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30
votes
5answers
72k 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 ...
25
votes
5answers
14k 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 ...
16
votes
5answers
4k 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
3answers
19k 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 ...
13
votes
3answers
12k 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 ...
11
votes
4answers
3k 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 ...
11
votes
3answers
4k views

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

I heard somewhere that bikes with hydraulic brakes should not be put 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 ...
10
votes
2answers
6k 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 ...
9
votes
3answers
10k 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 ...
8
votes
7answers
10k views

Is there a reason for brakes to be reversed in bikes with Hydraulic Brakes?

I recently bought a MTB with Hydraulic Disk Brakes, and am finding really hard to adjust with the braking system. From the very beginning I was cycling with Front brakes on right hand. But now its ...
8
votes
3answers
6k 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. ...
8
votes
1answer
621 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?
8
votes
1answer
791 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 ...
7
votes
4answers
2k 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
2answers
748 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 ...
6
votes
5answers
8k 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 ...
6
votes
3answers
9k 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
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
3answers
2k 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 ...
5
votes
4answers
2k 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 ...
5
votes
1answer
736 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 ...
5
votes
2answers
203 views

Disc brake maintenance

For some days now I am observing the decreasing performance of my disc brakes on my MTB. Additionally, braking is extremely loud (squeaking). I don't think I have oil or fatty substances on the discs. ...
5
votes
1answer
131 views

Hydraulic Brake lever becoming stiffer

What are the factor(s) that would make the brake lever of a hydraulic brake become stiffer over time? By stiffer, I mean that the lever becomes more difficult to pull, it offers more resistance and I ...
5
votes
1answer
225 views

Why would anyone use DOT fluid and vacuum-based brakes?

Mineral oil is much less toxic than DOT, does not absorb water, has higher boiling point. Bleeding Shimano brakes is almost as easy as unscrewing the caliper bolt and pouring oil into the lever ...
5
votes
2answers
6k 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 ...
5
votes
4answers
4k 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 ...
5
votes
1answer
4k 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 ...
5
votes
1answer
1k views

One stripped post mount on suspension fork

I have a suspension fork, which has a stripped lower post mount, i.e. the bolt used to attach the brake caliper doesn't grip the post. Before anyone asks - yes, it is the correct size bolt, as the ...
5
votes
1answer
279 views

Shimano Hydraulic disc brakes- Lever compatibility

I am looking for practical advice on compatibility between various Shimano hydraulic disc brakes, especially the lever assembly. Currently I have two separate sets, one M446 Left lever, attached to a ...
5
votes
2answers
2k views

odd noise on new disc brakes

After 200 miles on my LaPierre X Control 229 equipped with basic Avid hydraulic disks, I can hear the front wheel disk ventilation slots grinding through the caliper when I brake moderately! (Shimano ...
4
votes
4answers
136 views

Does brake modulation matter, for efficiency, beyond having enough to avoid locking the wheels?

Edit: To Clarify this is regarding going as fast as possible, i.e. racing, off-road. I can't see why "modulation" matters so long as you have enough to apply near maximum braking force without ...
4
votes
2answers
235 views

How often do you need to bleed your Avid Elixir 1

I have a Trek bike with Avid Elixer 1 hydraulic brake. Not sure if it's a manufacture defect but I have returned to the shop 3 times since I bought the bike this April, for them to rebleed. The ...
4
votes
3answers
10k 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 ...
4
votes
2answers
2k views

What is the difference in procedures for bleeding different disc brakes?

I want to learn to bleed my new disc brakes. While there is a wealth of knowledge on the topic, it is difficult to tell the difference between pedantic explanations and sloppy work. In the official ...
4
votes
2answers
107 views

Troubleshooting Hydraulic Disc Brakes

I replaced the fluid in my hydraulic disc brakes as they would not work within the first 10 minutes of cycling and would gradually sharpen up. I suspect they had air in the system. They were sharp ...
4
votes
1answer
64 views

Brake bleeding without bleeding block

Is it ok to bleed my brake without a bleeding block and without removing the wheel? What is the effect on the lever? Will this result in a less firm lever?
4
votes
1answer
2k views

What do I have to know, to replace my hydraulic disc brakes with new ones?

I want to buy a new hydraulic disc brake for my old mountain bike, which already has a disc brake. As I am very far away from any bicycle shop I want to buy the parts on the internet. The shipping ...
4
votes
1answer
2k views

Hydraulic brake cable invisible leak. Possible?

I've crashed hard, handlebar rotated as much as it could and I guess rear brake cable was stretched. Braking became soft. Time to bleed I thought. But I'm completely unable to bleed it. Tried some ...
4
votes
2answers
2k 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 ...
4
votes
2answers
307 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 ...
4
votes
0answers
36 views

Cylinder volume of hydraulic brakes and levers

I've been asking around for a while now but even workshop pros couldn't answer this (by citing exact figures): How big are the brake cylinders of disk and rim brakes in terms of volume and surface ...
3
votes
5answers
4k views

A bike for city commute - disc brakes, bar-end shifters, tires

I'm planning on buying a bike for city commute. My commute to work is approximately 12km (7.5 miles) one way. I live in Vancouver which means: I'll be riding in rainy weather frequently. I'll be ...
3
votes
2answers
90 views

Upgrading to new hydraulic brakes - should I put same sized rotors on front and rear wheel?

I would like to upgrade brakes on my bike but I have a dilemma / question - currently, on my front wheel there is 180 mm rotor and on back wheel there is 160 mm rotor. Is there any reason why bike ...
3
votes
3answers
4k views

could I mount a different manufacturer brand rotor to use with my brakes?

I've a tektro draco hydraulic brakes on my mtb and I would like to know if it is possible to mount a different brand rotor to use with my brakes?
3
votes
2answers
7k views

How do I cut hydraulic brake hose without expensive tools?

I've seen some expensive hydraulic hose cutting tools. I just want to cut the two new brake hoses I have now, so I don't want to buy an expensive tool. I want to do it myself, and I don't mind ...
3
votes
1answer
2k views

How do to determine if an adapter is needed for disc brakes and rotors?

I have an old older (not too old) bike that already has disc brakes, but I would like to replace them with a totally new set and new rotors. How can I determine if a given replacement (caliper and ...
3
votes
1answer
162 views

What is the hydraulic brakes expected life?

I bought a pair of hydraulic brakes (Shimano BL-M395) for my MTB. After 8 months (less than 1,000 kms), both (front/rear brake) started to leak oil thru pistons, rendering pads contaminated and the ...
3
votes
1answer
590 views

RockShox Tora TK mountings for Hope Mini M4

I'm on the verge of buying a RockShox Tora fork for my bike, and plan to use them with Hope Mono Mini M4 brakes. I'm stumped as to what mounting to buy for these, how do you guys find out this ...
3
votes
1answer
140 views

The piston on my Avid Elixir 5 brakes popped out. Does the caliper need to be rebuilt?

One of the pistons popped out of the caliper on my Avid Elixir 5 brakes. Can I just put the piston back in and bleed the brakes and then they will be good as new, or do I have to rebuild the whole ...
3
votes
2answers
3k views

Will any Avid brake bleed kit work with my Promax brakes?

I need to replenish the fluid in my front brake on my Whyte Portobello (Promax Hornet disk brake) after all of the fluid leaked out through my own mistake. I'm looking at kits like this on eBay, ...