Topic: Clogged Brake Fluid Reservoir

[NorthWestYJ]

Hello all!
I recently bought at 73 CB750 that hadn't ran since 94 and Ive been working on getting it ready to be licensed. One problem that I have not been able to figure out is how to un-clog the brake fluid reservoir it seems to be clogged with dried brake fluid.  I have tried rubbing alcohol and brake cleaner.  Anybody have any ideas?  Thank you!!

[NorthWestYJ]

come on! no one has any ideas? not even a place to buy a new one?  I really need some help guys this is the last thing i need to get it on the road

[Bob Wessner]

Are you saying the inside of the entire unit is covered in this, or just the small holes? I guess, in an act of desperation maybe boil it in some water.  I have no idea if this would do anything beneficial, but then it is likely to do any harm either. I wouldn't use your SO's favorite pot though. 

[TwoTired]

A coated reservoir presents no operational problems, save the pin point bleed hole nearest the brake line outlet.
That tiny hole must be cleared, yet remain tiny.  A narrow pin or needle can be used to clear it if you are careful.  I've also used the tiniest drill bit in the Xacto tiny drill bit set; #80.

However, there may also be a hard coating in the master's piston bore.  I remove this with aluminum oxide paper placed in the end of a wooden dowel that has had a slit cut in one end.  Then spin that in the bore with a drill.

Ensure that the bare piston without rubber bits can move freely in the bore, and you should be good to go for assembly and use.

Cheers,

[Tom in Newcastle......Ontario]

come on! no one has any ideas? not even a place to buy a new one?  I really need some help guys this is the last thing i need to get it on the road

Patience..........................

If the master is clogged with dried brake fluid ,what do the brake lines and caliper have in them......better check..

I have found that a Simple soak loosens up most or all of the dried and gooey remains