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Rear brake master cylinder

B

Bilga

Joined Jan 2017
44 Posts | 5+
Sydney, NSW
My rear brake master cylinder seems to be missing the little clear cover that is supposed to be over the fluid. The rear brake is still working, so I am confused as to how it is working and what damage could be caused.

What do you think I need to do, and can I source one of these cover/caps from somewhere.

Images below

fc85158c0544214dc55a0a8adf8c2309.png


a6e54861376985afb17f23e47b4d1378.png


Also, I've got a dual rear brake system that was set up by the previous owner that I don't use and dislike (there is a rear brake lever on the handle bars that is functional along side the rear brake foot lever. How would I go about removing this? (pictured below)

Top of master cylinder:
842122b7de62888c70063053109430a3.png


Handle rear brake lever:
c143dbba22990b906f147ec1f3b455d7.jpg
 
If you have Rekuse that handle bar rear brake will come in handy from time to time. I got into a little trouble on a hill trying to turn around. To say the least it was a bitch. Need that brake!! Bike was on top of me each time I tried to get the bike off me gravity would screw me. Rekuse NO compression to hole the bike. Funny to think about it now. About the window?????? I would of thought it wouldn't holed fluid???? Sorry no help.
 
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That master looks bad. I am guessing the sight glass fell out and it is so rusted inside the fluid cant get to the sight glass area. The sight glass area show level only through a hole that must be plugged??? I would be replacing the master for sure.
 
I am also guessing the front lever for the rear does not work as it would be impossible as per no fluid in the rear and a top load hydraulic system. :)
 
The back brake (foot lever) is still working, the handle lever isn't really working it puts resistance when trying to push it but you can still move it forward. The rod isn't moving up and down so I'm not sure how it's working.

I was thinking about pulling it apart and rebuilding it, anyone done this and have any insight?

Also, where would I be able to purchase the clear plastic cover?
 
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Bilga said:
The back brake (foot lever) is still working, the handle lever isn't really working it puts resistance when trying to push it but you can still move it forward. The rod isn't moving up and down so I'm not sure how it's working.

I was thinking about pulling it apart and rebuilding it, anyone done this and have any insight?

Also, where would I be able to purchase the clear plastic cover?
Click to expand...
If you want to keep the front leaver that clear plastic window will have to be replaced by something more resisting , as with that setup your putting pressure in that chamber that originally only serves as a reservoir for the fluid , that is likely why it popped out ,and most likely will happen again . Don't know if the window can be bought on its own . The leaver should have no pressure now as the circuit is obviously open

Enviado do meu HUAWEI Y360-U61 através de Tapatalk
 
Hard to say from the pictures but it looks like someone might have installed a steel sleeve in there to block out that window area.
 
Best to just replace the rear master and go with that. The sight glass should not come out even with the addition of the add on hand lever. Yes I would also guess the system has had something done to prevent loss of fluid as the sight glass is to confirm fluid level in the system. I still think the port is blocked that allows the sight glass level. If you want to remove the front lever this is simple. Replace the master and do not put the master cover for the front lever on and remove the components. But if you have a Recluse you will wish it was still working.
I don't think any more pictures will help anything as the master is done and needs to be replaced. This is a brake system and the sight glass is a part of it and its missing.
 
FE350 said:
Best to just replace the rear master and go with that. The sight glass should not come out even with the addition of the add on hand lever. Yes I would also guess the system has had something done to prevent loss of fluid as the sight glass is to confirm fluid level in the system. I still think the port is blocked that allows the sight glass level. If you want to remove the front lever this is simple. Replace the master and do not put the master cover for the front lever on and remove the components. But if you have a Recluse you will wish it was still working.
I don't think any more pictures will help anything as the master is done and needs to be replaced. This is a brake system and the sight glass is a part of it and its missing.
Click to expand...
As far as I know I dont have a recluse nor know what it is. I dislike the lever as it gets in the way and just want the foot brake. Is it worth pulling down the master cylinder and restoring it.
 
If You do have a Rekuse You'd know it. If it's set up right put it in first gear keep bike at idle let out the clutch if doesn't move now give it a little throttle bike will move that's a Rekuse. Me as an intermediate rider I like when you would have use the clutch a lot and/or fall a lot that is where the Rekuse shines. In the fast stuff I don't need or want it there but I can live with it.
 
Rainerio said:
If You do have a Rekuse You'd know it. If it's set up right put it in first gear keep bike at idle let out the clutch if doesn't move now give it a little throttle bike will move that's a Rekuse. Me as an intermediate rider I like when you would have use the clutch a lot and/or fall a lot that is where the Rekuse shines. In the fast stuff I don't need or want it there but I can live with it.
Click to expand...
Yeah, I don't have a rekluse not will I get one.

So it will inevitable will come off. Just need to probably rebuild the cylinder and sort the clear window parts out.

Anyone ever done a rear master cylinder rebuild?
 
I would guess it to be allot less work and easier to replace the master over rebuilding as if it has been modified or if pitted inside it will be useless. Due to not having a sight glass the system holding fluid is a mystery to me. As for trying to rebuild something that has possibly been modified and or is in very rough shape to not allow fluid flow through is another issue in itself. if you don't have allot of experience doing this sort of work it will likely be a big pain and a waste of a rebuild kit. Also if you source a sight glass only to find another issue inside. If you don't know what your looking for or at can be another. If you are confident that you can tell if the master is in good enough shape to rebuild and somehow manage to seal a new sight glass into a master that was fit and sealed prior by press or bond.

Check on the sight for a good used one or source one from a supplier. Try Taffy and see if he has one kicking about.
I think the rebuild idea might be opening a can of worms and end up costing more than finding another working one.
 
Looked up price rear master it's $219.00 rebuild kit $23.00 without glass all US $ maybe if you tried hard you could find one cheaper or use on the Net. None are including shipping. Good Luck by the way part #77013060044
 
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Rainerio said:
Looked up price rear master it's $219.00 rebuild kit $23.00 without glass all US $ maybe if you tried hard you could find one cheaper or use on the Net. None are including shipping. Good Luck by the way part #77013060044
Click to expand...
Cheers for all the help guys. I'll just buy a new one to save the headache. For now the one I'm using is working and as they say if it ain't broke, don't fix it. :D

Only a few more issues to get my bike going 100%
 

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