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Author Topic: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f  (Read 1357 times)

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Offline cb750fbomb

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help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« on: August 11, 2009, 01:44:53 PM »
Anyone ever find these? I've found kits for the front, but not for the back.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« Reply #1 on: August 11, 2009, 02:08:57 PM »
$39.76 from ServiceHonda.com 43530-410-305. Still available
$52.76 MSRP from BikeBandit.com

Any dealer can order it but take them the part number $52.76 MSRP
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Offline hapakev

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« Reply #2 on: August 11, 2009, 05:52:00 PM »
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Offline cb750fbomb

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« Reply #3 on: August 11, 2009, 06:36:46 PM »
Even cheaper :) thanks. don't know if I will have to rebuild it, but I having a feeling that I will. I'm still trying to figure out what's causing the problem, but the movement inside the master cylinder seems smooth enough. What seems bad about the mstr cyl. is that the clip and the part that's under the clip is corroded pretty badly.
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”

Offline BeSeeingYou

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77
« Reply #4 on: August 11, 2009, 06:53:00 PM »
Are you talking about the push rod and the larger washer under the boot.  This seems to trap dirt, moisture and brake fluid over time.  The problem you will have is the push rod is not included with the F2/3 kit and is not available separately.  It is the same push rod as the F0/1 and for this bike it is included with the kit. I put some thick grease in my boot to keep the corrosion at bay.  Whether this was a good idea time will tell but no problems so far.
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Offline cb750fbomb

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« Reply #5 on: August 11, 2009, 07:15:41 PM »
Can anyone tell me symptoms of the master cylinder needing a rebuild? I'm wondering if what's going on with mine is the master cylinder.

original rear brake post:

http://forums.sohc4.net/index.php?topic=54020.msg580204#msg580204
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”

Offline BeSeeingYou

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77
« Reply #6 on: August 11, 2009, 07:35:18 PM »
Leaking brake fluid would be a definite reason.  Unable to build up pressure for effective braking, slow loss of pressure on the lever as you hold it in would be some others.  Another reason that the pads may not retract is a blocked fluid return hole in the reservoir.  Unless you know that this has been rebuilt some time in the near past it could be 30 year old parts.  Maybe enough reason right there especially if you have to take it apart anyway.
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Offline cb750fbomb

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« Reply #7 on: August 11, 2009, 07:50:11 PM »
The reservoir has only one hole in it as opposed to some that have 2.
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”

Offline BeSeeingYou

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77
« Reply #8 on: August 11, 2009, 08:19:19 PM »
I know yours is different from mine as the reservoir is separate so I am not sure of how it is laid out.  This picture is of mine from the bottom and you will see a hex head in the upper left under the reservoir.  I have to take this off to get access to the return hole.  There may be something similar on either your res or the cylinder body.  The return hole is almost impossible to see looking in the bore when I had the piston out and difficult to see  looking down into the res as it goes out from the side and is near the bottom.
« Last Edit: August 11, 2009, 08:25:19 PM by srust58 »
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Offline cb750fbomb

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« Reply #9 on: August 11, 2009, 09:40:16 PM »
After that last post, srust, I'm definitely taking it all apart and soaking it in something to clean it out real well. Thanks
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”

Offline cb750fbomb

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Re: help needed. having trouble finding mast. cyl. rebld. kit for rear brake 77 750f
« Reply #10 on: August 12, 2009, 04:02:47 PM »
I just got my master cylinder apart and I've never seen anything so nasty. All the internal parts are fine and they seem to be new, but it looked like someone poured oily, muddy water in the thing. The liquid inside really looked like water from a mud puddle in gravel driveway.
« Last Edit: August 14, 2009, 10:01:29 AM by cb750fbomb »
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”
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