SOHC.co.uk Forums > CB350/400

Rear disc conversion

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Laverdaroo:
Simply stunning mate, looks absolutely brilliant and like you said, looks pretty much OE

allankelly1:
Got torque arm sorted today



And now fitted on

Must admit pretty proud of what has been achieved so far and will leave it to you to decide, but looks factory fresh / OM








Still got to fit the disc carrier locker unit which is now designed in my head and the final design of caliper hanger has now being subbed out to a mate. So going to start work out how to modify the rearsets to take a master cylinder as that is really the next thing to be solved

Catch up soon

Best wishes Al


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McCabe-Thiele (Ted):
How do you determine the rear brake pressure on the disk to prevent rear wheel locking up in the dry?

allankelly1:
Hi Ted

Just need to source the correct Master cylinder bore and any brake system can be made to lock if required

Really it’s just simple hydraulics theory where a for a fixed size caliper piston,  a smaller MC  bore will give more “feel” with more pedal movement to fully apply the brake and a bigger MC bore will give less pedal movement and  “feel” etc due to the different size MC bore and swept volumes

On my Rd like lots of others that have a twin disc 350 we have changed  from a standard 5/8 to a 1/2 bore for the front brake MC cylinder and the change is like night and day even with slightly more lever movement due to the reduction in bore size

Interesting for my twin disc  front conversion I used the original single M/C  from D/S with no problems even though in theory the volume of fluid needed is twice the volume due to the master cylinder now operating two pistons of roughly the same diameter as the original single piston unit

And currently as the Brembo unit is from a cagiva Mito that has the same size disc as currently now fitted to the Honda (226mm) for a starting point have for the time being got the same M/C as fitted to the Mito

Lastly it will also depend on “lever length” for my rearsets conversion to get the correct feel and braking


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Tomb:
Love this work.

And agree with Allan Kelly, reducing MC piston dia' on some of my old bikes has made a huge difference to braking ability, or the other way round I have put bigger (more pistons) calipers on and reach the same effect. Yes as Allan says, more lever travel, but when doing the mod I upgrade to braided steel hoses and service the brake so no real difference is noticed.

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