How To Bleed A Shimano Hydraulic Disc Brake

Рет қаралды 81,988

Күн бұрын

Join Owen as he shows you how to bleed most of the Shimano mineral oil brake systems. Using Shimano's Bleed kit bleeding your Shimano brakes has never been easier. Using a funnel and syringe it's easy to see bubbles and the colour of the fluid change. Using Owens tricks your brake system will be free of air and feeling firmer than ever!
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⏱️ Timestamps ⏱️
0:00 - Intro
1:10 - What tools you need to bleed Shimano brakes
2:18 - How to bleed Shimano brakes
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Пікірлер: 69

@gmbntech 3 ай бұрын

Are you using hydraulic brakes yet or are you still on good old-fashioned cables? Let us know in the comments below! 👇

@LaurentiusTriarius 3 ай бұрын

On one of my road bike yes, I wish there was an inexpensive cable actuated hydraulic system for MTBs...

@simonm1447 3 ай бұрын

On some simpler bikes and on classic mountainbikes - rim brakes. On the more modern bikes, the modern mountainbike and on the commuter - hydraulic disc brakes I have one GT Avalanche 3 with mechanical disc brakes, I kept them (Tektro IO) since they were original on this semi classic mtb but they do not nearly have the performance of a hydraulic disc brake

@Alex-ph4iu 3 ай бұрын

I've been using mt200 for 7 years now, bled them 4-5 times during this period, but for the last 3 years i feel a big loss of power in rear brake (pads are new, rotor clean, oil is new too). Maybe it's time to change brake lever? I even thought about returning to cable type brake...

@simonm1447 3 ай бұрын

@@Alex-ph4iuOver time the 200s can get play in the lever bolt too. However in EU you get a full set for one axle for 25 € and a caliper for under 10 €

@GenePavlovsky Ай бұрын

@@Alex-ph4iu Usually you can rebuild the master cylinder (the hydraulic device inside the brake lever) by replacing the seals or the entire plunger assembly. Provided that you can find the spare parts (lever rebuild kit). There's also a possibility that the caliper pistons are not moving freely due to corrosion. Caliper rebuild kits (piston+seals or just the seals) are also available. The above is based on my experience working with cars and motorbikes. On a bicycle you have an advantage of easily being able to upgrade your brakes by replacing them with a newer and better model.

@ThunderStruckMTB 3 ай бұрын

I'm just gonna be that guy.... 1) Before pushing the caliper pistons back into their bores you need to open the lever and install the bleed cup so that the fluid has somewhere to go, otherwise you risk tearing the delicate diaphragm in the lever and fluid WILL squirt out from the lever vent port. Shimano has updated their latest dealer manuals to say exactly this. 2) Why push all of the filthy fluid from the caliper to the lever? Do a quick gravity bleed/fluid replacement to get that filthy fluid out of the caliper first before doing any bleeding from the bottom up.

@a8f235 3 ай бұрын

Yeah, I did find this video a bit rough around the edges. The other thing is to clean the pistons before pushing them in as well.

@woduk 3 ай бұрын

surprised people don’t already do that. Even on my hope brakes you take the rubber diaphragm off and the reservoir top cap.

@nathanroberts4935 9 күн бұрын

Hmm so you have to waste new oil to put in the container only to contaminate it with old oil? Seems a waste

@alaindelon5398 Күн бұрын

I would flush out from the top down all with air all of the old oil, then start fresh from the bottom with new one till no more bubbles, whatever is left at the top should be pretty much good to use next time or be dumped. Not that expensive.

@muppet400 3 ай бұрын

@gmbntech. Thanks for this great vid. It’s about the only one I’ve seen that tells you to adjust the reach and bite point first. Was never sure before. Great content as always.

@lewisjacksonv Ай бұрын

What a great tutorial! Easy to follow and understand. Asset to gmbn!

@dannyk3718 3 ай бұрын

great explanation and walk through thanks

@flyingdumbo76 3 ай бұрын

you are the best guys

@tsops22 3 ай бұрын

I find tapping the hoses a bit at the end to get rid of any cheeky final bubbles helps also. Great vid, thanks as always for all your efforts!

