Paperclip Posted August 22, 2015 Report Share Posted August 22, 2015 should it be possible to bleed a racing line lever onto a disc brake calliper (both take mineral oil). Then would the outcome be a good thing? Keeping the same power and so on? Totally looking for a reply from Tarty Adam on this subject, has it been tried? I know that Echo have and it worked okay with a 2 pot piston. Quote Link to comment Share on other sites More sharing options...
Mark W Posted August 22, 2015 Report Share Posted August 22, 2015 The Echo disc brake levers were actually a little different to the rim brake ones from memory - the pivot point was moved slightly I think to change the leverage ratio. Quote Link to comment Share on other sites More sharing options...
Ali C Posted August 22, 2015 Report Share Posted August 22, 2015 bad idea, the mechanical ratio is different with a bigger piston at the lever (disk brakes usuallly use ~9mm at the lever apposed to 14mm on rim brakes). This means you'll lose a lot of power and the lever will feel rock solid. Echo just about get away with it (not that I'd ever consider their brakes powerful enough) as the main lever pivot is closer to the piston which claws back some of the mechanical ratio. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 22, 2015 Report Share Posted August 22, 2015 Yup, technically possible, but would leave you with an underpowered brake. Quote Link to comment Share on other sites More sharing options...
Paperclip Posted August 22, 2015 Author Report Share Posted August 22, 2015 Cheers guys, just thinking out loud basically. Had my lever a while now so thinking of changing it at some point. Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted August 22, 2015 Report Share Posted August 22, 2015 bad idea, the mechanical ratio is different with a bigger piston at the lever (disk brakes usuallly use ~9mm at the lever apposed to 14mm on rim brakes). This means you'll lose a lot of power and the lever will feel rock solid. Echo just about get away with it (not that I'd ever consider their brakes powerful enough) as the main lever pivot is closer to the piston which claws back some of the mechanical ratio. With that logic then, a disc brake lever and maggie calipers would give a marked improvement in power? Are there any closed system disc brake levers that would be suitable for this? Quote Link to comment Share on other sites More sharing options...
Ali C Posted August 22, 2015 Report Share Posted August 22, 2015 A few people (myself included) tried that with oldschool closed Hope levers, there is more power but the pads move such a tiny amount that the pads always rub and the lever is so spongy it pulls back to the bar. Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted August 22, 2015 Report Share Posted August 22, 2015 Was that bleed related though? Weren't hope always DOT fluid? Wouldn't mineral oil either eat/expand the seals in a DOT system? With the pad move issue could a smaller bore ID of the hose help with this? Bit of a bugger with compatible parts I imagine. Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted August 22, 2015 Report Share Posted August 22, 2015 Its a cross sectional area of slave and master piston ratio issue, can't be got around* unfortunately. *easily, certainly no more simply than just using the 'right' lever. Quote Link to comment Share on other sites More sharing options...
niconj Posted August 23, 2015 Report Share Posted August 23, 2015 A Disc Brake lever piston with its small diameter pushes to little fluid for a Rim Brake where the lever has a piston with a bigger diameter, ergo pushing more fluid. Just think of how little the pads move in a disc brake caliper compared to what a rim brake pad travels. Quote Link to comment Share on other sites More sharing options...
Felix_HBtrials Posted August 24, 2015 Report Share Posted August 24, 2015 With that logic then, a disc brake lever and maggie calipers would give a marked improvement in power? Are there any closed system disc brake levers that would be suitable for this? The Racing Line nano and Clean lever are the ridable form of you idea. Using a 13mm piston instead of the 14mm, you get 16% more power. If you go to 9mm instead of 14... huge power but like Ali said, little pad movment and always rubbing, plus so much power rim, frame ALL will bend. The Racing Line nano already need quite a straight wheel and good set up to have a decent feeling, plus the extra power requires a booster, and you can still feel some flex, can't imagine with 9mm. BTW, thanks a lot Ali for your input, was planning on trying that at one point, you just confirmed me it's a waste of time Quote Link to comment Share on other sites More sharing options...
MCoen Posted August 24, 2015 Report Share Posted August 24, 2015 Only disc brake this would work with is the Brake Force One. My daughter has been using them for a while. On her bike it is the opposite of what you want to do. She is using the Brake Force One lever with the Racing Line brake cilinders. The brakes use an accelarator in the brake caliper and because of it is is a closed system as the magura and Racing Line rim brakes. At Eurobike this week the present a new model, one that is using water instead of oil Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted August 25, 2015 Report Share Posted August 25, 2015 Only disc brake this would work with is the Brake Force One. My daughter has been using them for a while. On her bike it is the opposite of what you want to do. She is using the Brake Force One lever with the Racing Line brake cilinders. The brakes use an accelarator in the brake caliper and because of it is is a closed system as the magura and Racing Line rim brakes. At Eurobike this week the present a new model, one that is using water instead of oil Pic? Quote Link to comment Share on other sites More sharing options...
Mark W Posted August 25, 2015 Report Share Posted August 25, 2015 I'd forgotten all about Brake Force One. Weren't they trying to do a Kickstarter campaign to fund production at one point? Is she using this lever? 1 Quote Link to comment Share on other sites More sharing options...
MCoen Posted August 25, 2015 Report Share Posted August 25, 2015 (edited) I'd forgotten all about Brake Force One. Weren't they trying to do a Kickstarter campaign to fund production at one point? Is she using this lever? No, that is the old lever from the 1st version of the brake. The new lever isn't "plastic" anymore. Here is a picture with the one-finger lever. There also is another lever available Edited August 25, 2015 by MCoen 1 Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted August 27, 2015 Report Share Posted August 27, 2015 Holy shit! that looks awesome. I really like that. I am guessing she rides with gloves? I would be worries about slicking my fingers on those holes. But it looks great. Quote Link to comment Share on other sites More sharing options...
weirdoku Posted August 27, 2015 Report Share Posted August 27, 2015 That lever/blade combo is pimp! Quote Link to comment Share on other sites More sharing options...
MCoen Posted August 28, 2015 Report Share Posted August 28, 2015 Holy shit! that looks awesome. I really like that. I am guessing she rides with gloves? I would be worries about slicking my fingers on those holes. But it looks great. No she never had issues with the holes and yes she is riding with gloves Here is a picture of the 2 finger lever: Quote Link to comment Share on other sites More sharing options...
Mikee Posted August 28, 2015 Report Share Posted August 28, 2015 In my opinion, all the little holes ruin it a bit. Quote Link to comment Share on other sites More sharing options...
MartMini Posted August 28, 2015 Report Share Posted August 28, 2015 I always found the holes they did in the hope tech levers felt horrible(even after i sanded mine down to try and smooth them out). i wrap mine in bandage tape for comfort/sweat absorption. Quote Link to comment Share on other sites More sharing options...
Mark W Posted August 30, 2015 Report Share Posted August 30, 2015 Which version of the Tech levers did you try? I agree about that on the older ones, but the Tech 3 levers feel pretty good Quote Link to comment Share on other sites More sharing options...
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