Questions tagged [brakes]

Disc/rim/drum/coaster brakes; braking technique, maintaining brakes, anything else about stopping a bike.

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7 votes
2 answers
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Replacing worn pads worsens need for bleeding

I am faced with the most peculiar situation. An old XT brake(BR-M785) in some need of bleeding. I remove the worn out pads, observe no significant gunk accumulation, push the ceramic pistons back ...
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2 votes
1 answer
325 views

Why are my BMX brake pads not performing?

This is a ten-year-old Felt "Vault" BMX. I'm old but new to actually building BMX bikes. I bought it used for fifty USD right out of a garage and immediately noticed the slow stopping of ...
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1 vote
0 answers
58 views

How do hydraulic interrupter brake levers work?

It has come to my attention that interrupter-style levers are available for hydraulic brakes now. By interrupter lever, I mean those levers which can be mounted to the same cable on an alternate ...
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13 votes
3 answers
2k views

Are brake calipers directional?

I'm interested in putting a discs brake on the right side of a bicycle. The goal is to have dual front discs, similar to how motorcycles often use double front brake discs. I can buy or make a custom ...
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  • 3,027
5 votes
2 answers
560 views

Do mountain bike cantilever brakes have different pull than road bike cantilever brakes?

I was discussing with a friend who worked at a bike shop for 4 years about switching my mtb flat bars to drops (either a horrendously awful or great idea) and they said I would have to replace my ...
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  • 121
3 votes
2 answers
588 views

Would you be able to use mountain bike/straight bar cable brake levers as auxiliary/inline brake levers on drop bars?

Really dumb question, but would this be possible, with or without practicality? Drill a hole in them, perhaps?
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  • 121
4 votes
1 answer
88 views

How to use the 3rd brake on a tandem?

I found myself looking at tandems today and was surprised to find one with 3 brakes. A bit of further research found that a 3rd brake can be used as a drag brake on steep descents - especially when ...
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1 vote
1 answer
29 views

Brake caliper not springing back all the way

I've got got some road caliper rim brakes which don't spring back all the way after pressing them. They go back 95% of the way but there is a tiny bit of left after that they can travel. (without the ...
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4 votes
3 answers
744 views

Brake post broke off the boss. How do I replace it?

A brake post has been broken off the boss on an old BSO (bike shaped object). I'm exploring my options for reinstalling a brake. There is a hole where the post was, some 6 mm in diameter. I bought an ...
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  • 1,973
2 votes
2 answers
1k views

What are these parts of the frame called?

Intro I am drafting a question about a frame problem, but I'm struggling with terminology. It seems "appropriate for stack-exchange" to start by asking about the terminology first. Main ...
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2 votes
2 answers
103 views

Fat tires, need a front brake

I’ve got Ultradynamico’s Rose (42.??) tires on my Encore 700c Road Wheels (with machined walls) on my Crust Florida Man bike which has a hole for a brake on the fork crown. I’m having trouble finding ...
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1 vote
2 answers
82 views

Mechanical Disk Brake Pads Too Thick

I decided to replace my front brake pads since they are worn out beyond function. So after removing the old pads, I made sure the piston was fully out, and the adjusting screw was fully tight as well, ...
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17 votes
9 answers
4k views

V-brake vs hydraulic disk-brake - which is more environmentally friendly

Let me start the question by saying that I have a pretty good impression of the advantages of disk brakes vs. V-brakes, so I'm not asking about performance comparisons. I'm MTB-ing several thousand ...
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  • 279
9 votes
3 answers
2k views

How do bicycle brake manufacturers balance their products' physical limitations?

This question is valid for both mechanical and hydraulic brake systems. Premises: The human hand has a threshold value for what a comfortable level of squeezing force is, and one cannot comfortably ...
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6 votes
4 answers
2k views

Can I mount disc brakes and 650b wheels on this bike?

I've got an early-mid 2000's Trek touring frame, I think – got it about 6 years ago at a local bike co-op for my first (and only) ground-up build, and had it powder coated, and unfortunately I didn’t ...
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4 votes
3 answers
505 views

Cant undo nut on old brake cable

So today the one of brake wires snapped near the lever, so to repair it I purchased a new wire (as the housing ect. looked fine) and began the replacement. It was all going well, until it came to ...
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  • 137
2 votes
4 answers
159 views

How to remove this stripped brake bolt?

