🏍️ BREMBO 15RCS CORSA CORTA RADIAL BRAKE MASTER CYLINDER 110C74020 – FOLDING SHORT LEVER SINGLE DISC GENUINE ITALY

For single-disc riders who want maximum adjustability in a compact package: the standard RCS lets you change lever ratio, but the point where the brake pads first engage the rotor remains fixed. On varying road surfaces — dry tarmac, wet cobblestones, gravel transitions — the ideal initial bite point changes. Having to accept a one-size-fits-all engagement point means the brake setup is always a compromise.

The Brembo RCS Corsa Corta 15RCS (110C74020) combines a short lever (169.6mm) with three-position bite point adjustment. 15mm piston for single-disc systems. N-S-R selector (Normal – Sport – Race) on the cylinder top plus RCS lever ratio adjustment (18-20mm). Six braking configurations total. Compact two-finger operation, forged aluminium (F.AL), hard anodized (HA). Note: no brake light micro-switch in the Corsa Corta kit — purchase separately for street use.

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

ATTRIBUTE	TECHNICAL SPECIFICATION
Brand	Brembo – Italy
SKU / Part Number	110C74020
Product Line	Upgrade – RCS Corsa Corta
Full Product Name	RCS Corsa Corta Forged Radial Brake Master Cylinder
Mounting Type	Radial – handlebar-mounted
Body Material	F.AL – Forged Aluminium
Surface Treatment	HA – Hard Anodized
Piston Bore	15mm
Lever Ratio	18 – 20mm – adjustable via RCS eccentric locator
Bite Point Adjustment	3-position N-S-R selector (Normal – Sport – Race) on cylinder top
Lever Type	SL – Short Lever (Folding)
Disc Configuration	Single Disc
Weight	500g
Overall Dimensions (L x H)	169.6mm x 143mm (from Brembo technical drawing dated 26.09.24)
Handlebar Bore	22.2mm (standard)
Brake Fluid	DOT 4
Brake Light Micro-switch	Not included (purchase separately for street use)
KBA-ABE Certification (TÜV)	No
Product Category	Radial Brake Master Cylinder
Classification	Aftermarket – Upgrade Line
Condition	Brand New 100% Full Box
Color	Black – Hard Anodized
EAN Barcode	8020584651360
Packaging Unit	1 set / box
Country of Origin	Italy – Brembo S.p.A.

📦 KIT CONTENTS

(per Brembo technical drawing dated 26.09.24)

🔩 GENUINE SPARE PARTS

⚠️ Note: Only genuine Brembo spare parts should be used — do not substitute third-party components.

🛠️ INSTALLATION GUIDE – CORRECT TECHNICAL PROCEDURE

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

2. Step 2 – Mount the Brembo RCS Corsa Corta on the handlebar: The 110C74020 is designed for 22.2mm standard handlebars. 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 brake line: Install the banjo bolt (included in kit) to the fluid outlet port. Use the bleeder screw to purge all air from the system after filling with fresh DOT 4 brake fluid.

4. Step 4 – Bleed and verify: Bleed the entire brake system until the lever feels solid with no sponginess.

⚠️ Important: The Corsa Corta kit does NOT include a brake light micro-switch. For street use, purchase a compatible micro-switch separately to ensure safety and legal compliance.

🚨 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.

🎛️ RCS LEVER RATIO ADJUSTMENT – OFFICIAL BREMBO PROCEDURE

The 110C74020 (RCS Corsa Corta, type 18-20) allows switching the lever ratio between 18mm and 20mm. 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 on the bike, observe the push rod top face color (point 3). Red = 18mm, Black = 20mm.

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

3. Step 3: Turn the lever-to-handlebar distance adjuster (point 6) fully counterclockwise to expose the adjustment slot (point 5) inside the hole (point 7).

4. Step 4: If debris is present inside the adjustment hole (point 5), clean with a damp cloth. (⚠️ WARNING: Do not use compressed air).

