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Persistant bubbles in master cylinder reservoir
Moderators: paul doran, Taffus, KeithZ1R, chrisu
Persistant bubbles in master cylinder reservoir
Hi all.
I replaced/upgraded the master cylinder on my Z1B to accomodate a second disc recently. New M.C. bought from Z Power. All installed but when bleeding I am still getting a handful of airbubbles being released through the small hole in the base of the reservoir each time the brake lever is released after pulling it in. There’s about half a dozen each and every time. This went on for the bones of three hours yesterday and about the same again today. Brakes are still quite soft so something still has a way to go.
Is there something I need to do to push this on a little? Am I looking at a leaking M.C or air caught in some other area of the upper brake line? I though this would have recified itself by now.
Any advice welcome.
Thank you.
Stewart
I replaced/upgraded the master cylinder on my Z1B to accomodate a second disc recently. New M.C. bought from Z Power. All installed but when bleeding I am still getting a handful of airbubbles being released through the small hole in the base of the reservoir each time the brake lever is released after pulling it in. There’s about half a dozen each and every time. This went on for the bones of three hours yesterday and about the same again today. Brakes are still quite soft so something still has a way to go.
Is there something I need to do to push this on a little? Am I looking at a leaking M.C or air caught in some other area of the upper brake line? I though this would have recified itself by now.
Any advice welcome.
Thank you.
Stewart
Re: Persistant bubbles in master cylinder reservoir
tie the lever hard against the handlebar with a cable tie overnight & check your brake line connections for leaking fluid & check around the mc piston for leaks
Re: Persistant bubbles in master cylinder reservoir
I had the same problem with a new master cylinder from z power, I gave up and put an old single disc cylinder on as a temporary measure, will try again when I've got a bit of time.
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- Hardcore
- Posts: 1329
- Joined: 18th Jul 2008
- Location: Derbyshire/London
Re: Persistant bubbles in master cylinder reservoir
Clearing the air from the system after fitting new components is not a quick job and you need to persevere but you will get there.
Regards
Regards
Re: Persistant bubbles in master cylinder reservoir
Thanks for the replies guys. I’ll keep going for a few days more .
Re: Persistant bubbles in master cylinder reservoir
z1bman wrote:tie the lever hard against the handlebar with a cable tie overnight & check your brake line connections for leaking fluid & check around the mc piston for leaks
Yep, have that done ( I read that in another post somewhere on here last night.)
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- Hardcore
- Posts: 2051
- Joined: 3rd Apr 2009
- Location: leverington UK
Re: Persistant bubbles in master cylinder reservoir
Don't pull the lever all the way to the bar and pull just over half way and release slowly, been using this method to get the last bits of air out for years, longest I've ever spent is around 40 minutes doing this job.
Re: Persistant bubbles in master cylinder reservoir
I use the same method as Mr Edwards and always worked for me to
Re: Persistant bubbles in master cylinder reservoir
I had this problem donkeys years ago. It turned out to be air trapped in the brake line splitter. If you've got one unbolt it from it's mounting and change the orientation to as close to vertical as possible then tie wrap the lever in over night.
Pete
Re: Persistant bubbles in master cylinder reservoir
I’m guessing my patience is the major issue here.....
Will try those additional pointers out, thanks guys.
Will try those additional pointers out, thanks guys.
Re: Persistant bubbles in master cylinder reservoir
If you cannot get it to go hard (ooh err missus)
Isolate one side at a time (at the splitter) and bleed that. If it goes hard on one calliper but not the other you have the culprit.
Isolate one side at a time (at the splitter) and bleed that. If it goes hard on one calliper but not the other you have the culprit.
Z1-R D1, Z650 B2, Z1-B & ZRX 1200 A1P Catch 'em if you can at www.Zedrider.co.uk
Re: Persistant bubbles in master cylinder reservoir
pertonpc wrote:If you cannot get it to go hard (ooh err missus)
Isolate one side at a time (at the splitter) and bleed that. If it goes hard on one calliper but not the other you have the culprit.
Like it - nice one centurion!
Re: Persistant bubbles in master cylinder reservoir
I agree with moizeau . there is a "high " point on the splitter that traps air. Disconnect if from the bottom yoke and turn it as far as you can clockwise so the trapped air has to rise out, no need to undo any hydraulic unions, , get something to hold it at that angle then bleed again.
gray
Re: Persistant bubbles in master cylinder reservoir
Hi.
This is a method I learnt whilst in the aviation industry. Pipe runs in aircraft are long and take a torturous routes. Back bleed from the caliper. I've used this on all my bikes with standard brake set ups [ there's been many ] and its 100% effective and only takes about 30 mins max for a twin disc set up.
Use a large syringe to feed the caliper and a small one to remove bled fluid from the reservoir. Bleed one caliper a couple of times then switch to the other. Alternate between them a couple of times more. Air likes to rise and will always head to the reservoir. If this doesn't work then the systems got a leak or suspect component.
Alan
This is a method I learnt whilst in the aviation industry. Pipe runs in aircraft are long and take a torturous routes. Back bleed from the caliper. I've used this on all my bikes with standard brake set ups [ there's been many ] and its 100% effective and only takes about 30 mins max for a twin disc set up.
Use a large syringe to feed the caliper and a small one to remove bled fluid from the reservoir. Bleed one caliper a couple of times then switch to the other. Alternate between them a couple of times more. Air likes to rise and will always head to the reservoir. If this doesn't work then the systems got a leak or suspect component.
Alan
Re: Persistant bubbles in master cylinder reservoir
Thanks guys.
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