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  #1 (permalink)  
Old 05-21-2019, 08:17 AM
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Unhappy brake help

im sure this has been asked a million times butttt……….
so im running a jaybrake 9/16 front master cylinder with a single 4 piston Brembo caliper (30mm pistons). the thing is hard as a rock and takes everything I got to get even a little stopping. ive looked around online and everything says my ratio is off. maybe im looking in the wrong places but it seems all I can find is this same sizes and ratio. the dna front caliper is even a little smaller. any suggestions....this stuff aint cheap. is there a way to resleeve the master to bring it down to 1/2 inch.....
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Old 05-21-2019, 08:17 PM
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Typically when the master is too big the handle will be hard as a rock and the brakes act like they are pretty much off or on with no in between. Brembo brakes are weird though they use different bore sizes on the masters than other brands. I would try calling QTMi to see what size master they recomend. If I recall they used to offer a 15mm and 18mm when they sold hand controls.
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Old 05-22-2019, 03:43 PM
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well that's the thing. when u convert 9/16 to mm it is ~ 14.24 I looked at some wildwood calipers and their only ~32 mm piston (mine are 30mm) and yet they only sell a 5/8 master. I just don't want to buy another caliper and end up with the same issue. I think it odd that most everything I find says to use a 5/8 master. im getting my ratios from, "vintagebrake.com." am I misunderstanding it???
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