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 Modifying brake master cyclinder

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T O P I C    R E V I E W
peen0_0 Posted - 01 Apr 2011 : 2:42:55 PM
Does anyone have knowledge of, or can someone tell me about boring out the CB750 front brake mmaster cylinder to 16mm? I've had it suggested to me that this can be done and then fitted with a GSXR kit, with a resultant improvemnent in braking. Anyone have any thoughts, knowledge of this that you will share?
Cheers, Tony.
7   L A T E S T    R E P L I E S    (Newest First)
conker Posted - 03 Apr 2011 : 11:17:38 PM
I left the rubber bellows out of the reservoir on my Lockheed master cylinder. While I was riding it, it took a gulp of air instead of fluid!- whoops, NO BRAKES.
peen0_0 Posted - 03 Apr 2011 : 11:39:22 AM
Interestingly, according to the chart in this link, the stock Honda CB750 Master cylinder is well within the desired range for good brake performance, with the system that we have in place.Just goes to show that sometimes you need to leave well enough alone, but I wouldn't have known this without the advice that I have been given. Thanks again. Cheers, Tony.
peen0_0 Posted - 02 Apr 2011 : 5:17:10 PM
You're a gentleman big fella, thank you. This is goping to be very helpful, as its exactly what I am after. Now to get the 17 year old year 12 Maths genius to help me work out the best ratio. Cheers, Tony.
Bummers Posted - 02 Apr 2011 : 3:46:23 PM
Have you seen this: http://www.vintagebrake.com/mastercylinder.htm
peen0_0 Posted - 02 Apr 2011 : 2:55:24 PM
Thanks to both Allan's for the advice.Nothing on this topic is too long winded. I've got some good brake specilaists here in Bendigo as well, so might have a talk to them? We're running a single disc on the new outfit, with a 4 pot caliper, hence the query about better master cylinder performance. Cheers, Tony.
Allan Posted - 02 Apr 2011 : 07:17:19 AM
there is a place in west brunswick that puts in statnless steel incerts in master cyclinders
Alan Posted - 01 Apr 2011 : 8:06:31 PM
If you want to change the bore it is quite easy and any decent brake specialist can do it. What you need to be careful of is if you go too big with your bore then you might give yourself a harder braking action. Although its hydraulic it works like a lever, big bore in the master cylinder means greater displacement of fluid which will lead to less travel on your lever but a harder action. if you went the other way and put a smaller bore in your master cylinder then you would end up with greater leverage and more travel at the lever and a more progressive brake.
Sorry if that was a bit long winded

Alan sidecar 21 WA

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