All Questions
Tagged with brakes hydraulic-disc-brake
132
questions
4
votes
3
answers
844
views
Replacing hydraulic brake lever
This is my first time dealing with hydraulic brakes.
The front brake on my bike is Shimano BL-M4100 lever with MT410 caliper. I stripped the lever's clamp thread and going to replace the lever with a ...
- 143
2
votes
2
answers
269
views
Shimano BR-MT400 caliper upgrade?
After 2 years calipers no longer retract fully (pistons) causing annoying rubbing sound.
What options do I have to upgrade it (perhaps something more durable) providing I still want to reuse the same ...
- 65
0
votes
1
answer
381
views
Tektro HD-M275 rear brake making grinding noises while braking
I got Tektro HD-M275 hydraulic disc brakes with 180mm rotors, front brake is working perfectly with no issues. Under light braking rear brake works normally without any noises or vibrations, but as ...
6
votes
3
answers
535
views
What are the failure modes of the brake rotor worn beyond limit
Background
I have been maintaining two bikes for a few years. Both have disk brakes. One has around 10 000 km on it another one is well over 35 000 km. The disks on the bike with 35k+ are now reaching ...
- 2,857
3
votes
6
answers
980
views
When does the braking power stop scaling with Rotor Size
It's commonly established that the braking power scales with rotor size, and an optimal braking technique is to provide enough force for the rear wheel just to lift up. However, my question is wouldn'...
- 33
1
vote
2
answers
500
views
What to considering when replacing disc brake calipers?
I currently have an endurance road bike equipped with Shimano 105 hydraulic disc brake calipers. Since I am transforming it into a gravel bike, I would like to change the calipers to the Shimano GRX ...
- 302
0
votes
2
answers
507
views
Mountain bike brake pistons not compressing when brake is pulled
I have a Shimano BR-MT201 Hydraulic Disc Brake on my rear brake. I was replacing the brake pads and accidentally pressed the brake too many times and the piston popped out leaking brake fluid. ...
0
votes
1
answer
613
views
What are the exact dimensions of Shimano disc brake split (cotter) pins?
What are the exact dimensions of Shimano disc brake split (cotter) pins, such as part nr. 25 (Y8DB06100) on BR-MT410 caliper (https://si.shimano.com/en/ev/BR-MT410-4663)?
Looking to buy generic ...
- 405
1
vote
1
answer
532
views
Scratched hydraulic brake hose during install - should I be concerned?
today I was installing brand new GRX brakes into new frame. It was not my first time, I've already build 10+ bikes, I messed up through. I inserted rear brake hose without any issues, I had my guide, ...
- 31
8
votes
2
answers
711
views
Is degassing DOT brake fluid before a bleed still a thing?
I recently bled old AVID Juicy 3 hydraulic brakes and followed the procedure described in this AVID Bleed Procedure video (starts at the relevant section). While preparing the syringes, the technician ...
- 4,159
-1
votes
1
answer
98
views
Mechanical bike disc brake caliper lever
Where can I find a data sheet for this part? I want to know if there is a magnification factor between the force which acts on the disc brake by pads, and the force that I pull the wire with, as I ...
2
votes
1
answer
769
views
How do I replace one oil with another in a Shimano brake system?
Having seen this question about correcting the "wandering bite point" problem common with Shimano brake systems, I intend to replace the standard Shimano mineral oil in my brakes with the ...
- 4,021
9
votes
7
answers
1k
views
On road repair for hydraulic brakes
What are the possible on-road modes of failure for hydraulic bicycle braking systems, and what can a touring cyclist do to be prepared for their eventuality? What can one carry as an emergency backup ...
- 2,696
2
votes
1
answer
127
views
Oil stopper of Shimano oil funnel: what's its sharp end for?
Shimano instructs to insert the sharp end of the "oil stopper" to bleed the brakes:
What is this for? I would expect that the oil should just flow from/to the funnel when pumped into the ...
- 1,635
3
votes
2
answers
122
views
How to tell what service my MTB front hydraulic brakes need?