@FOTB407 3 ай бұрын

Disconnecting the calipers from their mounts and letting them hang down vertically is best ime (particularly the rear, front is already vertical when mounted). Have a stool or something for caliper to sit on

@buffalobilly6046 Ай бұрын

Nope and nope. Old wives tales. Same for disconnecting calipers. I’ve done this a dozen times it takes me five minutes I don’t disconnect anything and my brakes work perfectly every time.

@kevinwmitchell5773 3 ай бұрын

I appreciate all the helpful content you folks provide but I have to say this how to isn't one of your best. Most notably, you provide no comment or instruction on bleeding the syringe hose of air before attaching to the caliper. Around 5:23 you can see the hose attached, with an air void in the hose and the hose oriented in a vertical direction. Once you start injecting mineral oil into the caliper, this air is going to be pushed in first. Yes on a front caliper you probably will push this air all the way through to the collection cup. But on rear calipers where the hose routing sometimes has a number of bends, you are potentially adding air into the system that could be a bitch to bleed out. Also, after closing the bleed port on the caliper, almost all Shimano brake bleed instructions advise cycling the brake lever repeatedly, until no more bubbles exit into the bleed cup. You don't cover this.

@hifiandmtb 3 ай бұрын

Agree. And when the pads are put back on there no mention of cycling the lever to get the pads to the correct bite point. Or rechecking pad rub on the disc. You always need to muck about a bit with caliper positioning as the pistons rarely work perfectly symmetrically.

@pontap90 3 ай бұрын

If you follow the steps but can't push oil through, it can be that you need to screw the lever adjustment back a bit again. I just encountered this issue.

@kurtismckemmie4850 Ай бұрын

The brake bleed kit I bought from dyisland the instructions say to screw the pin in to close the line before adding fluid. I was very curious about the pin next to the lever as I had a mess of mineral oil all over the cables.

@JoelZieve 3 ай бұрын

Why not do a gravity bleed?

@eliascly2366 2 ай бұрын

Cheers!

@199724 6 күн бұрын

My bleed nipples just leak all the fluid out when I brake after bleeding. Exact same issue in both front and rear. Very frustrating. Yes of course I tightened the nut again.

@Themilkmanskid. Ай бұрын

Seen other vids where they push fluid from bottom to top to clean the line, then draw in fresh fluid from the funnel at the top.🤷 I like this vid better and will try this way.

@BeniKenesei 3 ай бұрын

Like others said, if you press the pistons back with the bleed screw still installed in the lever, you have a pretty big chance of wrecking your shimano levers. For older shimanos and other brakes it's usually not an issue. Just install the funnel with or without oil on the lever as the first step!

@BeyReaper 3 ай бұрын

Is the process the same for Sram? Actually Magura, bc thats whats on the bike I just bought. If they're not the same can you make a video on that or can someone link a good video on it?

@andyrogers747 3 ай бұрын

“…but the brake fluid” - lmao 👏

@MrDstnyw 3 ай бұрын

I use green citroen lhm mineral oil works fine bet there are a ton of reasons why i probly shouldnt

@simonm1447 3 ай бұрын

At least it's still mineral oil. What is important not to use Dot fluid in mineral oil brakes or the other way, since the rubber of the O rings is made to withstand Dot or mineral oil, but these are different sorts of rubber

@MrDstnyw 3 ай бұрын

@@simonm1447 exatly what i thaught, lhm is way cheap but still good quality so inclined to bleed more regular the viscostity seems very similar performance wise highly recomed it genuine total lhm+

@LaurentiusTriarius 3 ай бұрын

On pretty much all the dirtbikes I had the fluid is not that nasty when I bleed them mid or off season (about every 6 months) but when I had Shimano brakes I bled them like every 2-3 months and the fluid was ALWAYS nasty, like brown/black. Why is that?

@rolandegyed6695 3 ай бұрын

A question, maybe a dumb one (I recently upgraded from v-brakes to hydros, so I don't know everything yet): why do you need to pour mineral oil into the syphon on top? Isn't that just for collecting the old oil?

@robertbransby 3 ай бұрын

Sometimes the syringe can drag a little back when you open the bleed nipple, saves dragging air into the system from the top

@simonm1447 3 ай бұрын

I used the old mineral oil the last time to clean chains. If you put it into a plastic bottle with a big lid you can put the chain in and shake it (don't do it with glass bottles since they can break - don't ask why I know this). The oil cleans the chain and lubricates it at the same time. After some time the dirt settles on the ground of the bottle and the oil can be used to clean more chains

@LowFrequencyJim Ай бұрын

I though you were supposed to pull the old fluid out from the caliper side as contaminated fluid can ruin the levers?

