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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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18 votes
3 answers
68k views

do I need to change my disc if the brake pads got oil on them

In trying to change the brake pads on my mountain bike, I managed to get oil on my new pads and empty out all the brake fluid, and consequently also get some oil on the disc. I took the bike to the ...
Poorav's user avatar
  • 303
5 votes
1 answer
5k views

How do I get rid of the noise on my Hayes Stroker Trail brakes

I recently bought a new bike that came with Hayes Stroker Trail hydraulic brakes. From day one they were squeeky and not very grippy. I wrote it off to the burn in period that most disc brakes ...
Bizee Biker's user avatar
42 votes
6 answers
225k views

How do I separate hydraulic disc brake pads after pulling the brake while the wheel is off?

I take the front wheel off my mountain bike to get it in my car. When I get it out and try to put the front wheel back on, the space between the brake pads isn't wide enough for the rotor. Whoops! I ...
Phil Hale's user avatar
  • 1,571
7 votes
3 answers
46k views

How do I get my hydraulic disc brakes working well again

I just bought a new bike (my first brand new one ever) a few months ago and a while ago I decided to give it a wash and after that my front hydraulic brake hasn't been working as strong as it used too....
Falcon rider's user avatar
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 ...
Axemasta's user avatar
  • 323
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 ...
Wesley Crusher's user avatar
21 votes
3 answers
32k views

Is it harmful for a hydraulic brakes bike to be put upside down

I have heard that bikes with hydraulic brakes should not be left upside down. If they are, 15 minutes should be allowed before the bike is used. Is there any truth in this? What process could be ...
Vorac's user avatar
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12 votes
4 answers
128k views

Hydraulic Disk brake piston not fully retracting

My front disk brake's piston doesn't fully retract. While I can ride the bike, the brake is slightly rubbing. (IE, if I just spin the wheel with my hand, it'll go around about one and a half times ...
Alex's user avatar
  • 323
10 votes
2 answers
26k views

Should rotors have no rub at all?

I just installed a new front disk brake and the rotor rubs a bit once per rotation. If I take the rotor off and place it on flat surface, it seems totally flat but once installed I can see/hear it ...
Alex's user avatar
  • 323
3 votes
4 answers
635 views

Is this bike suitable for a male

Is this bike suitable for men?
user7158853's user avatar
17 votes
2 answers
8k views

Hydraulic Disc Brakes Maintenance

I have Hayes Nine hydraulic disc brakes on my mountain bike. I have recently replaced the brake pads and after that it seems that the pads are almost touching the rotor. How can I adjust it? I have ...
kristof's user avatar
  • 941
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 ...
Mick's user avatar
  • 746
9 votes
2 answers
866 views

How do I change my disc brake pads?

How do I change my disc-brake pads? How do I avoid letting the fluid out?
Johan Dahlin's user avatar
  • 2,908
7 votes
3 answers
8k views

Converting road hydraulic disc brakes to flat bar : Possible?

I bought a road bike recently and find the road position too uncomfortable for commuting in the city, especially for reaching the brakes fast and slaloming between cars. Therefore, I would like to ...
Standaa - Remember Monica's user avatar
7 votes
3 answers
576 views

Will hydraulic brakes work with vertical underseat recumbent handlebars?

I have this type of recumbent. I want to upgrade to hydraulic brakes, but every bike shop warns me about the issues that will come from attaching the brake levers in a vertical position. They say that ...
Euphorbium's user avatar
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 ...
sergiol's user avatar
  • 402
4 votes
2 answers
4k views

Brake pads constantly touching the rotor because piston is not moving back

I recently replaced the brake pads on my hydraulic disc brake. The brakes are a Tektro Draco 2. Now the new pads are constantly touching the rotor. This is how it looks like with caliper unmounted. ...
mles's user avatar
  • 301
3 votes
2 answers
562 views

