π§ How Brembo RCS Works β Visual Guide
π Ratio Click System (RCS)
At the pivot point of the lever, there's a small selector screw (often with a red and black insert) that lets you switch between two lever ratios:
Β
|
Setting |
Lever Ratio |
Effect |
Use Case |
|
18 |
18:1 |
Softer feel, more modulation |
Rainy conditions, touring |
|
20 |
20:1 |
Firmer feel, more immediate bite |
Dry roads, track, racing |
Β
πΈ You typically switch between 18 and 20 with a flat screwdriver β it takes seconds.
β Which Brembo RCS Model to Choose?
ποΈ Brake Master Cylinders:
Β
|
Model |
Piston Size |
Best For |
Bikes |
|
19RCS |
19mm |
Dual-disc front brakes (1000cc+) |
R1, CBR1000RR, ZX10R, GSX-R |
|
17RCS |
17mm |
Mid-size dual disc (~600β800cc) |
MT-09, CBR600RR, Z800 |
|
15RCS |
15mm |
Single-disc setup or smaller bikes |
KTM 390, dirt bikes, cafe racers |
Β
ποΈΒ Clutch Master Cylinders:
Β
|
Model |
Piston Size |
Best For |
Bikes |
|
16RCS |
16mm |
Hydraulic clutch systems |
Any sportbike with hydro clutch |
|
14RCS / 15RCS |
14β15mm |
Smaller clutch cylinders |
Lightweight bikes, cafe builds |
Β
π Visual Indicator: RCS Lever Selector
Most Brembo RCS master cylinders have this:
- π΄ Red dot = 18mm
- β« Black dot = 20mm
That small rotating selector controls how your lever pushes the piston β giving you a "soft feel" or a "hard bite" depending on your riding needs.
π Installation Notes
- You may need a specific reservoir kit, often sold separately.
- Banjo bolt is typically M10x1.0 β check your brake lines for compatibility.
- Requires DOT 4 brake fluid (not mineral oil).
- Bleeding required after install (use vacuum bleeder for best results).
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