pink poodle
気が狂っている男
Just remove the caliper and drop it below the chain stay...you don't need heaps of displacmenet, just enough to change the angle and lower the bleed port.
Is your but/olive combo at the lever done up tight enough?
M785 rear calliper - where is the leak?
- Thread starter c3024446
- Start date
Is your but/olive combo at the lever done up tight enough?
stirk
Burner
The negative pressure which draws the pistons back into the calliper when you release the lever wouldn't build up that quickly to suck lots of air in without also visibly leaking oil. :noidea:
If the air is near the bleed port I would think the same pressure would be on that pocket of air regardless of bike orientation, air in the calliper is air in the calliper.
The issue would seem to be at the cylinder end but is opposite to moorey's symptoms.
If the air is near the bleed port I would think the same pressure would be on that pocket of air regardless of bike orientation, air in the calliper is air in the calliper.
The issue would seem to be at the cylinder end but is opposite to moorey's symptoms.
c3024446
Likes Bikes and Dirt
Putting the bike vertical achieves the same thing though? And yes, the lever connection is nice and tight and not leaking, have checked this. Bubble is forming somewhere between where the hose comes around the bottom bracket and the calliper. It floats up to the highest point which is behind the pistons causing the squishy feel.
Flow-Rider
Burner
Nice and tight with a cable tie and clean every bit of liquid off the brakes.
stirk
Burner
Cable tie will lose pressure as it leaks, good strong rubberband looped tight will keep the pressure on all the way to the bar.
Flow-Rider
Burner
What ever tickles your fancy, If you lose pressure you should find a leak unless it by-passes at the handle.
stirk
Burner
Stetchy rubber over hard plastic anyday.
moorey
call me Mia
Stretchy rubber ain't going to apply the pressure needed to push out oil if there's a tiny leak, possibly.
stirk
Burner
I've met some rubber rings which would squeeze a drop from a celebrate priest let alone a little oil from a brake system.
moorey
call me Mia
Yeah, celibate priests are hard to excite.
stirk
Burner
Celebrate ones not so much, actually any priest :doh:
pink poodle
気が狂っている男
Again with your mythical creatures...
c3024446
Likes Bikes and Dirt
Solution has been found. Now know why the leak was so hard to find - there wasn't one!
I was doing a poor job of getting all the air out of the calliper apparently. Internally routed brake hose and the bleed port pointing down when bike is horizontal makes for patience required during the bleed, can be tricky to get rid of all the air......
Seems solid as a rock now. Cheers everyone.
I was doing a poor job of getting all the air out of the calliper apparently. Internally routed brake hose and the bleed port pointing down when bike is horizontal makes for patience required during the bleed, can be tricky to get rid of all the air......
Seems solid as a rock now. Cheers everyone.
stirk
Burner
Now onto your strange air in the system when bike is verticle issue. A bubble in the reservoir is my guess.
mitchy_
Llama calmer
if they have a bleed port on the caliper (i dont use shimano junk, so i don't know) then try reverse bleeding them.
fill a syringe with fluid and push it from the caliper up to the lever end... i always get a nice solid bleed that way, and its the direction air wants to travel usually. i have had chain stay mounted brakes on a couple of bikes and never had air in the system.
fill a syringe with fluid and push it from the caliper up to the lever end... i always get a nice solid bleed that way, and its the direction air wants to travel usually. i have had chain stay mounted brakes on a couple of bikes and never had air in the system.
stirk
Burner
I wish Daiwa made cycling components.
mitchy_
Llama calmer
that's nice.
The Duckmeister
Has a juicy midrange
+1 to this; I use this method for all brakes, works a charm.