Front disk brake squealing

I know that squealing brakes are fairly typical questions but I have not found a solution yet. My bike is a Haibike with Tektro Auriga Comp hydraulic disk brakes and in recent years I ride in ...
Czechnology's user avatar
3 votes
5 answers
2k views

how do i stop my Formula disk brakes from squealing

I have seen a number of posts about stopping discs from squealing, but mine don't always squeal, when the squealing starts it doesn't stop (as if something has worn off) and it's not worn out pads. ...
ryancrawcour's user avatar
2 votes
4 answers
2k views

Disk brakes severely reduced in power after replacing bearings

so I am creating a few posts about bearings and wheels, (story so far): how to reassemble mountain bike rear wheel hub and bearings mountain bike freewheel hub stopped rotating I have now got the ...
Jon's user avatar
  • 507
1 vote
1 answer
2k views

Shimano disc brake hose compatibility

I have a bike with Shimano XT disc brakes, model BR M775, which have too short brake lines for my new stem. So I want to replace them with longer brake lines. But when I go shopping for brake hose, ...
Kenned's user avatar
  • 597
35 votes
7 answers
29k views

How do self-adjusting hydraulic disc brakes work?

I have Avid Elixir brakes on my mountain bike. They are the only part of the bike that's a total black box to me. I understand the principle behind disc brakes, and I understand the principle behind ...
Benson's user avatar
  • 1,536
22 votes
5 answers
102k views

How often should hydraulic disk brakes need bleeding?

The brake handles for my disk brakes became very loose four months after I bought the bike. The bike shop bled the brakes and put new oil in them, which sorted it. They're feeling a bit loose again (...
Richard's user avatar
  • 579
15 votes
5 answers
7k views

What type of brakes are best for mountain bike racing?

Disc brakes are more expensive than v-brakes, but in a heavy rain they will break down. V-Brakes are becoming harder to find, but they're much easier to maintain and don't break down as easily. What ...
Johan Dahlin's user avatar
  • 2,908
13 votes
4 answers
19k views

Do I need to replace hydraulic fluid in my brakes?

I've had my bike (GT Avalanche 1) for maybe four or five years now. I've changed the pads once, removed and cleaned all parts on the bike a few times now, but I've never touched the brake fluid. ...
Mick Sear's user avatar
  • 479
12 votes
4 answers
1k 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. ...
Chris H's user avatar
  • 60.3k
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 ...
Paul Suart's user avatar
9 votes
3 answers
12k views

Can a Shimano XT (mountain) hydraulic disc brake caliper be used with an Ultegra STI road brake lever?

Specifically, is the XT BR-M8020 mountain caliper compatible with an Ultegra hydraulic road brifter like like the ST-R8020 or ST-R8070? I have confirmed that they both use BH90 brake hose ("high ...
John McD's user avatar
  • 175
9 votes
1 answer
23k views

How to install pre bled brakes with internally routed frame

I have a 2017 Salsa Mukluk with an internally routed rear brake. I bought Shimano XT hydraulic brakes to replace the low end mechanicals that came on the bike. My problem is that the brakes came pre-...
Ben Mills's user avatar
  • 509
9 votes
1 answer
1k views

Tips for Bleeding Hayes Brakes

Does anyone have any tips for bleeding Hayes brakes? I have some Hayes Stroker Ryders and bleeding them is less than fun compared to bleeding my Avids. Do they make any syringes for bleeding the ...
Geoff's user avatar
  • 1,389
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, ...
JRE's user avatar
  • 197
7 votes
4 answers
3k views

Would hydraulic disc brakes be easier on my hands than mechanical disc brakes?

I ride MTB in a coastal town where all roads are dirt roads with lots of uphill/downhill. Nothing extreme, I just ride to relax and enjoy the landscape. I have mechanical disc brakes and after a 2-4 ...
user avatar
6 votes
2 answers
2k 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 ...
Kellen Stuart's user avatar
6 votes
4 answers
5k views

Why would hydraulic disk-brakes become sluggish in cold winter? Just an incident or due to the cold?

