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I've not had to do anything with Shimano brakes before (having always had SRAM) but just spotted that my wife's lever pulls to the bar so I guess it needs a bleed.
Is this everything I need for Deore XT M8120 4-piston
https://amzn.eu/d/agZ4U5Chttps://amzn.eu/d/agZ4U5C
Any better options that I can get delivered as quick as Amazon?
Also is it a Shimano thing to suffer from hanging the bike up by the front wheel?
Cheers
My Shimano brakes always used to go tot he bars after hanging by the front wheel. Was "interesting" in the Alps when the bikes were hung off the back of the buses for transport! But pumping them always bought them back, which was just as well with a 1000m descent in front of you.
As for bleeding, if you have a pair of the old reverb syringes (with the nitrile seals) then that is all you need really. You can use one as a funnel to do a simple handlebar bleed, or use both for a push-me pull-me full fluid change.
Have you checked pad wear first?
Cool cheers, I’ve just ordered a funnel kit (my Reverb syringes went in the bin because I’mb never going to own a Reverb post again!)
@kayjay pad wear is fine 👍 I guess it’s a combination of it always being hung up by the wheel and it’s been ridden a fair bit.
annoyingly also spotted the front hose is kinked just above the clamp on the fork, it looks like the bars have probably spun even she’s crashed at some point and bent it, so will get that changed. It’s one of those things that would either be fine for ever more or one day the hose will just split.
I’ve just ordered a funnel kit
I’m going to recommend always sticking the funnel on for any type of bleed or even just pushing the pads back to fit new. The rubber diaphragm/membrane in the lever reservoir of recent Shimano brakes appears to be rather susceptible to bursting if put under too much pressure.
Have a read of this thread and don’t join those of us who have cocked up
https://singletrackmag.com/forum/topic/shimano-brakes-weep-port-i-had-no-idea
OK and continuing my not understanding Shimano woes…
Are both of these the same and compatible with M8120 brakes 🤔
https://www.wiggle.com/p/shimano-xtr-m9000-m9020-m987-disc-brake-hose
https://www.wiggle.com/p/shimano-sm-bh90-hose-xt-m8020-long-banjo
If hanging by the wheels causes brake problems, you already had some air in the reservoir of the lever. Same can happen turning the bike upside down - even worse is pulling on the levers in that position. If the brakes had been bled properly and had no bubbles in the reservoir, there are no problems. It is very common to have a little bit air at the lever, and it will not cause problems unless the air moves to the hose or caliper.
Rubber_Buccaneer - yeah, the bursting problem is real. I broke one lever in the shop by just pushing the pistons in for a pad change, now I always put in the bleed cup with a little oil in it first, so the excess oil can escape into the cup and not break the lever. Especially so if the brakes have been bled with the pistons partially out, that way you get more oil in the system than can fit back in the reservoir, causing over-pressure when you push the pistons in.
Noted about the diaphragm cheers!
Are both of these the same and compatible with M8120 brakes
I don’t know but one is described as normal banjo normal bolt and the other long banjo short bolt so if no one chips in with better info I’d choose based on what is currently fitted. Pics on Shimano’s site should help to ID
Thanks, I’ve ordered both and I’ll send (hopefully the more expensive one) back, I’ll check them carefully.
This seems to suggest that 9000 / 9020 and 9120 are all the same as the 8****
https://allterraincycles.co.uk/products/shimano-xtr-xt-slx-sm-bh90-rear-disc-brake-hose