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Brembo GP4-RB High Performance Front Brake Caliper

P4 30/34mm | Billet 2-Piece | 108mm Radial Mount | Hard Anodized Black

Right Side Caliper | Part Number: 120B47341

The Brembo GP4-RB 120B47341 is a premium racing-derived right-side radial brake caliper engineered for riders demanding exceptional braking precision, outstanding modulation, and true factory superbike aesthetics. Manufactured from CNC-machined billet aluminum and finished in hard anodized black with Brembo’s signature red logo, the GP4-RB combines lightweight construction, superior rigidity, and MotoGP-inspired braking technology for aggressive street riding and track use.

Developed as part of Brembo’s prestigious Upgrade Line, the GP4-RB is designed specifically for motorcycles utilizing 108mm radial mount spacing and delivers race-level braking consistency and rider confidence under the most demanding riding conditions.

Item Summary

• Genuine Brembo GP4-RB front brake caliper
• Brembo Part Number: 120B47341
• RIGHT side caliper
• CNC billet aluminum 2-piece construction
• 108mm radial mount spacing
• 4 aluminum pistons
• Differentiated piston sizing: 30mm / 34mm
• Hard anodized black finish
• Glossy red Brembo logo
• Brembo Upgrade Line product
• Brembo brake pads included
• Compatible with 32–34mm disc height
• Lightweight high-rigidity racing design
• Designed for aggressive street and track riding
• Manufactured in Italy

Billet Racing Construction

The Brembo GP4-RB is precision-machined from billet aluminum using advanced CNC manufacturing processes developed directly from Brembo’s racing experience. Compared to traditional cast calipers, the billet 2-piece body delivers significantly greater structural rigidity and improved hydraulic consistency during aggressive braking situations.

The rigid billet architecture improves:

• Braking precision
• Lever feel
• Modulation accuracy
• Rider confidence
• Resistance to flex under heavy braking

The GP4-RB was developed specifically for riders seeking a true racing braking experience combined with premium Brembo craftsmanship.

Advanced 30/34mm Differential Piston Layout

The GP4-RB utilizes Brembo’s differentiated piston configuration featuring:

• 2 × 30mm pistons
• 2 × 34mm pistons

This staggered piston arrangement improves pressure distribution across the brake pads while enhancing braking feel and controllability. The aluminum pistons help reduce weight and improve thermal stability during repeated high-load braking cycles.

Performance Benefits

• Strong braking power
• Progressive lever feel
• Improved modulation
• Better rider feedback
• Consistent braking performance

Hard Anodized Racing Finish

The GP4-RB features a premium hard anodized black finish that enhances durability and corrosion resistance while creating an aggressive factory superbike appearance. Brembo’s signature red logo completes the caliper’s unmistakable motorsport styling.

Finish Benefits

• Enhanced corrosion resistance
• Increased surface durability
• Long-lasting racing appearance
• Premium superbike aesthetics

Technical Specifications

Included In The Box

• Brembo GP4-RB right-side caliper
• Brembo sintered brake pads
• Anti-vibration spring hardware
• Brembo installation documentation

Key Features

CNC Billet Aluminum Construction

Precision-machined billet body delivers exceptional rigidity and race-level braking feel.

Differentiated Piston Technology

30/34mm piston layout improves braking pressure distribution and modulation characteristics.

Racing-Derived Brembo Engineering

Developed using Brembo’s extensive MotoGP and World Superbike experience.

Lightweight High-Performance Design

Reduced weight improves front-end response and braking precision.

Premium Racing Appearance

Hard anodized black finish with red Brembo logo creates authentic factory racing aesthetics.

Compatible Brake Pads & Spare Parts

Genuine Brembo Compatible Pads

Replacement Components

Matching Caliper

The complete left/right GP4-RB caliper kit is sold under Brembo part number 220B47340.

Recommended Supporting Components

Recommended Brembo Master Cylinders

For optimal hydraulic leverage and braking performance, the GP4-RB is commonly paired with:

• Brembo 17RCS radial master cylinder
• Brembo RCS Corsa Corta master cylinder

These master cylinders maximize braking feel, modulation, and rider feedback.

Recommended Brake Rotors

Compatible with:

• OEM brake discs
• Brembo T-Drive rotors
• Brembo HPK racing rotors

Designed for approximately 5.5mm rotor thickness and 32–34mm disc height.

Important Fitment Notes

• Designed for motorcycles utilizing 108mm radial mount spacing
• RIGHT side caliper only
• Compatible with 32–34mm disc height
• Some motorcycles require spacers and longer mounting bolts
• Professional installation strongly recommended
• Brake system must be properly bled after installation
• ABS compatibility varies by motorcycle application

Why Choose the Brembo GP4-RB 120B47341?

The Brembo GP4-RB combines race-derived billet construction, advanced differentiated piston technology, and premium Brembo styling into one of the most desirable radial brake calipers available for modern sportbikes. Designed to maximize braking precision, rigidity, and rider control, the GP4-RB delivers exceptional performance for riders demanding a true racing feel on both the street and track.

Key Advantages

• CNC billet aluminum construction
• Exceptional braking rigidity
• Outstanding lever feel and modulation
• Race-derived Brembo technology
• Lightweight high-performance design
• Premium hard anodized finish
• Compatible with Brembo racing pad compounds
• Genuine Italian Brembo engineering

For riders building a premium superbike braking system or upgrading their motorcycle with authentic racing technology, the Brembo GP4-RB 120B47341 delivers elite-level braking performance with unmistakable Brembo pedigree.