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Brembo 15RCS Brake Master Cylinder Shorty Lever
The Brembo 15RCS Master Cylinder is ideal for single caliper braking systems such as those found on supermotos and 250-500cc sportbikes. It features a radial configuration that yields a dramatic increase in stopping power and brake feel over the stock axial master cylinders.
The Brembo RCS Brake Master Cylinder allows the rider to choose between more power or more precision to best complement their riding style, track/street conditions and other brake components. The unique design of the RCS system offers the flexibility to change the brake lever ratio at the turn of a screw. The 20mm setting provides a more reactive braking response and the 18mm setting allows for better feel and modulation. Additionally, the Brembo lever features an adjustable thumb screw that can be customized to fit a range of riders’ hands. In the event of a crash the outer portion of the lever folds up and away to avoid damage. The patented master cylinder is constructed of forged aluminum and then CNC machined down to remove any excess weight. All of its components, including the piston, seals and pushrod, are the same as those used in MotoGP and WSBK.
- Forged aluminum body
- Hard anodized finish
- Adjustable and folding aluminum lever
- 15mm piston
- Lever ratio of 18mm and 20mm
- Weight: ~350 gr
- Brake fluid: DOT 4
- Mounts to most 22mm diameter handlebars
- Includes universal brake light switch
- Brembo Brake Reservoir Kit available (sold separately)
- Brembo Remote Adjuster available (sold separately)
- Compatible with most OEM ABS brake systems
Note: For street use Brembo includes a brake like switch harness that will replace your stock harness (requires cutting and splicing of stock harness).
Brembo Radial Master Cylinder has made the history of Racing Brake System, it's the most used MotoGP or SBK master cylinder and it is the market leader.
15RCS brake master cylinder is intended specifically for Naked and SuperMotard machines, the 15RCS master cylinder has all the technological features of the 19RCS - the M/C most popular with enthusiast - namely the Ratio Click System, the same component specifications as for MotoGP system, hard-anodized cylinder body, and folding lever. With the 15RCS, the user can change the lever pivot distance from 18mm to 20mm simply by turning the adjuster inside the cylinder. This brake M/C can be matched with the 16RCS clutch master cylinder, giving a set-up that will deliver MotoGP performance, as well as being a real attention-grabber.
19RCS , 17RCS, 15RCS, 14RCS ? These numbers identify piston diameter:
- 19RCS to be installed on twin disks bikes with axial or radial calipers but NOT on Floating Calipers
- 17RCS to be installed on twin disks bikes with axial or radial calipers whose pistons diameter is 32mm or lower, but NOT on Floating Calipers; for example Ducati Panigale or RSV4, Yamaha R6 etc etc.
- 15RCS to be used on twin disks braking system carrying floating calipers (Naked), and on single disk bikes (motard).
The 15 RCS with 15 x 20 set up works like a 16 x 18 mc, while 15 x 18 equals a 16 x 16 mc.
- 14RCS to be installed on single/twin disks Scooters and single disks Motorcycles (from 50cc up to 600cc) . Available both Right and Left Side.
Adjustable ratio: RCS system
This new patented device allows to modify the pump lever ratio on two values, 18 or 20 mm, by simply rotation of the eccentric drive placed on the front of the lever drive. By the RCS system – Ratio Click System – it is very easy to pass from one configuration to the other one, modifying the lever ratio to adjust it to the different characteristics of the braking system, of the usage and driving, such as, for ex., the wet or dry conditions, asphalt with more or less grip, circuit with strong braking.
This adjustment is the element missing till now to get the ideal feeling among the rider, the driving style, the bike and the circuit.
Master cylinder body
The master cylinder body is in aluminium alloy, produced by forging and then CNC (Computer Numerical Control) machined by lightening milling.
Very closed manufacturing tolerances, similar to those used in MotoGP, guarantee the perfect matching with the floating piston due to a working precision never seen. For the superficial finishing it has been chosen the hard anodizing, electrolytic process which converts the surface of aluminium and its alloys into a vary hard oxide coating which guarantees very high resistance to abrasion and corrosion.
The lever is made of two main components: the racing lever drive and the lever itself, folding and manufactured by forging. In the lever joint it has been inserted a patented system which allows the rotation only by the effect of an eventual tumble of the bike, without the possibility of an accidental rotation and getting in this way a bigger dynamic safety. The control for the lever distance adjustment from the handlebar has been re-placed and now it is in axis with the lever itself, guaranteeing the assembly of the eventual remote adjuster. By using this control, the press push rod does not move in respect to the master cylinder body, keeping the best working angle of the push rod. Therefore, either by getting the brake lever closer or farer to the handlebar, the efficiency of the kinematics motion does not change, assuring less friction and lack of scattered forces. In addition the lever has its fulcrum on the pump body by mean of a bushing/gauged pin system which guarantees high stiffness and better feeling together with a high resistance to wear.
15RCS is available in two different versions:
- 15RCS Short Lever : the lever is shorter then the lever used on 19RCS, also it is differently curved.
- 15RCS Long Lever : the lever is the same as 19RCS.
Please note we show pictures of 15RCS Short Lever only, if you want to check how it is the 15RCS Long Lever version, just browse 19RCS pictures.
A special housing has been designed for the rear stop light mechanic micro switch, for street usage of the master cylinder. The micro-switch is supplied in the same master cylinder package.
The switch works "normally open" when the lever rests; by pressing the lever it closes the circuit. The switch can not replace a switch that works "normally closed", such as BMW switches. You can purchase optional switch available in the linked products.
Lever contrast springs
High load springs have been chosen to guarantee the constant contact between the eccentric drive and the push rod; in this way you can avoid wear due to the knocking by the vibrations of the vehicle and an item of further safety is introduced in the transient phase between accelerator release and brake, resulting in an advantageous life increase of the various components.
Fits a M10 x 1.0 mm bajo adapter (normaly japan bikes has M10 x 1.25mm one).
Oem axial master cylinder brakes hoses could not fit radial mc, we can supply specific brake hoses or the adaptor.
Fitment Notes & Exceptions
- May not be compatible with OEM brake reservoir, Brembo Brake Reservoir Kit may be required for installation.
- Aftermarket brake line(s) may be required for installation. Please check your brake line fittings prior to installation.