The front Shimano SLX (m7120) hydraulic disc brakes on my trail bikes have lost their mojo. It still brakes but less aggressively than a year ago. Possible causes are worn pads and air bubbles in the ...
- 181
3
votes
1
answer
401
views
Magura brake pad change: friction noise?
After replacing my worn-out Magura brake pads (MT4 brakes, 7P brake pads), I now have a continous light friction noise when the wheel is spinning (front wheel).
The brake disc is brand new as well. ...
- 63
6
votes
4
answers
3k
views
Mechanic told me to replace the entire brake system because of "slow return"?
A bit of back story first: I bought a second-hand bike in 2020. It has SRAM Level TL installed from the start. It caught my attention that brake lever didn't return to the end and had very little ...
- 942
3
votes
2
answers
1k
views
Immense difficulties bleeding a shigura setup
I set up a shigura system with BL-M8000 levers, MT5 and MT4 Callipers and Magura hoses and shimano parts on the lever end. But I couldn't get even a decent bleed on them. I tried a couple of ...
- 203
4
votes
1
answer
199
views
Can an out of alignment brake caliper lead to the piston falling out?
The hydraulic brake caliper on my bike is slightly out of alignment. It's not fully rubbing, it more or less looks like the slight rub picture here - https://www.parktool.com/en-int/blog/repair-help/...
- 295
5
votes
2
answers
431
views
Brake or Wheel Click under braking
I have a clicking from my rear wheel (sometimes in the front too), when applying my brakes. Sounds similar to a aluminum can tab being snapped, or can being flexed.
Product
Brand
Model
Caliper
...
- 51
3
votes
2
answers
476
views
Why aren't mechanical disk brakes self-adjusting?
Hydraulic disk brakes usually adjust for pad wear via special seals that allow the pad to "creep" closer to the brake disk as they wear down. It seems that such seals could equally well be ...
- 249
2
votes
0
answers
284
views
after multiple brake bleed, lever's max stiffness is still close to bar
so after a few bleeds i've done on these Shimano saints, because of new levers replacement, i've found that the rear brake lever, although on max stiffness, goes way further to the bar then the other ...
- 185
8
votes
1
answer
620
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 ...
- 3,456
17
votes
9
answers
5k
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 ...
- 287
3
votes
1
answer
430
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 ...
- 606
5
votes
1
answer
4k
views
Brake pads keep getting contaminated - how to diagnose?
(see updates at the bottom)
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 ...
- 563
12
votes
1
answer
5k
views
How do I rebuild Shimano XTR hydraulic 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 ...
- 16.4k
2
votes
2
answers
511
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 ...
- 14.6k
2
votes
2
answers
2k
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 ...
- 185
1
vote
1
answer
3k
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 ...
- 185
2
votes
1
answer
5k
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 ...
- 21
0
votes
0
answers
87
views
Initial resistance / detent feeling in hydraulic brake
My brake has a up-front amount of pressure it needs before it will then engage. It feels like I'm actuating a clicky button and not a continuously moving brake. What could be causing this?
- 101
0
votes
2
answers
1k
views
Is it normal for a rotor to move when brakes applied (hydraulic)?
I noticed a movement of braking disc when pressing rear brake and watching on rotor. It was moving about half millimeter. Is it normal for rotor to move minimally?
- 1
6
votes
1
answer
7k
views
Why is my hydraulic front disc brake clicking?
I noticed that there's a mysterious click that seems to be tied to wheel rotation when riding my bike. It is barely audible when there's no traffic nearby. I initially assumed that it's a hub or the ...
- 20.1k
7
votes
2
answers
559
views
Are clear hydraulic brake lines available for sale?
Since all brake lines are not see through, the only way to determine if your brake needs a bleed is by feeling the brakes. If they are "squishy", then you need a brake bleed.
I'm of the ...
- 1,077
5
votes
2
answers
918
views
Can't bed in my hydraulic brake pads
I washed my bike with Rhino Goo fast action cleaner and fairy liquid in a spray bottle mixed with water. I used a hose pump with no pressure, so no liquid will go into my bearings etc. After I washed ...
user53999
6
votes
2
answers
2k
views
Is the banjo bolt the same between the Shimano XTR and Shimano Saint rear brake caliper?
