Author Topic: Clogged Brake Fluid Reservoir  (Read 2676 times)

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Offline NorthWestYJ

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Clogged Brake Fluid Reservoir
« on: April 22, 2011, 10:29:37 AM »
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!!

Offline NorthWestYJ

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Re: Clogged Brake Fluid Reservoir
« Reply #1 on: April 24, 2011, 09:15:30 AM »
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

Offline Bob Wessner

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Re: Clogged Brake Fluid Reservoir
« Reply #2 on: April 24, 2011, 10:20:45 AM »
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.  ;)
We'll all be someone else's PO some day.

Offline TwoTired

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Re: Clogged Brake Fluid Reservoir
« Reply #3 on: April 24, 2011, 10:50:07 AM »
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,
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Tom in Newcastle......Ontario

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Re: Clogged Brake Fluid Reservoir
« Reply #4 on: April 24, 2011, 10:52:47 AM »
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
1978 cb 550k......stock,my first re-build


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