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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7 votes
2 answers
363 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 ...
-1 votes
1 answer
71 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 ...
2 votes
1 answer
87 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 ...
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1 vote
2 answers
68 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 ...
  • 690
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 ...
  • 2,181
4 votes
2 answers
236 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 ...
2 votes
1 answer
72 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 ...
8 votes
1 answer
396 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 ...
0 votes
1 answer
84 views

Is it possible to use SRAM brifters with non-SRAM hydraulic brakes?

"SRAM hydraulic brakes are issue-prone." Even if this is a damning blanket statement heard about a major parts manufacturer, I am not here trying to argue it. It is simply a premise of my ...
  • 7,362
2 votes
2 answers
53 views

Shimano BR-M395 hydraulic brake pads keep rubbing

I've replaced the brake pads of my bike, Shimano BR-M395 with some BS03S (there were originally BS01S, but I have been told they are identical), but the new pads just keep on rubbing. I've even taken ...
  • 123
2 votes
2 answers
91 views

How to tell what service my MTB front hydraulic brakes need?

The front Shimano SLX (m7120) hydraulic disc brakes on my trail bikes have lost their mojo. It still brakes but less aggressively than a year ago. Possible causes are worn pads and air bubbles in the ...
  • 171
3 votes
1 answer
206 views

Magura brake pad change: friction noise?

After replacing my worn-out Magura brake pads (MT4 brakes, 7P brake pads), I now have a continous light friction noise when the wheel is spinning (front wheel). The brake disc is brand new as well. ...
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6 votes
1 answer
139 views

GRX disc brake loses power when slowly braking

I have a GRX 400 hydraulic caliper and a GRX 600 2 speed front shifter. When I pull the front brake lever hard, the brake works as intended. If I pull it slowly, or repeatedly tap it, then I lose ...
  • 161
2 votes
0 answers
83 views

Can't seem to quiet my disc brakes

I recently purchased a bike that clearly needed fixing, for a great price. I've given the bike a bit of a tune-up, but one thing that won't seem to go away is the squealing sound coming from the disc ...
  • 121
2 votes
1 answer
134 views

Shimano hydraulic brakes underperforming - water fixes the issue

I have a Shimano XT BR8100 system, all was good until I did some maintenance. Probably I did something wrong, trying to understand what. Did a normal procedure to replace oil and pump out air. Visible ...
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3 votes
2 answers
220 views

Hydraulic Disc Brakes still Spongy after bleeding?

I have Tektro HD-M276 Hydraulic Brakes that were recently spongy (front brake). After bleeding the system and topping the fluid off, the bite was much firmer, but when I test rode it, the braking ...
  • 31
6 votes
4 answers
2k views

Mechanic told me to replace the entire brake system because of "slow return"?

A bit of back story first: I bought a second-hand bike in 2020. It has SRAM Level TL installed from the start. It caught my attention that brake lever didn't return to the end and had very little ...
  • 922
8 votes
0 answers
210 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 ...
5 votes
1 answer
698 views

Is a bit of disc brake rubbing normal? [duplicate]

I bought a new roadbike with shimano ultegra hydraulic disc brakes. After I rode a couple thousands km, my disc brake pads started to rub the rotor, but just a little bit (it barely touches it, I can ...
  • 591
3 votes
1 answer
128 views

Brakes rubbing on ride after centering, brand new bike

I recently purchased a new mountain bike. The brakes are Clark M2 hydraulic disc brakes. The bike came pre-assembled except for the pedals, handlebars, and front wheel. I don't see anything wrong with ...
1 vote
1 answer
134 views

Upgrade shimano tiagra mechanical disc to tiagra hydraulic disc brakes

I currently have a Scott Speedster 20 with Tiarga 10 speed mechanical disc brakes. Is it possible to upgrade my brakes with the hydraulic version of the tiagra groupsset (by just buying these parts e....
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3 votes
2 answers
357 views

Immense difficulties bleeding a shigura setup

I set up a shigura system with BL-M8000 levers, MT5 and MT4 Callipers and Magura hoses and shimano parts on the lever end. But I couldn't get even a decent bleed on them. I tried a couple of ...
4 votes
1 answer
93 views

Can an out of alignment brake caliper lead to the piston falling out?

The hydraulic brake caliper on my bike is slightly out of alignment. It's not fully rubbing, it more or less looks like the slight rub picture here - https://www.parktool.com/en-int/blog/repair-help/...
2 votes
1 answer
71 views

Disk brake piston jammed

I bought a second-hand mountain bike which as far as I can tell has not been well maintained. The pads were very worn so I replaced them and replaced the disks. Now they keep rubbing. The brakes will ...
1 vote
1 answer
79 views

How to get my hydraulic disk brake working again?

I have a bike with a hydraulic disk brake and have been observing some degraded performance recently. Yesterday I finally had a close look and noticed that one brake pad permanently touches the rotor. ...
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3 votes
1 answer
350 views

Did I mess up my front brake pressure?

My Bike: Ghost - HYBRIDE KATO 3 AL 29 The first problem was that my front brake disc grinded on the brake. I tried to adjust the brake -> didn't work Then I replaced the braking pads which also ...
  • 176
1 vote
0 answers
127 views

What Would Cause My Shimano Front Disc Brake to Leak after Replacement?

I noticed my Shimano BT M400 front brake caliper was missing the cap for the bleed nipple and the whole set up was covered in mineral oil. After speaking briefly to a mechanic I bought a replacement ...
  • 11
2 votes
0 answers
116 views

Shimano BR M8000 callipers leaking after bleed

A couple weeks ago I noticed that the brakes (BR-M8000) on this bike were quite spongy and since I didn't know when there last bled was, I decided to service them. Everything worked fine for about a ...
5 votes
2 answers
90 views

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 vote
2 answers
298 views

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 ...
  • 261
3 votes
2 answers
238 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 ...
2 votes
0 answers
76 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 ...
1 vote
0 answers
194 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 ...
  • 3,247
7 votes
1 answer
403 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-...
  • 529
1 vote
0 answers
128 views

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 ...
  • 351
0 votes
1 answer
292 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 ...
  • 742
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 ...
  • 277
12 votes
4 answers
800 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
239 views

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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1 vote
0 answers
70 views

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 ...
3 votes
1 answer
182 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 ...
2 votes
3 answers
353 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 ...
0 votes
4 answers
264 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 ...
  • 7,362
4 votes
1 answer
753 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 ...
  • 397
12 votes
1 answer
2k 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 ...
  • 13.2k
3 votes
3 answers
292 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 ...
1 vote
1 answer
705 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 ...
  • 169
3 votes
3 answers
720 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 ...
1 vote
1 answer
967 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 ...
  • 165
2 votes
2 answers
181 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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