🏍️ BREMBO 15RCS CORSA CORTA RADIAL CLUTCH MASTER CYLINDER 110C74050 – FOLDING LONG LEVER GENUINE ITALY

INTRODUCTION (Hook & Bridge)

The standard RCS clutch master cylinder offers two lever ratio settings — solved the "heavy pull" problem. But there is a second variable the standard RCS cannot adjust: where in the lever travel the clutch begins to engage. In traffic, you want a gradual engagement point for smooth low-speed maneuvering. On track, you want the clutch to bite the instant your fingers start releasing. Two different riding conditions, one fixed engagement point — that is the compromise.

The Brembo RCS Corsa Corta (110C74050) eliminates that compromise with two independent adjustment layers. Layer 1: RCS lever ratio system (16-18mm via screwdriver). Layer 2: N-S-R Bite Point selector (Normal – Sport – Race) on top of the cylinder body — adjusted by hand, no tools required. Combined: 6 distinct clutch configurations = 2 lever ratios x 3 engagement points. 15mm piston, forged aluminium body (F.AL), folding long lever. The same technology Brembo applies to MotoGP clutch master cylinders.

⚙️ TECHNICAL SPECIFICATIONS & CONFIGURATION – BREMBO RCS CORSA CORTA 15RCS GENUINE ITALY

🛠️ INSTALLATION GUIDE – CORRECT TECHNICAL PROCEDURE

1. Step 1 – Preparation: Remove the OEM clutch master cylinder, reservoir, and clutch line. Protect all painted surfaces — DOT 4 clutch fluid is extremely corrosive to paint on contact.

2. Step 2 – Mount the Brembo RCS Corsa Corta on the handlebar: The 110C74050 is designed for 22.2mm standard handlebars, mounted on the left side. Torque the handlebar clamp bolts to Brembo's specification — do not over-tighten, as this can deform the forged aluminium body.

3. Step 3 – Connect the clutch line: Install the banjo bolt to the fluid outlet port. Connect the clutch line to the clutch slave cylinder at the gearbox. Use the bleeder screw to purge all air from the system after filling with fresh DOT 4 fluid.

4. Step 4 – Bleed and verify: Bleed the entire clutch system until the lever feels solid with no sponginess. Verify that the clutch fully disengages when the lever is pulled to its stop — the bike should shift into first gear without jerking.

🚨 Critical installation notes:

• Never use solvents, gasoline, or thinners to clean the master cylinder body — use only water-based cleaners to avoid damaging internal rubber seals.

• All fluid ports must be capped during storage.

• Do not disassemble the master cylinder (piston, seals) — overhaul must be performed by Brembo.

• Use only genuine Brembo replacement parts.

• Replace the lever terminal immediately if it rotates loosely relative to the lever body.

• After installation, test clutch engagement and disengagement at multiple speeds before riding normally.

🎛️ RCS LEVER RATIO ADJUSTMENT – OFFICIAL BREMBO PROCEDURE

The 110C74050 (RCS Corsa Corta, type 16-18) allows switching the lever ratio between 16mm and 18mm. Identify the current setting by the push rod top face color:

8-step adjustment procedure (per official Brembo documentation):

1. Step 1: With the master cylinder mounted, observe the push rod top face color (point 3). Red = 16mm, Black = 18mm.

2. Step 2: Remove the rubber cap (point 4) from the lever body (point 2) by hand to expose the adjustment hole (point 5).

3. Step 3: Turn the lever-to-handlebar distance adjuster (point 6) fully counterclockwise to expose the adjustment slot inside the hole (point 7).

4. Step 4: If debris is present inside the adjustment hole, clean with a damp cloth. (⚠️ WARNING: Do not use compressed air).

5. Step 5: Use a flat-blade screwdriver with tip width 3mm MAX, 2mm MIN — the tip must maintain this width for a minimum length of 12mm. (⚠️ WARNING: Do not use a screwdriver outside these specifications. Brembo accepts no liability for damage caused by non-conforming tools).

6. Step 6: Insert the flat-blade screwdriver into the adjustment hole until it engages the slot. (⚠️ WARNING: Do not apply excessive force when turning or pressing — this can damage internal components).

