Brake Link Front/Rear |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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If the brakes have been delinked, the front master cylinder is operating both disc callipers, so it needs to be a larger diameter than standard not smaller. Check what you actually have before looking for change.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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StevieG
Senior Member Joined: 06 May 2018 Location: West Sussex Status: Offline Points: 138 |
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Just remember depending on what model you have, the front brake lever usually activates the cylinder via a cable. I don’t think it’s a good idea to rely on a cable to do all your front braking. Having one front disc connected to the rear is also a fail safe feature.
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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No sooner the word.... TBH it's still a bit wooden and the reach is too much so I may remove a bit from the end of the lever that contacts the piston. If yours has been delinked and the front master cylinder is working both front discs I wouldn't have thought you'd need to reduce the master cylinder size - if anything it should be increased - as you're effectively doubling the leverage. <edit> sorry Brian posted before I saw your similar reply. </edit>
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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Rumpith
Guzzino Joined: 27 Jun 2018 Location: Wirral Status: Offline Points: 6 |
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Thanks for that,
It would seem I'm looking for a 15mm piston. All the Japanese ones seem to be 14mm or 15.8mm. When I get in tonight I'm going to check whats on the bike as its none standard. Based on what I've been reading today and the advice being given I now think the one on the bike is too small, as there is a lot of travel when nothing happens and then it comes on quite strong.
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Rumpith
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GC888
Senior Member Joined: 21 Dec 2015 Location: Manchester UK Status: Offline Points: 174 |
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If its strong at the end then it doesn't sound like a master cylinder problem, as that would be good or bad throughout the range?
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Rumpith
Guzzino Joined: 27 Jun 2018 Location: Wirral Status: Offline Points: 6 |
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The bike is new to me and needs a bit of work doing to it before i can get it on the road. I'm not in a position to ride it again until this work is done so I will have to leave as is for now. The front brake is a Nissin 5/8 which equates to 15.8mm so may actually be fine, it just didn't feel too great when riding it though it did pull the bike up well if given a hard tug.
I'll let you know how i get on once I've done a bit of work to the bike and get it out on the road. First thing is to replace the 28 year old back tyre and the 18 year old front.
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Rumpith
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GC888
Senior Member Joined: 21 Dec 2015 Location: Manchester UK Status: Offline Points: 174 |
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I had a play on a new Kawasaki a couple of weeks ago the front brake was so 'grabby' until I got used to it, still not sure I liked it over a more progressive action. But was a lot better than the drum on my Montessa that will only stop when you feel like your bending the lever !!
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Ianboydsnr
Senior Member Joined: 14 May 2014 Location: Cumbria Status: Offline Points: 831 |
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I just don’t see that, I regularly ride both my convert and fazer 1000, and switch between the different brakes easily, the convert has no engine braking so the brakes are harder used.
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Both my V50s had linked brakes with both being very good to use, but on both bikes the front brake could best be described as `wooden`/ `crap`, with so much effort needed on such a wide reach on the lever. There is no comparison between the Guzzis and my Fazer with the latter having great `feel` and tremendous stopping power, but I suppose that`s down to advances in technology.
CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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rapheal
Senior Member Joined: 13 Nov 2014 Location: west country Status: Offline Points: 573 |
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A friends BMW has linked braking, and I gather some Hondas do as well
must be a reason its come back ?
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Both my X10 scooters had linked, where the left lever for rear brake did the front too, *IF* you press harder, so if for any reason you wanted rear only and if you then press harder (for more braking effort) the front would grab as well. Got to be quite a PITA TBH. |
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"Chicken nuggets don't dance on a Tuesday."
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telegraphroad
Senior Member Joined: 21 May 2014 Location: M11 J8 Status: Offline Points: 204 |
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A PO delinked the brakes on my Monza and did a very professional job. I know it's a personal preference but I appreciate the increased flexibility to operate front and rear independently. The bike responds really well to a little rear trail braking into corners and the front action is ery progressive and powerful. OTOH my Honda VFR has linked brakes but they are somewhat more sophisticated in that the rear braking force is directly proportional to front wheel braking effort (road friction effect) rather than lever force, and the rear brake pedal has an in built delay before the front is actuated. This lets you trail brake on the rear only with light pedal pressure but also to use the pedal alone in traffic. Hard braking on the front lever brings the rear almost to the point of slipping so hard stops are front lever only.
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V50 Monza
VFR 800FI Herts / Essex border |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Strangely enough, my 1990 Spada III had all that too.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Rumpith
Guzzino Joined: 27 Jun 2018 Location: Wirral Status: Offline Points: 6 |
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What master cylinder did he use on the front to get such good results?
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Rumpith
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Rumpith
Guzzino Joined: 27 Jun 2018 Location: Wirral Status: Offline Points: 6 |
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Right a bit of an update.
I swapped the front master cylinder for another Nissin one but this was off a GSX600 and only had a 14mm piston as opposed to the 5/8" (15.9mm) that was on the bike when I got it. This is much better with a bit more travel and power. Its not as good as it could be though and still needs a bit of a tug on the lever to get the bike stopping as good as I think it can. I think a 13mm piston would be better still. Remembering how good the brakes were on my wifes original V50 of 1980 I would say the best thing to do if you are thinking of delinking the brakes, is leave them alone. However, if you feel you have to delink them I would try a 13 or 14mm piston master cylinder. Any bigger is too big in my experience, giving a very dead feeling lever with little travel, which needs a very strong pull to get the brakes working well. |
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Rumpith
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