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Took the cover off of Kim's 79 CM400T to figure out why the brakes were so weak. The above is what I found. I already need to replace the white plastic cup since it is very weak and cracked from age so there's $30 from bikebandit, as well as the diaphragm and cover since the diaphragm is disgusting and the cover is warped another $30-$50. I need to decide if I should bother cleaning the above or just replace everything with a generic master cylinder from e-bay like this click here and get a custom stainless steel line.

What's the verdict from those who've been here before? Clean and repair or just replace and get a new hose to match the new master cylinder?
 

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bryantjt said:
What's the verdict from those who've been here before? Clean and repair or just replace and get a new hose to match the new master cylinder?

Just get the new one off EBay - bolts right up, no muss no fuss, no leaks, works great.
 

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Haha my stock one had that stuff too when I took it apart. I bought a shiny new aftermarket one instead.
 

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I think you'd be pleasantly surprised if you bought a new master, stainless line, and deglazed the rotor. Makes a world of difference.

GB :mrgreen:
 

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Also if you want extra cleanliness, take apart the caliper as well. When the piston was removed on mine, I found more of the aforementioned sludge built up in there :shock:
 

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krukster86 said:
Also if you want extra cleanliness, take apart the caliper as well. When the piston was removed on mine, I found more of the aforementioned sludge built up in there :shock:


You mean like this???
[attachment=0:2t31ihyg]S5030404.JPG[/attachment:2t31ihyg]
:lol:


GB :mrgreen:
 

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I own the CM400t and just wondering what complete master cylinder off ebay would be a direct replacement ? I am having a hard time finding it. Is there a universal one out there that matches up to the existing brake hose coming from the caliper?

thanks,
Dave


tbpmusic said:
bryantjt said:
What's the verdict from those who've been here before? Clean and repair or just replace and get a new hose to match the new master cylinder?

Just get the new one off EBay - bolts right up, no muss no fuss, no leaks, works great.
 

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Discussion Starter #11
The ninja 250 ones were cheap when I was looking to replace ours. They have a different fitting though so either an adaptor or new hose is needed. Z1 enterprises can probably hook you up with the fitting or hose, that is where I got our stainless braided one.
 
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