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0answers
24 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 ...
4
votes
4answers
127 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 ...
3
votes
2answers
83 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
45 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
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0answers
48 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 ...
5
votes
1answer
105 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 ...
4
votes
2answers
188 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 ...
2
votes
1answer
103 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 ...
4
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2answers
225 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 ...
0
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0answers
49 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 ...
3
votes
1answer
102 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
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4answers
217 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
181 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 ...
0
votes
1answer
125 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
142 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
2answers
92 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 ...
2
votes
3answers
136 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 ...
1
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1answer
139 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 ...
3
votes
1answer
39 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 ...
5
votes
1answer
509 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
155 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 ...
1
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2answers
3k 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 ...
5
votes
1answer
205 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 ...
1
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2answers
187 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
265 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 ...
2
votes
4answers
372 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 ...
2
votes
1answer
149 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 ...
0
votes
1answer
189 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 ...
0
votes
2answers
557 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 ...
0
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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 ...
2
votes
1answer
275 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?
4
votes
3answers
8k 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
1answer
1k 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 ...
5
votes
2answers
196 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. ...
11
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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 ...
0
votes
1answer
817 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
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2answers
558 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 ...
5
votes
1answer
222 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 ...
1
vote
2answers
3k 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?
5
votes
2answers
5k 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 ...
1
vote
1answer
710 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 ...
5
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2answers
1k 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 ...
0
votes
1answer
5k 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 ...
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3answers
707 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
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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 ...
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 ...
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 ...
2
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5answers
966 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. ...
3
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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, ...
3
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2answers
1k 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. ...