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Discussion Starter · #1 · (Edited)
What kind of brake performance should I expect from the front disc of my ‘81 CM400T? When coming to a firm stop, applying the front brake will dive the front end bringing the bike to a slow stop. When firmly applied at a stop, I can get the wheel to break free with some effort. Bike still has the original pads but I did rebuild the master cylinder (less the reservoir) and bleed the system. I do have some concerns that the oring between the plastic reservoir and body is leaking. Any suggestions?
 

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A quick look at 3 ebay rebuild kits reveals that the o-ring size is 39.7mm x 3.5mm, so choose a material resistant to glycol ether brake fluids.
 

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If your master cylinder had rusty gunk in it your caliper needs a rebuild too (easier than you'd think). New brake pads are a good idea, 40 year old ones have probably degraded in at least one way
 

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First toss those old hard brake pads and replace them with new ones. They've outlived their life and then some.
Next replace the old rubber brake hose with a modern braided hose.
Rebuilding the caliper may not be needed if it's working properly, pistons retracting slightly-slides on the mount pins-no leaks-etc.
After all this if you want more aggressive braking then you would switch to a 14mm-9/16" master. Your current one is 5/8"
 
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