Yeah, I've got the calculations written down for working out the optimum sizes. Probably buried in a notebook somewhere, not had to use it for ages.
Share here please as and when you come across your notes again ;-) (....and Marty repost the US site info please;-)
ducati.org forum | the home for ducati owners and enthusiasts > Superbike Model Specific > 916/996/998/748 Start here [this is universal law for all brakes/bikes]: The larger the bore of the master cylinder used with a set of calipers, the less lever movement needed and the greater lever force needed to achieve a given deceleration of the bike. Taken to an extreme the lever feels “wooden”. Conversely, the smaller the bore of the master cylinder used with a set of calipers, the more lever movement needed and the less lever force needed to achieve a given deceleration of the bike. Taken to an extreme the lever feels “soft”. Good modulation characteristics strike a balance between these two lever feels. Here are the modulation characteristics for a range of caliper piston area: master cylinder piston area ratios. Soft feel — 30:1 Best feel — 27:1 Firm feel — 23:1 Wooden feel — 20:1 For example, the rider with the 996R having 34/34 calipers and using a 1098 19 mm diameter master cylinder experienced a 7263:283.5 or a 25.6:1 ratio — quite nice. On a 996 with 30/34 caliper the 1098 MC produces a 6459:283.5 or a 22.7:1 ratio. Stock 996 is 6459:201.6 = 32:1. An overly soft feel on a street bike is Ducati erring on the side of rider safety and to reduce lock-ups during emergency braking. A 749/999, Brembo 19x18, or Hypermotard 18 mm master cylinder on a 996 with stock calipers will give you a 6459/254.5 = 25.4:1 — the same ratio that the 996R rider has.
Upgrading to m4 calipers on 2014 Skyhook Are the brake hose lengths the same as for earlier model by John W Any help much appreciated
Great.. thanks for the help, will get new hoses ordered. Hoping new calipers and pads will be an improvement but suspect it's only a part of the journey Thx R
Just to be absolutely clear (since we are discussing the M4 100mm upgrade) the pads listed above are NOT the ones for your new front end. This is Federal Mogul - Racing & Motorcycle Division Online Catalogue (ROAD USE) .
Sorry to bump this thread. I've just measured my existing brake line (the one from MC to LH caliper) and I'm getting a measurement of 1150mm instead of the ~1800mm I'm reading earlier in the thread. How come there's such a big difference? I've followed the line with string and make sure it's close all the way down the line. Just about to order the lines from HEL to fit my M4's and wanted to make sure I wasn't doing something wrong. (New here btw, Hi! Bike is a 2011 base model) Thanks, Mark
Thread resurrection! I'm thinking of changing to different calipers too BUT I'm considering another route and I would like your feedback. During my years with Aprilia bikes (particulary with a RSV 1000R Factory), I was very pleased with the brembo calipers with 4 pads that the bike had. These calipers are also used in Triumph speed triples (2008 and onward). The extra benefit is that the brake hose holes are in the same angle on the body of the calipers so no need to change brake lines too. Has anyone gone with that direction and want to share his thoughts?
