Item Summary

Brembo GP4-RS High Performance Front Brake Caliper

About the Product

Brembo GP4-RS High Performance Front Brake Caliper

Cast Monobloc | 108mm Radial Mount | Titanium Grey | Left Side Caliper

Part Number: 120C78310

The Brembo GP4-RS 120C78310 is a MotoGP-inspired left-side radial brake caliper engineered for riders demanding lightweight construction, exceptional braking precision, and superior thermal management for aggressive street and track riding. Manufactured using Brembo’s advanced cast monobloc technology, the GP4-RS combines outstanding rigidity, optimized cooling performance, and race-level braking feel in a lightweight high-performance package.

Finished in Brembo’s titanium grey anodized coating with hand-painted red Brembo lettering, the GP4-RS delivers both factory racing aesthetics and cutting-edge braking performance for motorcycles utilizing 108mm radial mount spacing.

Item Summary

• Genuine Brembo GP4-RS front brake caliper
• Brembo Part Number: 120C78310
• LEFT side caliper
• Cast aluminum monobloc construction
• 108mm radial mount spacing
• 4 × 30mm aluminum pistons
• Titanium grey anodized finish
• Integrated piston cooling fin technology
• Lightweight high-rigidity design
• Brembo high-performance brake pads included
• Compatible with 32–34mm disc height
• MotoGP-derived braking technology
• Designed for aggressive street and track riding
• Brembo Upgrade Line product
• Manufactured in Italy

MotoGP-Derived GP4-RS Technology

The Brembo GP4-RS was developed using Brembo’s extensive MotoGP racing experience and advanced foundry casting techniques. Brembo engineered the GP4-RS specifically for riders wanting race-inspired braking performance combined with lightweight construction and exceptional thermal stability for high-performance road and track use.

Compared to the legendary Brembo M4 monobloc, the GP4-RS is approximately 10% lighter while improving cooling performance and maintaining excellent rigidity.

Benefits Include

• Improved braking precision
• Sharper lever feel
• Better thermal stability
• Reduced unsprung weight
• Enhanced braking consistency

Cast Monobloc Construction

The GP4-RS utilizes Brembo’s advanced cast monobloc construction technology, where the caliper body is manufactured as a single integrated structure. This significantly improves rigidity while minimizing weight and improving hydraulic precision during aggressive braking conditions.

Construction Advantages

• Exceptional rigidity
• Reduced caliper flex
• Improved braking consistency
• Better hydraulic feel
• Lower unsprung weight

The monobloc structure also contributes to excellent heat dissipation and long-term braking stability under repeated heavy braking cycles.

Advanced Cooling Fin Technology

One of the most distinctive features of the GP4-RS is its integrated cooling fin design around the pistons. Brembo developed these fins directly from MotoGP racing technology to improve airflow and thermal exchange during operation.

Cooling Benefits

• Improved heat dissipation
• Reduced brake fade
• More stable braking performance
• Increased thermal efficiency
• Better performance during extended track sessions

This advanced cooling system helps maintain consistent braking feel even under extreme thermal stress.

Optimized 30mm Piston Layout

The GP4-RS utilizes four 30mm aluminum pistons designed to provide a more progressive and controllable braking feel compared to larger piston calipers such as the M4. Brembo specifically optimized the GP4-RS for excellent modulation and compatibility with OEM and Brembo radial master cylinders.

Performance Benefits

• Excellent braking modulation
• Progressive lever feel
• Improved rider feedback
• Strong braking performance
• Enhanced controllability

The smaller piston configuration is especially beneficial for riders seeking improved lever sensitivity and precision during aggressive braking.

Technical Specifications

Included In The Box

• Brembo GP4-RS left-side caliper
• Brembo high-performance brake pads
• Pad anti-vibration spring
• Brembo thermotape temperature strips
• Brembo installation documentation

Key Features

Cast Monobloc Construction

Single-piece cast aluminum body improves rigidity and braking precision.

MotoGP-Derived Cooling Technology

Integrated cooling fins improve thermal exchange and braking consistency.

Lightweight High-Performance Design

Approximately 10% lighter than the Brembo M4 monobloc caliper.

Optimized 30mm Pistons

Smaller piston sizing improves lever feel and modulation characteristics.

Premium Brembo Racing Appearance

Titanium grey finish with hand-painted red Brembo logo creates authentic factory superbike styling.

Compatible Brake Pads & Spare Parts

Genuine Brembo Compatible Pads

Replacement Components

Matching Caliper

The complete GP4-RS left/right caliper kit is sold under Brembo part number 220C78310.

Recommended Supporting Components

Recommended Brembo Master Cylinders

For optimal hydraulic leverage and braking performance, Brembo commonly recommends:

• Brembo 17RCS
• Brembo RCS Corsa Corta

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

Recommended Brake Rotors

Compatible with:

• Brembo T-Drive rotors
• Brembo Serie Oro rotors
• Brembo HPK racing rotors
• High-performance OEM rotors

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

Important Fitment Notes

• Designed for motorcycles utilizing 108mm radial mount spacing
• LEFT side caliper only
• Compatible with 32–34mm disc height
• Not compatible with certain low-profile brake discs
• Some motorcycles may require spacers and longer mounting bolts
• Brembo notes that ABS compatibility varies by motorcycle application
• Professional installation strongly recommended

Why Choose the Brembo GP4-RS 120C78310?

The Brembo GP4-RS combines MotoGP-derived cooling technology, lightweight monobloc construction, and exceptional braking precision into one of the finest high-performance road and track calipers available for modern sportbikes. Designed for riders demanding outstanding modulation, reduced weight, and superior thermal stability, the GP4-RS delivers elite-level braking performance with unmistakable Brembo racing pedigree.

Key Advantages

• MotoGP-derived Brembo technology
• Cast monobloc construction
• Integrated cooling fin system
• Lightweight high-performance design
• Exceptional braking modulation
• Outstanding thermal stability
• Premium titanium grey racing finish
• Genuine Italian Brembo engineering

For riders upgrading to a true race-inspired braking system with factory superbike aesthetics and exceptional braking precision, the Brembo GP4-RS 120C78310 delivers world-class performance for both road and track use.