I recently purchased an old road bike and I am trying to restore it. One of the main problem was a rubbish brake installation by the previous owner. I tried to remove the nut and the bolt that hold ...
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1 vote
1 answer
96 views

Restoring vintage road bike - need help with brake choice/compatibility

I'm restoring this old bike that I found on the road side :). I can afford to get this one stolen.. unlike my beloved Trek Checkpoint. First thing is going to be the brakes. These look like side-pull ...
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  • 115
3 votes
2 answers
185 views

Shimano GRX Hydraulic Disc Sub Brake Levers with 105 groupset

The GRX groupsets seem to be compatible with common road groupsets (Tiagra, 105, Ultegra) which was also pointed out in this answer. Furthermore, a brief news article by Shimano states that the brake ...
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  • 151
3 votes
1 answer
84 views

Problem bleeding Shimano XT brakes

I have a problem bleeding Shimano XT brakes: The oil can come down if I open the system at the bottom, and the oil drips down. But once I connect the syringe, put the little plastic cup screws on the ...
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3 votes
1 answer
173 views

Repair Tektro HD-M275 brake lever

My girlfriend's son recently acquired a pre-owned Scott Aspect 760 for Christmas (2021 model) - essentially brand-new and ridden once or twice, if at all. We noticed the other day that something ...
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1 vote
0 answers
66 views

Magura mt5- non stop micro bubbles coming out while bleeding

I have a problem bleeding my Magura MT5 brakes. I used two 50-ml syringes and the EZ MTB bleed kit. I pushed fluid from the syringe attached to the caliper to the top (at the lever) and back again. I ...
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4 votes
1 answer
137 views

How to lower a road bike caliper

I have a beautiful titanium frame made by Van Nicholas. Unfortunately it uses long reach rim brake calipers front and rear (branded Van Nicholas, but I would say tektro made). They are pretty ugly and ...
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4 votes
1 answer
233 views

Brake pads keep getting contaminated - how to diagnose?

My bike uses Shimano hydraulic disc brakes. I can't find any markings on the calipers or handles, but the manufacturer's website says they're BR-M315. Over the past few months I've had issues with the ...
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  • 353
5 votes
1 answer
219 views

Brake cable reach

On my 2016 Giant Defy with Shimano 105 shifters I am finding it very difficult to reduce the reach on my brake levers and they need pulling almost to the handlebar to brake. Is it possible to reduce ...
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  • 53
4 votes
1 answer
129 views

105 11-speed Crankset & Brake Caliper Compatibility w/ 2400 Claris Groupset

I have a 2016 Bianchi Via Nirone 7 with a 2400 2x8 Claris groupset. A buddy of mine is "upgrading" in stages and is letting go of his 105 components at a VERY reasonable price. Great timing ...
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1 vote
0 answers
86 views

when bike kept inside, brake/ lever goes extremely stiff

so, I've been through a lot of fiddling with my brake levers, giving them a small clean out and bleed, but I've noticed now that when i keep my bike inside (on heated floor) the brake levers go stiff, ...
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12 votes
1 answer
889 views

How do I rebuild Shimano XTR brake levers?

My right brake lever (Shimano BL-M9020 to be specific) has attracted some dirt around the blade pivot area, and some parts look shiny. I suspect the master piston seals are starting to leak. Replacing ...
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  • 10.5k
3 votes
6 answers
914 views

Adjust brakes to avoid deflating tire for removal

Is there a way to adjust the front brakes on my Specialized bicycle so I don't have to deflate the tire to remove it? The bike has a side-pull brake with a lever that provides extra space between the ...
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  • 173
3 votes
1 answer
222 views

Cantilever brake is missing its mounting screws and washers, how do I replace them?

Context I am fixing up a BSO where the rear cantilever brake is missing. I want to keep this project green and cheap, and there is a good supply of used cantilever brakes online. But they often come ...
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  • 1,973
3 votes
3 answers
193 views

Warped rotor due to overheating only on "expensive" brakes?

I got a new bike (Scott Egeniues 920) and after a few rides the rear rotor bent/warped due to long downhill riding (I often go down more than 1400m/4200 feet in one go). When the rotor cooled down, it ...
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8 votes
3 answers
2k views

Removing wd40 from disk brakes

I sprayed WD40 on my disk rotor and now my rotor and pads are contaminated and now my rear brakes are practically useless.Is there any way to fix the problem without swapping out the brake pads and ...
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  • 221
0 votes
2 answers
122 views

Is it worth switching from V brakes to disc brakes? [duplicate]

The bike that I am getting has v brakes and I was wondering if it would be worth the money to get disc brakes for it. Can someone please help me here?
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  • 45
2 votes
1 answer
165 views

