6 months ago, on a 2015 mountain bike which I rode last 1 month ago: the brake functioned normally then (OK, it had a very slight rub). ...
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0 votes
2 answers
215 views

Disc Brakes Explained

I have recently have purchased my first ever bike with disc brakes, I wanted to know the basics, the dos and don'ts, and to understand stuff I hear like contaminating disc brakes, what does this, how ...
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2 votes
1 answer
309 views

My Hydraulic Brakes Always Need To Be Pumped/Burped Before Braking Sharply

So my mechanic and I bled my brakes after it always needing to be pumped before it brakes, brake fluid came out black and seemed to have metal shavings at the bottom. The only problem now is weirdly ...
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7 votes
6 answers
2k views

Brake disc sometimes touching brake pad when not braking

I have a Whistle B-Race 7.1 e-bike that's about 3 months old. Recently the front disc brake has started touching the brake pads when not braking, when it does you can hear a "zing" sound. It ...
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  • 123
0 votes
0 answers
63 views

Initial resistance / detent feeling in hydraulic brake

My brake has a up-front amount of pressure it needs before it will then engage. It feels like I'm actuating a clicky button and not a continuously moving brake. What could be causing this?
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0 votes
2 answers
191 views

Is it normal for a rotor to move when brakes applied (hydraulic)?

I noticed a movement of braking disc when pressing rear brake and watching on rotor. It was moving about half millimeter. Is it normal for rotor to move minimally?
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0 votes
1 answer
106 views

Front disc brake caliper fixing bolts size

Can anyone please tell me the bolt size required to attach a flat mount hydraulic disc brake (SRAM replacement) to a set of Boardman carbon forks please.
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0 votes
1 answer
131 views

Best way to use Shimano 105 on an older frame

I have a cyclocross bike built on Shimano 105 (~2018), but the frame was too big for me, so I decided to buy a smaller one on the aftermarket and just move all my existing stuff to this frame. I found ...
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7 votes
4 answers
760 views

Heating of hydraulic oil with hardtail electric MTB brakes

I do an ebike commute here in NZ with a steep downhill at the end of the ride at night and a longish downhill in the morning.Brakes are Shimano Hydraulic MT200, 180mm Rotors and pads were Shimano ...
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4 votes
1 answer
418 views

Why is my hydraulic front disc brake clicking?

I noticed that there's a mysterious click that seems to be tied to wheel rotation when riding my bike. It is barely audible when there's no traffic nearby. I initially assumed that it's a hub or the ...
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7 votes
2 answers
222 views

Are clear hydraulic brake lines available for sale?

Since all brake lines are not see through, the only way to determine if your brake needs a bleed is by feeling the brakes. If they are "squishy", then you need a brake bleed. I'm of the ...
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0 votes
1 answer
94 views

Hydraulic disc brakes transportation

I'm planning on packing my bike for transportation with both wheels off. I have SRAM Apex disc brakes on the bike. What are the risks if ever the brake leavers get squeezed during transportation ?
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1 vote
1 answer
307 views

How to reduce brake lever rattling sound at the pivot pin either by a fix or by replacement?

Context I have a Merida Speeder 200 with a Shimano MT-200 hydraulic brake system, which uses BL-MT200 levers. Over time these levers have developed a rattling sound. It appears to come from the lever ...
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0 votes
2 answers
211 views

Another flatbar to dropbar conversion noob

I am thinking of changing my Boardman HYB to a drop bar setup. Trying to avoid having to change the entire group set if I being honest as I am on a tight budget. Currently, its Shimano Acera 2x9 and ...
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5 votes
2 answers
419 views

Can't bed in my hydraulic brake pads

I washed my bike with Rhino Goo fast action cleaner and fairy liquid in a spray bottle mixed with water. I used a hose pump with no pressure, so no liquid will go into my bearings etc. After I washed ...
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4 votes
2 answers
567 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 ...
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2 votes
2 answers
1k views

Is losing power when pulling Shimano GRX lever a bleed problem?

Recently I had an accident on my bike, and my front brake 11-speed, front brake GRX 600 shifter isn’t braking well anymore. The shifter took a bit of damage in the fall. Initially it didn’t shift, ...
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6 votes
2 answers
860 views

Is the banjo bolt the same between the Shimano XTR and Shimano Saint rear brake caliper?

Earlier today, I went to install a brand new Shimano Saint caliper in place of an old XTR that's leaking from the pistons, only to find that Shimano doesn't include the banjo bolt... Do the XTR and ...
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1 vote
1 answer
173 views

What's the difference between mechanical and hydraulic brake rotors?

I just bought some replacement brake rotors for my Shimano hydraulic system, the box says they are for mechanical brakes, anybody know if this should effect it??
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2 votes
2 answers
228 views

My hydraulic disk brake pads are rubbing too hard on the rotor after taking the wheel off

so these are Shimano saint hydraulic disk brakes and i took the wheel off the other day to clean it, put it back on, and for some reason the pads are rubbing overly hard (without actually pulling the ...
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1 vote
2 answers
486 views

Are there downsides to cross-top brake levers? Compatible with all mechanical-hydraulic disc brakes?

I have a Genesis Croix de Fer 20 from a few years ago with the following specs: Brakes: TRP HY-RD mechanical-hydraulic caliper w/160mm TR160 rotors Levers: Shimano Tiagra ST-4700 I would like to fit ...
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