@gmbntech Ай бұрын

Shimano's have always bled this way, dirty fluid will get purged at the top so you don't have to disconnect and refill a syringe with clean fluid.

@alaindelon5398 Күн бұрын

Thank you sir.

@ChrisRufus76 3 ай бұрын

Where is the video for Tekro Hydraulic Brakes, the most common brake on budget bikes sold?

@tomekborucki1120 3 ай бұрын

The most common ones are shimano mt200.

@SCRAPSTrash 3 ай бұрын

@gmbntech Air in the syringe when it's filed with oil. Is this an issue? Or will the air in the syringe cycle through the system with out worry of trapping air inside the brakes?

@mattgies 3 ай бұрын

Just stop pushing on the syringe before the air gets to the tip. Easy enough if you keep the syringe vertical.

@antc5010 3 ай бұрын

Keep the syringe vertical with the plunger at the top and the outlet hose at the bottom.

@GenePavlovsky Ай бұрын

@@antc5010 Or you can get rid of the air in the syringe/hose during filling it, and not run the risk of introducing an unnecessary bubble into the system.

@plainuser48596 3 ай бұрын

Any reason why this is better or more preferable than gravity bleed?

@aftondanforth7387 3 ай бұрын

bc air goes up but it sometimes helps to do a gravity bleed first, then push new fluid up and do a lever bleed.

@stokedonearth5097 Ай бұрын

just pour your old oil into the ocean. the sea animals love it.

@mano8033 3 ай бұрын

Let's do a TRP after this one

@2sweetpaul 3 ай бұрын

Baby oil 😂

@johndef5075 3 ай бұрын

Can I use an old rotor as a pad spreader?

@simonm1447 3 ай бұрын

yes, of course

@spikeymike267 3 ай бұрын

Marshy gravity bleed every time

@minethegap 2 ай бұрын

Why would you pour fresh mineral oil into the reservoir and contaminate it with the flush from the bottom up. This video has a few fundamental errors that need revised. You can’t force pistons back if the reservoir is shut. The o rings on The piston will fail. Great video but do it again. This technique really only eradicates air bubbles not contaminants and moisture.

@satchmotionrc8202 3 ай бұрын

Should make a video how to bleed mechanical disc brakes 😉

@s_university_blvd Ай бұрын

fuckingham palace

@kona0197 3 ай бұрын

What is with GMBN always mispronouncing the word "Lever" ?

@adrianrogers6976 Ай бұрын

Because we are English and pronounce it the correct way

@John3-16Clothing 3 ай бұрын

First

@gmbntech 3 ай бұрын

🥇

@mattgies 3 ай бұрын

You've contributed nothing and patted yourself on the back for it. Great work!

@dominiqued.2307 Ай бұрын

This is a really bad instruction video. At 5:25 they don't show properly how to connect the syringe. This other GMBN video explains it way better and in real time, they don't skip the difficult steps: kzfaq.info/get/bejne/fs2XiZhzq7q2p2w.htmlsi=gjCSM4lpcno18QJX They explain way better how to connect the syringe and avoid air bubbles in the other GMBN video.

@RoyalKyleBarker 3 ай бұрын

So much of this is wrong / not recommended. These clowns are getting view-hungry in my opinion.

@AA-dp1iy Ай бұрын

Please don't read it, it's that simple

@MrSupermugen 3 ай бұрын

How many times is this channel going to rinse and repeat videos? every new tech host has done it.... GMBN is such crap now

@ArkUSAbikerchick 3 ай бұрын

I thought this one was a little more detailed and each step had close up pictures. A little easier for me since I have not done this before, but I feel like I can do it now. And the brakes look to be the same model as mine too! I thought it was improved! 👍

@MrSupermugen 3 ай бұрын

@@ArkUSAbikerchick pick any of the previous 10 videos.

@Justin-ny6un 3 ай бұрын

@@ArkUSAbikerchickIt’s missing about 3/4 of the bleed process steps. From what I remember Henry’s video is the correct process

@dc2927 9 күн бұрын

I am a newbie, but why do you need to take the wheel off and pads out (I understand why the spacer is needed after tha)