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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59
votes
7answers
198k 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 ...
37
votes
6answers
177k 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 ...
30
votes
5answers
25k 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 ...
18
votes
3answers
23k 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 ...
18
votes
5answers
89k 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 (...
17
votes
4answers
5k 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 ...
17
votes
3answers
59k 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 ...
16
votes
2answers
23k 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-...
15
votes
5answers
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 ...
15
votes
2answers
7k 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 ...
14
votes
6answers
37k 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 ...
13
votes
4answers
13k 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?
13
votes
4answers
3k 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 ...
12
votes
9answers
26k 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 ...
12
votes
4answers
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....
12
votes
4answers
16k 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. ...
10
votes
3answers
5k 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 ...
9
votes
3answers
31k 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 ...
9
votes
3answers
87k 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 ...
9
votes
2answers
797 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?
9
votes
2answers
24k 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 ...
9
votes
1answer
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 ...
9
votes
1answer
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 ...
8
votes
3answers
7k 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 ...
8
votes
1answer
13k 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-...
8
votes
3answers
8k 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 ...
8
votes
2answers
1k 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 ...
7
votes
4answers
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 ...
7
votes
1answer
3k 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?
7
votes
3answers
1k 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 ...
7
votes
3answers
45k 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....
7
votes
4answers
2k views

Disc Brakes *Completely* Ineffective

Over recent months my front and rear disc brakes (Hy Rd TRP on my Genesis Croix de Fer) have become increasingly useless, to the extent that I now have to cycle very slowly because it takes at least 5 ...
7
votes
3answers
6k 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 ...
7
votes
3answers
3k 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 ...
7
votes
1answer
7k 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 ...
7
votes
1answer
12k views

Top up hydraulic brake fluid?

So I've just gotten a new bike which has disk brakes, and it's my first time using disk brakes. One of the brake pads is rubbing a little on the rotor, so I decided to turn the barrel on the lever ...
7
votes
4answers
9k 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 ...
7
votes
1answer
176 views

Using non-brand oil for cleaning brake pistons

I am having some problems with rubbing disc brakes and came to the conclusion that it might be because of "sticky pistons". I would like to clean and lubricate them, as here. This video ...
7
votes
1answer
1k views

What did I just do? Fluid shot out of my handlebar when pushing my caliper in

I just bought a new road bike with hydraulic disc brakes, using a Shimano Ultegra R8020 Groupset. The pad was rubbing on the rear rotor and it wouldn't recenter when pumping the brake. The brake lever ...
7
votes
1answer
624 views

Hydraulic brake lever doesn't return after being released, dependent on weather

I have a pair of second-hand Shimano ST-RS685 hydraulic brake levers / shifters. Unbeknownst to me they hadn't been used for a year and had quite a bit of dirt / grit inside, which I've cleaned to a ...
7
votes
3answers
439 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 ...
6
votes
4answers
927 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 ...
6
votes
1answer
2k views

why can't you use park tool shift cable cutter to cut hydraulic cable

I was going to use my parktool cable cutter on the hydraulic cable for my reverb. I would potentially service my hydraulic shimano disc brakes cables if I ever need to. But another thread has said ...
6
votes
3answers
1k views

Magura rim brake does not work well on a new rim

I have a bike with 20inch wheels and Magura HS11 rim brakes. On the rear wheel I have just replaced the rim, because the old one had split after many thousand kilometres. The new rim is an Alex DM24 ...
6
votes
3answers
15k views

Rear hydraulic disc sticking

My 2012 Model Scott Sub 10 has recently been experiencing issues with the rear disc sticking on my daily commute and getting so bad that I have to stop, wait for it to cool and then push the disc a ...
6
votes
2answers
98 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 ...
6
votes
2answers
7k views

Can road disc calipers be mounted on a mountain bike?

Are the mounting posts and position for road disc brake calipers the same as or similar enough to mountain bike disc calipers that you could put a set of road disc brakes on a mountain bike or vice-...
6
votes
2answers
1k views

What is the difference between DOT brake fluids?

I know that the two main categories are the mineral oil (Shimano, Magura) and the DOT type (Avid, Hayes). But what is the difference between the DOT 3, DOT4, DOT 5.1? Which one should I choose for ...
6
votes
7answers
2k views

How to get a broken torx bit out of a bleed screw?

In the latest episode of my disastrous bike maintenance attempts, I got a sub-standard torx bit that broke off in the bleed screw of my Tektro Vela disc brake caliper. Here's a sligthly overexposed ...
6
votes
2answers
15k views

How can I fix brake pads being too tight even after pushing the pistons back in?

I just got delivery of a road bike with SRAM Red disc brakes. It was delivered with little inserts in the brake pads to prevent accidental squeezing of the lever when the rotor was not in. When I put ...

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