7. Step 7: Rotate the screwdriver 180 degrees until you hear a "click" — confirming successful switching. Verify the push rod top face color (point 3).

8. Step 8: Replace the rubber cap (point 4). Adjust the lever-to-handlebar distance knob (point 6) to the preferred lever reach.

⚠️ CRITICAL WARNING: Lever ratio adjustment directly affects lever stroke and the force required to disengage the clutch.

Functional test (mandatory after every adjustment):

• Verify that the lever pivots freely and the clutch fully disengages at full lever stroke.

• Test gear shifts at low speed to confirm smooth clutch operation before riding at normal speed.

🎚️ BITE POINT ADJUSTMENT (IDLE STROKE) – CORSA CORTA EXCLUSIVE

In addition to the RCS lever ratio system (16-18mm), the RCS Corsa Corta clutch master cylinder features idle stroke adjustment — changing where in the lever travel the clutch begins to engage when the lever is released.

Identification: the cylinder body is engraved with "corsacorta". 3-position N-S-R selector located on top of the cylinder body, adjusted by turning the knob:

• N (Normal): Longest idle stroke — gradual clutch engagement, easy low-speed control. Suited for street riding, traffic.

• S (Sport): Medium idle stroke — balanced control and response. Suited for sport touring.

• R (Race): Shortest idle stroke — instant clutch engagement on lever release, fastest gear shifts. Suited for track riding.

💡 Combined: 2 lever ratios (16mm / 18mm) x 3 engagement positions (N / S / R) = 6 clutch configurations in one master cylinder.

⚠️ WARNING: Switching between R-S-N modes directly affects lever stroke and the force required to disengage the clutch. Always test clutch operation at low speed after each adjustment.

🌟 PERFORMANCE & TECHNOLOGY

RCS (Racing Corsa Stradale) – Brembo Patented System:

The eccentric locator mechanism allows switching the lever ratio between 16mm and 18mm using a flat-blade screwdriver, 180-degree rotation. At 18mm (black push rod face), clutch engagement is direct with a shorter lever stroke — suited for fast track shifts. At 16mm (red push rod face), the clutch action is progressive with a longer stroke — suited for comfortable street riding.

Bite Point Adjustment – Corsa Corta Technology:

The 3-position N-S-R selector (Normal – Sport – Race) on top of the cylinder body, combined with the RCS system, yields 6 distinct clutch configurations (2 lever ratios x 3 engagement points) — the highest adjustability available in the aftermarket clutch segment.

15mm Piston – clutch feel characteristics:

The 15mm piston provides fluid displacement suited for most hydraulic clutch systems across Ducati, Aprilia, KTM, BMW, and similar platforms. Balanced lever effort with a predictable engagement stroke.

Forged Aluminium Body (F.AL):

CNC-machined from a forged aluminium billet. Compared to cast aluminium, forging produces a finer, more uniform grain structure — higher rigidity at lower weight. Hard anodized surface treatment — the same process Brembo applies in MotoGP.

How does clutch feel change after the upgrade?

The RCS Corsa Corta 15RCS clutch master cylinder delivers markedly more linear clutch feel compared to the OEM unit. The rider can sense the exact clutch engagement and disengagement points — smoother gear shifts, less jerkiness, and significantly reduced hand fatigue. Especially valuable in stop-and-go traffic where the clutch lever is pulled hundreds of times per ride. The N-S-R selector adds engagement point customization for each riding condition — adjustability the standard RCS does not offer.

🎯 COMPATIBILITY & FITMENT

Per Brembo compatibility data, this SKU fits over 100 motorcycle models with hydraulic clutch systems, including brands: Aprilia, Ducati, KTM, BMW, Triumph, MV Agusta, Husqvarna, and more.

Fitment requirements:

• Motorcycle with hydraulic clutch system.

• Handlebar diameter: 22.2mm (standard).

• Compatible clutch slave cylinder at the gearbox.

Note: This is a Clutch master cylinder, not Brake. For brake master cylinders, refer to the RCS Brake line. Other RCS clutch variants:

• 110A26350 – 15mm, RCS

• 110A26365 – 14mm, RCS

💡 Not sure if this clutch master cylinder fits your bike? Use the compatibility lookup tool on the Monkey89 website — enter your bike brand, model, and year for an instant match. 

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