Brembo
Brembo 19RCS Corsa Corta Right Side Radial Brake Master Cylinder
Brembo 19RCS Corsa Corta Right Side Radial Brake Master Cylinder
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Brembo 19 RCS CORTA CORSA Adjustable Ratio Radial Brake Master Cylinder - Adjustable ratio 18/20 (19x18 or 19x20) - Forged body - Designed for 7/8" sportbike handlebars - For all custom bikes with 2 fixed 4 piston calipers WHAT PRESSURE DO YOU WANT? The new Brembo 19RCS CORSA CORTA also features the RCS(Ratio Click System) system introduced 10 years ago on the Brembo 19RCS radial master cylinder, which lets the rider select a fulcrum-to-piston distance of 18 or 20 mm by simply turning the adjuster screw on the front of the guide lever by 180° with a screwdriver.
The system uses a cam (red when set to 18 mm, black when set to 20 mm), which adjusts the distance between the fulcrum point and the contact point with the master cylinder push rod by 2 millimeters: this changes the distribution of the braking force without altering the performance of the system in terms of pure power. The innovative adjustment system introduced with the new Brembo 19RCS CORSA CORTA radial master cylinder contributes to a sense of total control over the bike by letting the rider tailor braking performance to suit their riding style, the weather and road conditions. A commitment to product improvement has allowed Brembo to offer three different master cylinders in one and to bring the performance of the braking system as a whole to another level. Combined, the choice of two fulcrum-to-piston measurements (18 and 20 mm) and three bite-point settings (R, S and N) offer a total of six different settings. MOTOGP SOLUTIONS The master cylinder housing is machined from forged aluminum with 5 axis CAM technology. The ultra-hard oxidized surface finish chosen for the master cylinder housing ensures outstanding wear resistance and extremely low friction between moving parts. The floating piston and gaskets are the same as the components used in MotoGP, as are the bleed and brake fluid delivery circuit couplings. These are inclined by over 30° to facilitate bleeding of the master cylinder.
The development of the 19RCS CORSA CORTA also included a design project to create a coherent style for all the components of the master cylinder itself, and as a result, the 19RCS CORSA CORTA has a distinct, dynamic and sporty look which is perfectly in keeping with the visual identity of the motorcycles for which it is intended (application for registered design/model submitted together with patent for the technology used). The lever assembly can be replaced without removing the RCS (Ratio Click System) system from the master cylinder and, therefore, without altering the settings made during assembly of the master cylinder in the Brembo Racing workshop.
Spare Parts Available.
110.C740.07 - Replacement Lever Pin
110.C740.88 - Bar Clamp with machined logo
110.C740.89 - Sticker and rubber cap kit
110.C740.98 - Replacement Half Lever
110.C740.99 - Replacement complete lever
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HAND BRAKE MASTERS EXPLAINED
The numbers refer to millimeters - the first number is the bore diameter size (area that pushes the fluid), the second number is the pivot distance between the pistons push rod center and the pivot center.
The main difference in master cylinder size as it relates to our use: - 19 and 20 mm masters are typically used to drive (2) four piston calipers - 16mm are typically used on a single four piston caliper (some bikes only have 1 disc) - 13mm is typically used on a one or two piston caliper This is due to the amount of fluid that the master's bore is designed to move to the calipers.
What does this mean to us? well, for handbrake purposes, you would match the master size to the handbrake caliper size as appropriate or choose a different size based on the feel that you are looking for. i.e. A Large master used on a small caliper will have a very hard feel with little lever travel as it is trying to move a lot of fluid and has nowhere to move it to. Conversely, if you used a 13mm master with a four piston caliper, you will have a very soft lever with lots of travel (which some may like better as its more variable control).
When talking about the 'feel' of the brake system, the key to the whole issue is the master cylinder piston size. - Smaller will give higher psi at the calipers, but will have more lever travel. - Same size will do the same psi as your input. - Larger will have less psi at the calipers with less lever travel, so to get equal power you have to squeeze harder. The lever ratio will play a factor too. The length of the lever from the pivot to the plunger rod as compared to the length of the lever where it is gripped will make a difference too.
Simple sizing explanation: Basically the master holds a certain amount of fluid and the caliper does as well. If that amount doesn't match it will change the feel of the lever. So if the master holds a lot and the caliper hold a lot less, when you squeeze the lever, it tries to move a lot of fluid with no where for it to go so the lever moves a small amount and gets hard fast and requires more pull effort from your hand. If the master is smaller than the caliper fluid capacity the opposite occurs where you have a lot of lever travel to move enough fluid to fill the caliper.