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2
votes
1answer
100 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 ...
0
votes
2answers
40 views

Tips for adjusting Shimano M355

I have upgraded from cheap old front cable disks brakes and rear v-brakes to Shimano hydraulic M355's front and rear. I always adjusted my old brakes for a very tight fit (to reduce dead space between ...
0
votes
0answers
42 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 ...
7
votes
2answers
405 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 ...
22
votes
4answers
11k 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 ...
0
votes
2answers
372 views

Front disc brake noise only at high speed

At a high speed (about 50km/h, but not sure exactly, as I don't have a speedometer) the disc starting to noise like it is touching the caliper/pad. At low speeds It doesn't noise and it's rotating ...
4
votes
3answers
2k 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 ...
1
vote
2answers
101 views

Rotors bent very slightly but no rubbing. Is driving safe?

I just bought Rockrider 520 with Tektro Auriga Comp hydraulic disk brakes on it. I didn't ride it yet. Both brake rotors have a very slight bent and no rubbing. Just nearing both pads every round and ...
1
vote
1answer
93 views

Do Shimano disc brakes need post mount spacers?

I am switching my rear Avid Elixir brake for a Shimano XT one, but I am a bit unsure about mounting the caliper. The Avid brakes had spacers that put the brakes in the right position for the 160 mm ...
1
vote
3answers
136 views

Hydraulic disc brakes - total friction as a function of rotor size

I have a hydraulic disc road bike with a 160mm rotor on the front and a 140mm on the rear. The setup is exactly the same front to rear, except for rotor size. I'd like to know the disparity between ...
0
votes
1answer
148 views

Hydraulic disk brakes starts braking after pulling the half of the lever, how can I solve this problem with the brakes?

I have upgraded from v brake which starts braking immediately after pulling the brake lever, but in my new bike the brakes starts much later after pulling the lever. What problem it may have? I am ...
2
votes
5answers
695 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. ...
2
votes
1answer
119 views

How to remove existing fluid before bleeding disk brake

I've found lots of tutorials on how to bleed the disk brakes. And in all of them there is nothing about removing existing fluid. I'm quite afraid that when I start to bleed brakes the existing fluid ...
2
votes
1answer
191 views

Can I use a 6mm threaded bolt instead of a bleed valve for hydraulic brakes?

I've accidentally lost the bleed valve in a front-brake "bleed gone wrong" afternoon and was wondering whether there's anything detrimental in just using a 6mm bolt instead for the time being?
0
votes
3answers
1k views

Hydraulic Brake Loud Noise and Vibration

I have a shimano br-m446 installed in my MTB, i recently replaced it with new pads, my problem is that it is squealing so bad, with a mild to moderate vibration during braking in downhills. and it's ...
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
2answers
163 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. ...
0
votes
1answer
406 views

Disc brake clicking noise

I just took my rear tire off of my mountain bike that has hydraulic disc breaks (elixer5). When I put the wheel back on and started peddling it made a clicking sound. At first I thought it was the ...
0
votes
0answers
52 views

Disc brake lines quite long [duplicate]

Currently building a new mountain bike. I'm fairly bike savvy and have built quite a few bikes over the years, but mainly road bikes. I have installed/fitted a new Shimano slx group set and the ...
1
vote
1answer
2k views

Adding disc brake to a bike without rear disc brake mounts

I'm seeking advice on how to install disc brakes on a bike that does not have rear disc brake mounts. The bike I have is the Trek 7.1 FX. Does the Trek 7.1 FX have the mount for installing disc ...
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 ...
9
votes
3answers
5k 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 ...
5
votes
1answer
206 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 ...
4
votes
1answer
653 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 ...
13
votes
3answers
10k 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 ...
11
votes
4answers
2k 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 ...
0
votes
1answer
386 views

Slow lever return after shortening brake line and bleeding

I've just recently replaced the brakes on my MTB with a pair of Shimano XT hydraulics. The rear brake line was extremely long for my frame's routing, so I had to cut it and subsequently bleed the ...
0
votes
2answers
219 views

Hydraulic brakes feel loose

I have a bike with Avid hydraulic brakes. The levers feel loose and at the end of pushing it, there is a "soft" feeling (like when V-brakes pads aren't adjusted properly). As I understand, it's air ...
12
votes
3answers
8k 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 ...
1
vote
2answers
1k views

How do I tell the size of my braking discs?

Looking to replace my hydraulic disc brakes but intend to use the old discs. How do I tell the size of the discs to ensure I purchase the right brakes?
3
votes
2answers
1k 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
2answers
863 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 ...
10
votes
2answers
2k 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 ...
0
votes
1answer
2k 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 ...
6
votes
3answers
6k 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 ...
-1
votes
3answers
537 views

New commuting road bike. Wishlist: discs & electronic gears [closed]

After reading Evans Cycles' blog post the other day about disc brakes on road bikes: ...
4
votes
2answers
1k 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 ...
9
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 ...
2
votes
2answers
1k 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
1answer
1k 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 ...
17
votes
3answers
30k views

Hydraulic Vs. Mechanical disc brakes

What is the difference between hydraulic and mechanical disc brakes? Are hydraulics more reliable? Or more powerful? All I know (I'm an amateur and a new user) is that hydraulics seem to get more ...
3
votes
2answers
2k 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, ...
3
votes
2answers
891 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. ...
6
votes
5answers
5k 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 ...
3
votes
5answers
3k 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
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 ...
1
vote
1answer
249 views

5 Month old bike, pedals and brake issue

got a Merida Matts 40-D bike in September/October, now I'm having some issues and need some help fixing them. Bearing in mind I've had this bike that long, I didn't start riding it until mid October ...
5
votes
1answer
3k 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
6answers
6k 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 ...
7
votes
4answers
1k 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 ...