SOHC.co.uk Forums > CB750
Twin disc caliper modification?
sprinta:
Part 2.
I used an original hose brk and removed the hose 'crook' and re-attached it by 180 deg's so that I could use the same brk on both sides for symmetry. I found the std brake hose a bit too short but had a Kawasaki Z900 A4 hose which has the same fittings but was a few mm's longer. (there would appear to be two lengths of the Z900 hose one is the same length as the CB750 and one is slightly longer)
A new solid brake pipe was formed and the ends flared.
Routing the hose requires a bit of faffing around as you have speedo cable, tach cable and the horn to miss when the forks compress in use. Being able to use the steering lock can also be compromised if you are not careful.
It has all installed without too much hassle but it will be necessary to have to remove the whole RH caliper and brk assy in order to remove the front wheel, which hopefully will only be when the tyre needs changing?
Have not had a chance to try it out due to the lockdown and now doubt I will have brake squeal in stereo but hopefully there will an improvement in the braking, if not it looks nice and to my eyes more balanced.
I am currently using the original master cylinder and will evaluate after some use as to if one with a larger piston is required.
Lobo:
Nice looking job Sprinta.
... I’ll be interested to learn if the braking is 2x improved. My K2 stops like a pig (even with sintered pads) ... it takes a lot of effort at the lever. If the (original?) master cylinder pressure output is effectively halved as now supplying 2 brakes, are you actually better off? This is doing my head in!
sprinta:
--- Quote from: Lobo on April 19, 2020, 11:36:14 PM ---Nice looking job Sprinta.
... I’ll be interested to learn if the braking is 2x improved. My K2 stops like a pig (even with sintered pads) ... it takes a lot of effort at the lever. If the (original?) master cylinder pressure output is effectively halved as now supplying 2 brakes, are you actually better off? This is doing my head in!
--- End quote ---
Thanks Lobo.
Hopefully it should improve the braking. I have a Suzuki GT750 and Kawasaki Z900 A4 with twin brakes which both have significantly better braking than the single disc of the CB750, though nothing compared to modern brakes.
I should have included that currently I have not change the original master cylinder.
As you have eluded to, it is not always necessary. Once I have had a chance to use and evaluate the new twin disc setup I will decide if the master cylinder needs replacing as well for one with a larger piston size?
Arch stanton:
Please excuse my jumping in.
Many years ago. I converted my F1 to double disc. But kept the original master cylinder. But the lever was nearly at the bar, way too soft. Without much feel to it.
So I changed it for a GL1000 item. Much better by far.
I am using that very same front end in my current K1.
It does the job.
71 V12:
Well done Andy,
That looks very tidy, nice job👍👍 I agree with your comment about the symmetry, does look better.
Do you have the part number for the GL1000 disc bolts? I guess they are available from DS? Good tip on the flex hose as well.
Need to get back to mine when I complete the huge list of DIY projects currently taking priority.
Let us know how effective the conversion is.
Cheers,
Kevin
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