Related question, I haven't bled the brakes (again a possible error). I bought the bike as second-hand and the seller said that the mineral oil cannot be the problem. He said that the mineral oil in ...
user avatar
5 votes
1 answer
4k views

Shimano hydraulic disc brake lever and caliper compatibility

My bike has Shimano BR M775 brake calipers and BL M775 brake levers. The right lever for the rear brake has a broken screw in the reservoir, so it needs replacement. As BL M775 is no longer available ...
Kenned's user avatar
  • 597
5 votes
2 answers
10k views

How do I prevent the Hydraulic Disc Brakes on my bike from rubbing?

I recently bought a new Polygon Strada 5.0 mountain bike with Shimano BR-M355 hydraulic disc brakes and have had issues with the brakes rubbing. I fixed the rub but now it is happening again. The ...
Padang's user avatar
  • 51
5 votes
1 answer
3k views

Magura rim caliper and Shimano hydraulic road lever compatibility

I have a trekking bike with a slightly short reach for me. On the other hand I wish to get a drop bar bicycle. I could check on this bike that the position is good with drop bars. On this bike I have ...
rvil76's user avatar
  • 734
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 ...
Chris Wilks's user avatar
4 votes
2 answers
1k views

What to replace after using WRONG hydraulic fluid

Tektro Auriga Comp hydraulic brake. I needed to add fluid to my brake, and decided to do a bleed. I used DOT 3 fluid instead of mineral oil (Very stupid me). after a few days my brake went dead (there ...
DAG's user avatar
  • 41
4 votes
4 answers
8k 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 ...
Thomas's user avatar
  • 41
4 votes
1 answer
258 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 ...
Jash2204's user avatar
4 votes
2 answers
12k views

Disc brake rotor compatibility and recommendation

I have Ultegra BR-RS805 flat mount hydraulic brakes on my gravel bike, and Shimano RT86 6-bolt Ice Tech 160mm rotors. There's a shim between the brakes and the frame to fit the 160mm rotors. When the ...
Ben W's user avatar
  • 153
3 votes
3 answers
1k 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 ...
bluppfisk's user avatar
  • 175
3 votes
2 answers
6k views

Air in hydraulic brakes after bleed

Today I bled an Avid Elixir 1 after it had gone soft over the winter. I followed the directions in the Park Tools Big Blue Book completely, used an Avid bleed kit and opened a new bottle of DOT 5.1. ...
DWGKNZ's user avatar
  • 8,867
3 votes
1 answer
139 views

Pistons are aligned only without pads in

I've reset the pistons (after taking the pads out) of my XT hydraulic brakes, and made sure they do extract evenly when operating the lever. After putting the pads and the wheel back in (and adjusting ...
PIXP's user avatar
  • 493
2 votes
2 answers
3k 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, ...
spikeheap's user avatar
  • 123
2 votes
5 answers
4k views

What are the typical range of maximum braking friction forces?

There are many non-bike applications which benefit from using bicycle hardware. Case in point, there is a long and rich tradition of using bike parts in aviation. One particular area of interest is ...
Kenn Sebesta's user avatar
2 votes
1 answer
23k views

New bike's disc brake rubbing the pads

there, I just got a new motobecane bike off of bikesdirect and it comes with this disc brake SHIMANO DISC-BRAKE SET ULTEGRA, ST-R8000, BR-R8000 FOR 25MM MNT, RESIN PAD SHIMANO KSMMAR160DDA MOUNT FOR ...
Nik So's user avatar
  • 165
1 vote
1 answer
3k views

TRP HY-RD brake pistons won't retract to take new pads [duplicate]

I'm replacing pads on my TRP Hy-Rd brakes. These are cable actuated hydraulics. Using tire levers, wrenches, etc. I have not been able to push the two pistons far enough apart to fit the rotor between ...
Jake's user avatar
  • 143
1 vote
2 answers
1k views

Does an adapter for a flat mount caliper to post mount fork exist?

I have a CAAD12 disc which I'd like to fit SRAM Force 22 hydraulic to. I've been a bit enthusiastic buying things without really researching all the pitfalls of the different bits and bobs that go ...
ilikeprogramming's user avatar