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35
votes
6answers
82k 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 ...
15
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 ...
2
votes
1answer
1k views

Disc brake clicking noise

I just took my rear tire off of my mountain bike that has hydraulic disc brakes (elixer5). When I put the wheel back on and started peddling it made a clicking sound. At first I thought it was the ...
1
vote
2answers
5k 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?
1
vote
1answer
79 views

My brakes get mushy under heavy pressure

I have some Avid Juicy 5 on my Specialized SJ FSR '08 and the front brake gets mushy and looses brake power on long downhill trails. Do I have to purge the brake lines to get performance back on ...
4
votes
1answer
115 views

hydraulic brakes not working very fast

Ok, so I just got new hydraulic brakes, I have not had any like these and they were fitted by professionals and they had replaced the pads as I had contaminated the old ones. After getting these ...
1
vote
0answers
49 views

Hydraulic Disc Brake Pad Replacement

I have AVID Juicy Brake pads, the time has come to replace the front pads. The old pads are very worn. The new ones have lots of "pad" compared to the old ones, of course. I've tried to install the ...
1
vote
0answers
54 views

Will running hydraulic brake levers upside down affect performance [duplicate]

I purchased a pair of tektro draco disc brakes recently. They arrived with the hydraulic lines setup moto style, with the longer line run for the left brake lever and the shorter run for the right ...
0
votes
3answers
873 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 ...
6
votes
2answers
61 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 ...
4
votes
1answer
81 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 ...
4
votes
3answers
8k views

Tips for adjusting Shimano M355 hydraulic brakes

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 ...
4
votes
1answer
164 views

Is it bad to keep hydraulic brakes engaged for many hours?

I find it easier to park my bike if I can remove one of its degrees of freedom, for example, prevent the wheels from rotating. An easy way to do this would be to strap one of the brake levers down. ...
2
votes
4answers
139 views

Can an imperfect hub make a disc rotor rub?

I had a 160mm disc rotor on a road bike that was rubbing a bit in one spot, not severely, but enough for me to notice. I've tried to true it a few times over the past couple months with little ...
1
vote
0answers
27 views

How to release a hydraulic brake (tightened with wheel off) [duplicate]

On my fairly new bike, I had to remove the front wheel on storage. I must have accidentally pressed the brake lever or so, because now the brakes are tight so that the disc won't fit in the brake (see ...
4
votes
0answers
55 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
2answers
114 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 ...
1
vote
1answer
110 views

Using Engine Starter Fluid to Decontaminate Brake Pads

I have some hydraulic disc brakes, and for one reason or another they get contaminated. My dad (who's worked on cars for ages) told me to use engine starter fluid, but I'm kind of skeptical about this....
1
vote
1answer
160 views

How do I increase braking power and “touchiness” of Sram Guide RS Brakes?

I've got some Sram Guide RS disk brakes and they're very weak and not touchy at all. I prefer touchy brakes. I know the Guide RSC has the tool free contact adjustment to make them touchier. I have ...
2
votes
4answers
496 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 ...
4
votes
4answers
144 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
163 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
2answers
315 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
1answer
89 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?
1
vote
0answers
54 views

I accidentally pulled a Shimano Deore brake lever with the rotor and pads off [duplicate]

As the title says, I didn't realize pulling the brake will get it stuck in a closed position when wheel and pads are removed. Now the reason I'm asking this previously asked question is none of the ...
6
votes
1answer
155 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
340 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 ...
3
votes
1answer
186 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
4answers
298 views

How can I reset hydraulic brake pistons without removing the wheel?

I have Shimano M785 hydraulic disc brakes. It is easy to remove the pads and put them back in again even with the disc in place. However, resetting the brake pistons is tricky. I currently use a ...
2
votes
1answer
124 views

What causes “softness” in hydraulic disc brake systems?

I have a simple Shimano hydraulic disc brake system (don't know the model). Over time, the feel of brakes is getting soft, I have tried to adjust by tightening the screw (on the joining of brake line)...
2
votes
1answer
342 views

What can my Shimano BR-M445 caliper be replaced with?

I have a Shimano BR-M445 disc brake caliper that has decided to give up on life, so I need a replacement. It seems like the BR-M445 is no longer produced, so are there other calipers that can replace ...
1
vote
1answer
164 views

Are my disc brake pads contaminated?

My rear brake never locks the rear wheel even with full pull on the lever, especially going down hill or fast. I can even pedal a bit with the brake depressed. This is a recent issue and sometime in ...
4
votes
2answers
443 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 ...
8
votes
7answers
11k 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 ...
0
votes
0answers
51 views

Screaming sounds on my front wheel [duplicate]

Recently I bought a mountain bike with hydraulic disk brakes. But when I ride it the front wheel makes screaming sounds, possibly from the disk brake. I contacted my local dealer and they helped me ...
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 ...
5
votes
3answers
13k 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
2answers
894 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 ...
1
vote
2answers
218 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 ...
0
votes
1answer
183 views

Shimano RT66 Rotors on Tektro Auriga

I'm thinking of changing my original Tektro Polygon rotors to Shimano RT66 rotors. Both use 6 bolts and 160mm size. Is this will be fine with my Tektro Auriga brakes? And will changing the rotors ...
2
votes
1answer
145 views

What can cause disc brakes not to react after keeping/moving the bike upright, then recover?

Recently, I experienced a strange situation with the Tektro hydro disc brakes on my hybrid bike (would the model be helpful here?): I carried it upstairs at a friend's place, and later moved it ...
2
votes
3answers
274 views

What are the securing rings on the disc brake pads pin called?

I've misplaced mine, and noticed the other caliper doesn't have the other one. How important are these? I mean, do pads fail or come loose at times, without these safety feature present? Is it ...
3
votes
1answer
47 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 ...
11
votes
3answers
5k 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 ...
5
votes
1answer
999 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 ...
3
votes
1answer
166 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
676 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 ...
1
vote
1answer
415 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 ...
0
votes
1answer
198 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
1k 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. ...