The best way to bleed a Shimano disc brake
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- เผยแพร่เมื่อ 21 ต.ค. 2024
- This bleed procedure can be used on a variety of brakes with just a few tweaks like using the correct syringes and oil.
From experience the general method of pushing the fluid up and and back multiple times has proved to be the most consistent way of getting a good bleed on most brands of brakes, try it yourself and let me know how it went.
You will need:
Shimano mineral oil
Shimano bleed bucket
Shimano bleed syringe
The correct Shimano bleed block for your brakes
7mm spanner
Plastic tyre lever
Pliers
Allen keys
Paper towel
Brake cleaner or isopropyl alcohol
Thank you for the excellent presentation about bleeding hydraulic bicycle brakes.
Glad it helps!
While this is Shimano's official bleed procedure, for the life of me I don't understand pushing all that dirty fluid into the relatively clean lever. The dirty fluid is isolated at the caliper where the heat is generated as well as the pistons and seals being subjected to filth, so it makes so much more sense to do a gravity fluid flush first to get all of that dirty fluid out at the caliper and once that's done, begin pushing up. This isn't a knock on you, but rather a knock on Shimano.
There are better ways of doing a bleed and flush. Pushing dirty fluid up into the levers is not a good technique, hence your fluid still seemed to be dirty at the end. Again, every person has different pov, this is how I've been taught to do.
Thanks for this, it's an excellent video. I'm a newbie at disc brake maintenance. It seems like it would be fairly simple to bleed air out of such a little system, but I'm amazed at how much fiddling around it takes to get all the air out. I've bought a used bike that I think needs it, but it would be my first attempt. I'm sure your method works, but as a point of discussion, pumping the fluid back and forth kind of confuses me. Doesn't the air always move more easily upwards? Is the air still moving up into the open funnel while you pump the lever to move the fluid down to the caliper or are you pushing air out the top and bottom? If you're pushing air into closed syringe at the bottom caliper, it seems to me the air has nowhere to go? Or you keep the syringe angled upward so the bubbles stay near the plunger and not go back into the line?
All of the processes are really just about trying to agitate the fluid so any air that has been trapped in the various parts of the system can be moved. You’ll see air come out of either end as you move the fluid.
Yes, you want to keep the syringe upright at all times so any air that you do get out stays out of the way and doesn’t get pushed back into the system.
You shouldn't have any discoloured oil in the syringe or the bucket at the end of the bleed 🤔
Why would you do all this vs just a gravity bleed? Puck bucket of clean fluid up top, drain from bleed port until the fluid runs clean, close bleed port, squeeze out any bubbles if any, insert plunger remove the oil bucket, reinsert lever screw and done. I don't get what benefit there is to pushing vs gravity draining.
Both ways work to be fair, gravity bleeding generally takes longer and air wants to rise so pushing the fluid up and down lots of times tends to agitate any air that has got itself trapped in the system in which may not be moved by just gravity bleeding.
It's amazing to me that your voice is so quiet I have the volume all the way up on my phone no other background noise and it's very hard to hear you and I know it's not my hearing. And the other gentleman who uses an empty spray bottle as a nice clear voice for gosh sakes speak up and we can't hear you if you're turned away from the microphone when you speak
Good value for the money
There so many video out there showing us how easy it is to bleed brakes. In my experience never again I will touch the brakes ever again. It’s not worth getting hurt on the trails. My brakes failed on me nearly had a death experienced. In my opinion let the pro Handel this kind of stuff. The benefits of doing Doing it yourself is that you save a little bit of money. I think hospital bills and medicine cost more.
Only you can decide whether you are capable of performing a task or not. For many, many people who wrench on their bikes, brake bleed is really not that big of a deal and I don't think we're risking life and limb doing it.
Tell me you work in a bike shop, without telling me.
Fluid still doesn’t look clean.
Super
Nice video thanks for sharing this fully suspported to you bro
You said it was the best way but you are doing too much😂🤣😅🏴🇬🇧🇺🇸🇨🇦🇪🇺💯
Disagree. Gravity bleed is the best way. This is the inferior way. More complex. Filthy fluid through the lines going up. Air bubbles possible in the system. Just not a good and dated method. Gravity bleed. All day long.
The dialogue is a complete afterthought, IMHO.
It look like ran out of CO2 coca cola
Nice tutorial but such a phaff! I’ll stick to cable breaks.
Hydraulic brake are far superior to cable drawn brakes in every way (except for trailside repairs).
I did it for the first time since I bought my bike 11 years ago...I took me about 15 minutes for the first line, but only about 2-3 minutes for the rear as I now knew what I was doing. It really doesn't need to be done all that often.
Nothing will tire me out more that grabbing onto mechanical brakes on a technical downhill for 1-3 hours. However, YMWV. I guess it depends on how/where you ride.
Hydraulic brakes are way better once you ride them and caring for them is nowhere near as difficult as this video makes it appear. Search Gravity bleed. If it's good enough for the top downhill mechanics, I think it's good enough for me.