5. Step 5: Use a flat-blade screwdriver (point 8) with tip (point 9) 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 (point 8) into the adjustment hole (point 5) until it engages the slot (point 7). (⚠️ WARNING: Do not apply excessive force when turning or pressing the screwdriver — 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) matches the desired setting.

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 brake pressure required to stop the motorcycle.

Functional test (mandatory after every adjustment):

• Verify that the lever pivots freely and generates proper braking force. If the lever binds, increase lever-to-handlebar distance via the adjuster (point 6).

• Perform a braking test at low speed to confirm effective braking before riding at normal speed.

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

In addition to the RCS lever ratio system (18-20mm), the RCS Corsa Corta features idle stroke adjustment — changing where in the lever travel the brake pads first engage the rotor.

Identification: the cylinder body is engraved with "corsacorta" (point 10). 3-position N-S-R selector (point 11) located on top of the cylinder body, adjusted by turning the knob:

• N (Normal): Longest idle stroke — furthest bite point, gentle and progressive feel. Suited for street riding, wet surfaces.

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

• R (Race): Shortest idle stroke — nearest bite point, instant response. Suited for track riding.

💡 Combined: 2 lever ratios (18mm / 20mm) x 3 bite point positions (N / S / R) = 6 braking configurations in one master cylinder.

⚠️ WARNING: Switching between R-S-N modes directly affects lever stroke and the brake pressure required to stop the motorcycle. Always perform a low-speed braking test after each adjustment.

🌟 PERFORMANCE & TECHNOLOGY

RCS (Racing Corsa Stradale) – Brembo Patented System:

The core technology of the Upgrade line. An eccentric locator mechanism allows switching the lever ratio between 18mm and 20mm using a flat-blade screwdriver, 180-degree rotation — no disassembly required. At 20mm (black push rod face), the brake responds quickly with a short lever stroke — suited for track use. At 18mm (red push rod face), the brake is progressive and linear with a longer stroke — suited for street riding.

Bite Point Adjustment – Corsa Corta Technology:

The defining feature separating Corsa Corta from the standard RCS: a 3-position N-S-R selector (Normal – Sport – Race) on top of the cylinder body. Combined with the RCS system, this yields 6 distinct braking configurations (2 lever ratios x 3 bite points) — the highest adjustability available in the aftermarket segment.

15mm Piston – Optimized for single disc systems:

The 15mm piston provides fluid displacement matched to the piston travel of single-disc calipers. Per Brembo catalogue: "The 15RCS can be mounted on single-disc units with a 4-piston caliper, or twin-disc with floating type calipers."

SL – Short Lever:

The 110C74020 uses a short lever, overall length 169.6mm (vs. 195mm for the long lever variant). Suited for riders with smaller hands or those preferring compact two-finger operation (index + middle finger).

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. The surface receives hard anodized (HA) treatment — the same process Brembo applies in MotoGP and World Superbike.

How does braking feel change after the upgrade?

With the 15mm piston optimized for single disc, the RCS Corsa Corta 15RCS delivers markedly more linear brake feel compared to the OEM master cylinder. Finger input translates proportionally to caliper clamping force — the rider can sense the exact engagement point of the pads on the rotor, modulating brake intensity precisely without dead spots or abrupt grab. The N-S-R selector on the cylinder top adds further bite point refinement — a level of adjustability the standard RCS does not offer.

🎯 COMPATIBILITY & FITMENT

The Brembo RCS Corsa Corta 15RCS (110C74020) mounts on 22.2mm standard handlebars — compatible with most motorcycles.

Compatibility requirements:

• Motorcycle with single disc front brake system.

• Calipers: 4-piston for single disc, or floating-type for twin disc.

• Handlebar diameter: 22.2mm (standard).

Note: The 110C74020 is designed for single disc systems. For different disc configurations, see other Corsa Corta variants:

• 110C74010 – 19mm, Long Lever, Twin Disc

• 110C74030 – 15mm, Long Lever, Single Disc

• 110C74040 – 17mm, Long Lever, Twin Disc

💡 Not sure if this master cylinder fits your bike? Use the compatibility lookup tool on the Monkey89website — enter your bike brand, model, and year for an instant match. 

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