Earlier today, I went to install a brand new Shimano Saint caliper in place of an old XTR that's leaking from the pistons, only to find that Shimano doesn't include the banjo bolt...
Do the XTR and ...
- 1,077
2
votes
2
answers
2k
views
Are there downsides to cross-top brake levers? Compatible with all mechanical-hydraulic disc brakes?
I have a Genesis Croix de Fer 20 from a few years ago with the following specs:
Brakes: TRP HY-RD mechanical-hydraulic caliper w/160mm TR160 rotors
Levers: Shimano Tiagra ST-4700
I would like to fit ...
- 1,585
2
votes
3
answers
3k
views
Hydraulic brake bleed fail - try again or replace?
I bled and completely replaced the fluid on a set of Tektro Orion hydraulic brakes, using Shimano mineral oil. Before bleeding, one worked a little bit, and the other didn't at all. In my impression,...
- 121
5
votes
1
answer
3k
views
Magura rim caliper and Shimano hydraulic road lever compatibility
I have a trekking bike with a slightly short reach for me. On the other hand I wish to get a drop bar bicycle. I could check on this bike that the position is good with drop bars.
On this bike I have ...
- 734
3
votes
1
answer
2k
views
Rear brake doesn’t grip/slips through and doesn’t stop the bike sharp or at all
I cleaned my bike about a month ago and since then I tried to fix both of my brakes.
I have hydraulic disk brakes (Tektro Auriga). After I replaced my pads, I was bedding them for over three days of ...
user53999
0
votes
2
answers
515
views
How to fix contaminated brake pads? [duplicate]
I recently spilled some brake oil on my brake pads and now they barely work, and they squeak (which I believe is normal for contaminated pads.)
- 11
0
votes
3
answers
767
views
Will 180mm rotors fit my Carrera Vengeance Ltd. Edition bike?
So I would like to get Clarks M3 hydraulic disc brake set but the only size available is 180mm but i am not sure what to measure to see if this will fit my carrera vengeance ltd edition 16 inch frame ...
2
votes
5
answers
4k
views
What are the typical range of maximum braking friction forces?
There are many non-bike applications which benefit from using bicycle hardware. Case in point, there is a long and rich tradition of using bike parts in aviation. One particular area of interest is ...
- 136
3
votes
1
answer
566
views
new Clarks m2 hydraulic disc brakes won't retract when brake lever pressed
I just fitted a new set of Clarks M2 hydraulic disc brakes.
I aligned the calliper to make sure the rotor doesn't rub the pads when the wheel is spinning.
I then pressed the brake lever, when letting ...
- 31
5
votes
1
answer
742
views
Should I replace my disk brake calipers?
I have a pair of Shimano Deore BR-M615s on my mountain bike with about 3,000 miles and 5 years on them. Lately I've noticed that both brakes have too long of "pull" before providing braking. ...
- 265
7
votes
3
answers
9k
views
Hydraulic brake lever doesn't return after being released, dependent on weather
I have a pair of second-hand Shimano ST-RS685 hydraulic brake levers / shifters. Unbeknownst to me they hadn't been used for a year and had quite a bit of dirt / grit inside, which I've cleaned to a ...
0
votes
1
answer
2k
views
How to adjust brake level movement on hydraulic brake?
My bicycle has Tektro Auriga hydraulic disc brakes. I can adjust how far the level stitches out with a small screw (see here, figure c2).
I was wondering if it is possible to adjust how much the ...
- 141
0
votes
0
answers
42
views
I require advice on a recurring problem with my brakes
I've had a bike with hydraulic brakes for about six months now, and have a problem with the brake just losing power. I think it's fluid being lost.
This is a question I asked earlier
Something wrong ...
- 53
2
votes
1
answer
4k
views
I would like to upgrade my Shimano disc rotors from 160mm to 203mm. How to pick the right rotors?
My bicycle came with the BR-MT200 (https://www.bike-discount.de/en/buy/shimano-br-mt200-disc-brake-set-721603) brake set: hydraulic levers, 160mm rotors.
I'd like to upgrade to 203mm, but I don't ...
- 145