SOHC.co.uk Forums > CB350/400

CB400 - Twin discs? thoughts

<< < (2/3) > >>

Tomb:
Its a leverage issue, if you have a large piston M/C travel will be less on the lever but effort required will be higher.
A smaller piston M/C will be easier to work, less effort, but have more movement on the lever, meaning you can exert more pressure at the pads for the same strength hand.

I have improved braking by doing this, and with good hoses and well bled brakes not much travel extra.

The Triumph may have had too much leverage hence needing a bigger M/C.




Tom

ka-ja:
Honda 400/n or dream will go in the 400/4 yokes

gtmdriver:
+1 for Tomb.

Pressure  = Force/Area so for a given force:-

Larger diameter master cylinder gives less lever movement but a lower fluid pressure.

Small diameter master cylinder gives more lever movement but a higher fluid pressure.

If you did manage to fit a second disc though you may well have to move to a bigger diameter master cylinder in order to supply fluid to two calipers.

When I decoupled the brakes on my Moto Guzzi I had to fit a 15mm master cylinder in place of the 13mm original.

Integra99:
Thanks all, yes I agree the single disc does a good job..  and I should probably just leave it as is.. but I do a lot of track days and the 400/4 brakes are quite a shock to the system but its mostly about looks and the challenge being a custom bike.

The 400n Superdream looks a potential donor, I think even 31mm forks?

I need to investigate that option first I think.. it really will be a phase 2 part of the project though as said in the replies its plenty adequate for now but will be on wish list list.. as for the M/C very useful and it explains why my old M/S on my XS750 struggled with the 4 pot calipers I fitted originally, Now running an R6 front end.

ka-ja:
Hi,
    CB400/4 forks tubes are 33mm dia. the same as the 400 superdream, as with  all old bits, getting stuff in good condition is a headache, and staying with spoked wheels instead of superdream comstars is expensive, but the braking is much improved, especially in the wet.

Navigation

[0] Message Index

[#] Next page

[*] Previous page