Shimano Bleed – Unable to pass fluid from Syringe to lever or lever to syringe?
I struggled when bleeding mine, using 2 syringes that come with the Epic kit. I found that when pushing fluid from the caliper up to the lever, the pressure required to actually push the lever syringes plunger up was too much for the seals in the lever, resulting in fluid seeping out of the lever reservoir.Posted 4 years ago
I got round that by just taking the lever syringe’s plunger out when doing that stage.
This mimics what you would do with a Shimano bleed kit and its funnel.
Hi all, i need some bleedin disk help.
New Shimano M785 disk brakes, shortened hoses but needing bleeding. When i go to do this it takes super human efforts to pass any fluid from the syringe to the lever. Also, when dripping back from the lever to the calliper nothing happens.
If i pull the lever fluid comes through though.
At one point fluid was seeking out (when pulling the lever) from beneath the long top cap on the brake lever. I took this apart, blew on it a bit, put it back on and then it seemed to stop??
My best guess is that there’s something very small stuck in there somewhere, yet it still kinda works as it is but i know it’s not 100% bled right.
On a side note, i can bleed a set of Avid Elixirs very easily, zero effort required to feed fluid through the hose.
Any suggestions?Posted 4 years ago
Yes i have the same pressure issue. I’m using the funnel and syringe method. Have tried different twists on the funnel (not to tight and tighter) but make no difference.
Not tried it with no funnel though, so can see if that makes a difference. The issue though is that the funnel does not drip back to the calliper, so there must be more to it?Posted 4 years agosteel4realMember
Yep like francisco… above on Deore 596’s I found the same thing as that. Although one brake did leak a bit, the other one didn’t.
Force required was quite high with the Epic bleed solutions kit but I found lubricating the plunger of the lever end syringe with mineral fluid seemed to help.
Couldn’t get a good bleed adhering to the Shimano method and funnel but the Epic kit worked a treat – all be it with a bit of fluid leaking from the lever seals.
Edit – good question dmort !Posted 4 years ago
Yes, bleed block in place:
1. Remove wheel + pads. Add Yellow bleed block
2. Level lever, pop lever port screw and apply funnel with 2cm of fluid into lever port
3. Prepared syringe with genuine Shimano Mineral oil (lubed plunger with mineral oil) attached to calliper bleed port (just above 7mm spanner).
4. Plunger removed from Funnel, open calliper port (spanner) push on syringe to feed to funnel.
No fluid moves up, or with the mother of all effort it does in a non smooth hand hurting way.
5. Working in reverse, nothing drips out from the line when letting the funnel bleed to the calliper.
However if i squeeze the lever the fluid will come out at the calliper end.
Managed to pull back on the syringe to draw air through from the line (whilst the funnel is attached and filled with oil). This was again very hard to do but it did pull out some air.
so yeah, all the suggestions and silly things to miss along the way are covered (i think). I’ve tried it with the servo wave and lever adjust at different settings, still no joy.
Still need help!!!Posted 4 years ago
Been following those instructions, hence trying to open over 1/8 of a turn as shimano state. Not tried a full 1/2 turn though.
Shop is a last resort, be great if i had somewhere really good to take it to. But even then they need it booking in so i won’t get it done anytime soon enough to get out this weekend.
Also – I really want to be able to do this myself. I can do everything else and even sorted out the tricky Avid bleed system. There must be a way. Currently thinking about fitting new goodridge hose kit to ensure there’s no blockage.Posted 4 years agosteel4realMember
binno – it does sound like you have covered it all and if you can do Avids then competent 😉
I usually open the bleed nipple 1/4 to 1/2 turn as when fitting the syringe hose over it I always move it – towards the closed position for some reason !
Maybe try removing the bleed nipple completely and check for blockage ?Posted 4 years agoEcky-ThumpMember
I’ve had this recently.
Whilst I’d bled the first 5 of the 6 M785s I have without any issue, the 6th one refused to bleed. 😕
The solution is to slacken-off the bite point adjuster.Posted 4 years ago
When it’s screwed in fully, it appears to push the piston far enough forward to isolate the master cylinder from its reservoir and this prevents bleeding in either direction.
A bit of a design flaw if you ask me, but only a minor inconvenience once you know about it.
“•Easy-bleed System” according to Shimano.Posted 4 years ago
must be a different binno.Posted 4 years agonickdaviesSubscriber
When I did mine I’m pretty sure I opened the bleed nipple more than 1/4 turn. It wouldn’t go in on 1/4 turn, as I didn’t bother with instructions I just opened it more till it went in. Probably best parts of a full turn IIRC.
as mentioned with the epic kit yes you have to remove the plunger from the reservoir end. You seem to have everything else cock on so if you can’t bleed them with the nipple open a good full turn sounds like you have an issue that’s more serious.
What about trying attaching the funnel to the top, filling that with fluid and then pulling through from the caliper end? Maybe something has broken off inside causing a blockage?Posted 4 years ago
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