Brembo 17RCS Radial Brake Master Cylinder | 110A26340
Over the past two years, first in MotoGP and then on SuperSport street motorcycles, Brembo has introduced new radial calipers with a smaller piston diameter.
The last generation calipers have a much higher modulability than the larger pistons calipers, reducing braking distances in the straight and increasing speed along corners, so far you can also brake along the first part of the corner and when you stop braking the load transfer between front and rear is smoother.
The motorcycles that have benefited immediately are the Ducati Panigale with Brembo M50 calipers and Aprilia RSV4 with M430 calipers .
Along with these calipers a different master cylinder is required, , that's why Brembo has introduced the 17RCS .
The 17RCS then arises halfway between the 15RCS and 19RCS sharing the possibility of variation of the fulcrum common to the entire range.
17 x 18 is the extremest set up, the shorter wheelbase is preferred by riders who like more power and excellent progressiveness, with a working stroke slightly shorter than the 17x20, the 17 x 20 is the "ready" set up, the longer the wheelbase is, the shorter lever runs, as well less power is transferred to the piston.
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.
MotoGP Floating Piston
The inner piston, seals, push rod are the same as the majority of the MotoGP and SBK riders use. Brake master cylinder carries out a crucial job during the braking and the usage of the MotoGP parts guarantee excellent performances in all usage conditions because of the very reduced manufacturing tolerances and of the very good smoothness.
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.
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.
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.
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.
Fits a M10x1,0 mm bajo adapter (normaly japan bikes has M10x1,25mm one). Oem axial master cylinder brakes hoses could not fit radial mc, we can supply specific brake hoses or the adaptor.
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