Why do my side pull caliper brakes work better with linear pull levers

I have an older Windsor bike that came with some long arm side pull caliper brakes. I was using it with a pair of avid fr-5 brake levers that are stated on the specs as "Compatible - All levers ...
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  • 155
2 votes
2 answers
82 views

Avid Jucy 3 Piston Removal (seized)

I have a set of Avid Juicy 3 calipers that I have sucessfully replaced the pistons and seals on. Getting the pistons out of one of the calipers was not so easy though, and I ended up drilling the ...
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  • 8,715
0 votes
0 answers
47 views

managed to take lever apart, other then the pistons, because of retaining plastic piece

I have managed to take lever apart, other then the pistons, because of a retaining plastic piece, this would be removable, but is held onto the external part of the lever by a small needle sized ...
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2 votes
1 answer
106 views

How to create resistance in brake lever for v Brake

When I depress my front brake lever it just goes all the way to the handle bars offering no resistance and the brake pads apply little pressure to the rims Why is this and how do I fix my vbrake. ?
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1 vote
2 answers
105 views

PROMAX DECIPHER hydraulic brake hose replacement

I have a set of PROMAX Decipher hydraulic brakes and need to replace the hose cable (basically adapt these brakes to another bike and the cables length is longer). I would like to know how to split ...
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18 votes
2 answers
5k views

On a long smooth descent, do brakes really heat less with intermittent hard braking compared to dragging?

It is my impression (both from experience and from online opinions) that braking on a mountain bike is to be done in intermittent hard engagement of one or both brakes. The reasoning being that ...
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  • 12.7k
1 vote
1 answer
121 views

V-Brakes squeal very loud when braking

I've been having this issue for about 3 months. The front V-Brakes squeal extremely loud when i fully engage them. This problem randomly started one day when i took my bike for a ride. At first it ...
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2 votes
2 answers
84 views

failed brake bleed, lever is blocked up

My brakes are Shimano Saint. I tried bleeding my brake to identify a problem and no fluid went through. I took the brake lever off separately and pushed water through it, still blocked so I gathered ...
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2 votes
4 answers
203 views

How to increase brake responsiveness on Microshift style STI brifters paired with mechanical disc brake

I have a set of microshift style STI brifters. They are paired to a generic brand mechanical brake set on a Kent Nazz gravel bike. I can't seem to get the brakes to be as responsive as I would like. ...
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  • 155
0 votes
2 answers
67 views

Disc rotor rubbing against pad when bike is tilted

There is a fair amount of lateral movement of the rotor between the pads in the rear wheel break calipers. I have played about trying to centre the rotor as best as I can to stop the ching noise ...
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1 vote
0 answers
109 views

Disk brake issues

I’m new to disc brakes and noticed my braking power decreasing. Took the pads off and they look like this. Do these lines indicate anything? What is a used disc brake pad supposed to look like? What’s ...
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1 vote
1 answer
195 views

Brake lever suddenly lost its extra movement (extremely stiff). before the pads contact the Disk

a month back i had a crash where the brake lever got a clump of sand on it, so i washed it out with water and didn't have any problems, then one random day when i took my bike out for a ride i noticed ...
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2 votes
2 answers
90 views

Fixed piston on promax render r caliper doesn't adjust up or down

I have a bike setup with Promax Render R disc brake calipers. They use mechanical action to brake (no fluid). There's an active piston that's actuated by the brake lever, and a fixed piston that sits ...
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  • 271
0 votes
1 answer
108 views

What is the Mechanical advantage provided by mechanical disc brake caliper

I'm designing a tricycle and I wish to put mechanical disc brake calipers but I only got leverage of brake lever, I'm also searching mechanical advantage/leverage provided by mechanical brake caliper ...
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2 votes
1 answer
205 views

My Hydraulic Brakes Always Need To Be Pumped/Burped Before Braking Sharply

So my mechanic and I bled my brakes after it always needing to be pumped before it brakes, brake fluid came out black and seemed to have metal shavings at the bottom. The only problem now is weirdly ...
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  • 21
4 votes
1 answer
163 views

Readjusting brakes after every wheel removal?

Today I had a puncture and had to remove the back wheel of my bike (the wheel has a quick release skewer). After re-inserting the wheel, the rim is grinding at one side of the brake (the brake is a &...
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13 votes
3 answers
5k views

Brakes not stopping my bike

I am new to cycling. I just brought a new single speed fixie, Takara Sugiyama. It's for commuting (commute include hills). When I went down a hill, the rim brakes couldn't stop the bike at all. It was ...
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