SOHC.co.uk Forums > CB350/400

F2 front brake upgrade??

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K2-K6:
As you say the disc is quite a large size for performance.

I think there is more available from the standard caliper by using a mastercylinder with a smaller bore to increase your mechanical advantage and power through the std components.

The disc is only converting motion into heat, if you can't squeeze it hard enough you simply wont generate heat fast enough to wipe off the motion.

Alternative would be to use a more rigid caliper and make a one off arm to hold it on std fork leg.

470four:
Was chasing Kevin from TTR400.com regarding him making some steel discs for a Four? The standard stainless disc is renowned for being too hard for most pads to get a grip on?

No reply as yet...  :(

K2-K6:
I think what I'm getting at is from riding this sort of era when it was new some of them had a much better brake performance than others.

For example a Yam RD400 about 79ish year had a disc similar in size and material and single piston floating caliper but was much more powerful which seems to dispel some of the theories of why the Honda one felt less potent. The Yam had a much longer/spongier lever travel than the Honda which suggests that the mastercylinder bore was smaller to me but gives your hand a significant advantage over the caliper.

Extend that thought line to try a different master cylinder and you may get somewhere for reletively low cost and hassle.

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