Skip to main content

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.

Filter by
Sorted by
Tagged with
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
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
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
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
  • 13.8k
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
17 votes
9 answers
5k 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 ...
Cristik's user avatar
  • 285
17 votes
4 answers
7k views

Why did the hydraulic disc brake stop working when riding down a steep mountain?

I rode my mountain-bike with a bicycle trailer attached. Three kids (age 4 to 8) were inside the trailer (trailer made of steel). We went down from about 500 m above sea level to 150 m above sea level ...
erik's user avatar
  • 355
17 votes
2 answers
24k views

Why are single-speed bikes with disc brakes hard to find?

I've been looking around for bikes (decent frame & components), and find that hybrids do have disc brakes (hydraulic), but are never single-speed. While single-speed bikes typically have linear-...
Baumr's user avatar
  • 1,585
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
16 votes
4 answers
5k views

Are bleeding kit syringes single use?

I recently bought a bleed kit (for shimano brakes from shimano) and used it on my hydraulic brakes (successfully as far as I can tell). During cleaning up I noticed the syringe says it was for single ...
pseyfert's user avatar
  • 1,023
15 votes
6 answers
47k views

How do I prevent my hydraulic brakes from getting pressed/damaged when the wheels are off?

When I was buying my bike, the technician in the shop told me not to press the brakes when the wheels are off (detached), otherwise the brakes will get damaged (I don't know how). I need to detach ...
Frantisek's user avatar
  • 1,139
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
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
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
13 votes
4 answers
18k views

Can storing bicycles upside-down damage hydraulic brakes?

I usually store our bikes for the winter hanging upside down by the wheels from the rafters. I would assume that I can't do this with a hydraulic disc brake bike: am I correct?
Wayne's user avatar
  • 131
12 votes
9 answers
30k views

Is there a reason for levers to be reversed on bikes with hydraulic brakes?

I recently bought a MTB with hydraulic disk brakes, and am finding really hard to adjust to the braking system. From the very beginning I was cycling with the front lever on the right. But now it’s ...
Starx's user avatar
  • 2,958
12 votes
4 answers
2k views

What is this stamped metal piece that fell out of a new hydraulic shifter?

I’m finishing setting up a new bike, and right as I finished bleeding and shifting around the left shifter (r7025), this little stamped steel bit fell out. It’s about 11mm in diameter and 0.5mm thick....
Ben's user avatar
  • 123
12 votes
1 answer
5k views

How do I rebuild Shimano XTR hydraulic 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 ...
MaplePanda's user avatar
  • 15.9k
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
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
11 votes
1 answer
1k 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 ...
calofr's user avatar
  • 1,089
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
10 votes
1 answer
3k views

Shimano RS785 hydraulic disc brake caliper will not reset

Brand new RS685 lever and RS785 calipers. I installed the front with no trouble. Shortened line, bled, ready to go. The rear, however, was a problem. I shortened and bled the line same as the ...
Jeff's user avatar
  • 188
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 ...
SamA's user avatar
  • 2,696
9 votes
3 answers
34k views

What is the benefit of a larger disc rotor?

What real benefit does having a larger rotor give to braking performance? Additionally is my assumption correct that you callipers don't actually change in size, just the rotor and the adapter need ...
DWGKNZ's user avatar
  • 8,867
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
3 answers
2k views

What is the purpose of bedding in disc brake pads? And what if the procedure is not followed?

When installing new brake pads for disc brakes, manufacturers recommend to "bed in" the pads. For example, Magura recommends to go 30kph then brake hard and repeat this process 30 times. ...
Rеnаud's user avatar
  • 21k
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
503 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 ...
parisminton's user avatar
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
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
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
2 answers
3k views

Shimano Hydraulic brake 90-degree angle hack

Does anybody know of a way to get Shimano Hydraulic brake hoses to exit the levers at a 90-degree angle? I ride a recumbent and at the moment I have to put up with a huge loop in front of my eyeline ...
Mike's user avatar
  • 91
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
8 votes
3 answers
10k views

Hydraulic disk brake stops working when hot; back to normal after cooling - is this expected?

I have experienced a strange failure of my brake. I was descending a steep smooth road, using only my front brake (my rear brake was broken; it was an unplanned bail from a route). I tried keeping ...
anatolyg's user avatar
  • 1,263
8 votes
6 answers
6k views

Bleed port repair on Shimano road brake lever?

I noticed that a small amount of mineral oil had leaked from the bleed port on my Shimano road brake lever. I inspected the bleed port screw and saw that it was loose. The threads on the lever ...
sdgfsdh's user avatar
  • 887
8 votes
1 answer
6k views

Is there way to fix a disc brake rotor if slightly bent?

Rear disc on my Acid 2016 is little bit bent so while riding it makes a strange noise when that part of disc comes through the caliper. Is there any way fix that or should I buy new disc?
user40478's user avatar
8 votes
6 answers
10k 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 ...
Mick's user avatar
  • 746
8 votes
2 answers
699 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 ...
olliebulle's user avatar
  • 4,139
8 votes
3 answers
4k views

Disk brake has never worked properly from new, pads replaced - still rubbish!

I've got Shimano hydraulic disc brakes and ever since I've had the bike (from new) the front brake has never worked properly. It used to squeak really loudly and perform badly but I assumed they just ...
DavidMasters84's user avatar
8 votes
1 answer
9k views

Should brake fluid come out of a misaligned disc caliper piston?

I have a shimano XT hydraulic disc brake system. While servicing it I took out the pads an checked the pistons in the caliper and noticed that only one is extracting. After a few pulls on the lever ...
PIXP's user avatar
  • 493
8 votes
4 answers
10k views

Can I put bullhorn bars on a bike with hydraulic disc brakes

The most comfortable bike I've ever owned was a road bike with bullhorn (aka pursuit) bars. I actually had a pair of STI levers on it, mounted upside down (with the handles pointing forward). They ...
stib's user avatar
  • 1,555
8 votes
1 answer
593 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 ...
BetterSense's user avatar
  • 3,446
7 votes
6 answers
3k 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 ...
Yeeter's user avatar
  • 123
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
7 votes
4 answers
868 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 ...
Ian Hankin's user avatar
7 votes
6 answers
4k 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 ...
Jim's user avatar
  • 97
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
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

1
2 3 4 5
9