🏍️ BREMBO 15RCS RADIAL CLUTCH MASTER CYLINDER 110A26350 – FOLDING LONG LEVER KBA-ABE CERTIFIED GENUINE ITALY

Every rider with a hydraulic clutch knows the feeling: the OEM clutch lever pulls heavy, the engagement point is vague, and after fifty kilometers of stop-and-go traffic your left hand is numb. The stock clutch master cylinder is designed for function — it does the job, but it gives you no control over how the clutch feels. Same lever pull whether you are filtering through city traffic or pushing through mountain switchbacks.

The Brembo RCS 15RCS (110A26350) is a radial clutch master cylinder from the Upgrade line — Brembo's highest-tier aftermarket offering. The 15mm piston provides hydraulic pressure suited for most motorcycles with hydraulic clutch actuation. Brembo's patented RCS (Racing Corsa Stradale) system lets you switch the lever ratio between 16mm and 18mm with a single 180-degree turn of a flat-blade screwdriver. 16mm for a light, progressive pull — comfortable in traffic. 18mm for a shorter, more direct engagement — snappier shifts on track. Forged aluminium body, folding long lever. This SKU carries KBA-ABE certification (TÜV approved) — street-legal throughout the EU.

⚙️ TECHNICAL SPECIFICATIONS & CONFIGURATION – BREMBO RCS 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 on the handlebar: The 110A26350 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 110A26350 (RCS, 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.

🌟 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.

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 (B.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 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.

🎯 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:

• 110A26365 – 14mm, RCS

• 110C74050 – 15mm, RCS Corsa Corta

💡 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. Or contact Monkey89 directly for technical advice.

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