About the Product

Brembo GP4-MS High Performance Front Brake Caliper

CNC Billet Monobloc | 108mm Radial Mount | Nickel Finish | Left Side Caliper

Part Number: 120D60030

The Brembo GP4-MS 120D60030 is an elite-level MotoGP-derived left-side radial brake caliper engineered for riders demanding uncompromising braking performance, exceptional thermal stability, and race-level hydraulic precision. Manufactured from a solid billet of aluminum using advanced CNC machining and monobloc construction technology, the GP4-MS delivers extraordinary rigidity, lightweight performance, and braking consistency for aggressive street and track riding.

Finished in Brembo’s distinctive nickel-plated racing surface with integrated cooling fins and advanced MotoGP-inspired architecture, the GP4-MS represents one of Brembo’s most technologically advanced road-use brake calipers ever produced.

Item Summary

• Genuine Brembo GP4-MS front brake caliper
• Brembo Part Number: 120D60030
• LEFT side caliper
• CNC billet aluminum monobloc construction
• 108mm radial mount spacing
• 4 × 30mm pistons
• Nickel-plated MotoGP-style finish
• Integrated ventilation cooling fins
• MotoGP-derived braking technology
• Lightweight high-rigidity design
• Brembo brake pads included
• Compatible with 34mm braking band
• Designed for aggressive street and track riding
• Brembo Upgrade Line product
• Manufactured in Italy

MotoGP-Derived Brembo Engineering

The Brembo GP4-MS was developed directly from the monobloc brake calipers used in MotoGP competition and adapted specifically for high-performance road and track motorcycles. Brembo combines monobloc architecture with machining from solid billet aluminum to maximize rigidity, thermal resistance, and braking precision.

Compared to traditional cast calipers, the billet monobloc construction allows Brembo to utilize aluminum with superior mechanical characteristics and improved resistance to high operating temperatures.

This advanced construction improves:

• Braking consistency
• Lever feel
• Hydraulic precision
• Thermal stability
• Rider confidence under extreme braking

CNC Billet Monobloc Construction

Unlike conventional two-piece calipers, the GP4-MS uses a single-piece monobloc body precision-machined from solid billet aluminum. This dramatically improves structural rigidity while reducing flex under aggressive braking loads.

Construction Advantages

• Exceptional rigidity
• Reduced unsprung weight
• Improved braking precision
• Better thermal stability
• Enhanced hydraulic consistency

The monobloc billet structure allows the GP4-MS to achieve braking performance approaching that of Brembo’s professional racing calipers used in top-level motorcycle competition.

Advanced 30mm Piston Layout

The GP4-MS utilizes four 30mm pistons engineered specifically to maximize braking power while maintaining excellent modulation and controllability. Brembo states the piston configuration “rewrites the rules for road-use calipers” by nearly matching the performance of competition-level systems.

Performance Benefits

• Exceptional stopping power
• Progressive lever feel
• Improved modulation
• Enhanced rider feedback
• Consistent braking under extreme heat

The pistons are optimized to maintain stable hydraulic performance during repeated heavy braking cycles on both road and track.

Integrated Cooling Fin Technology

The GP4-MS incorporates advanced external ventilation fins integrated directly into the caliper body. These cooling fins improve thermal exchange and airflow around the caliper during operation, helping reduce operating temperatures and improve fade resistance.

Cooling Benefits

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

Premium Nickel Racing Finish

The GP4-MS features Brembo’s premium nickel-plated finish inspired directly by MotoGP competition hardware. The nickel coating enhances corrosion resistance while providing a distinctive factory racing appearance.

Finish Benefits

• Premium MotoGP appearance
• Enhanced corrosion resistance
• Improved durability
• High-end factory superbike aesthetics

Technical Specifications

Included In The Box

• Brembo GP4-MS left-side caliper
• Brembo brake pads
• Brembo installation documentation
• Brembo racing packaging

Key Features

CNC Billet Monobloc Construction

Single-piece billet body delivers exceptional rigidity and race-level braking precision.

MotoGP-Derived Brembo Technology

Developed directly from Brembo’s MotoGP racing experience.

Integrated Cooling Fins

Advanced ventilation fins improve thermal exchange and braking consistency.

Premium Nickel Finish

MotoGP-inspired nickel-plated coating creates an authentic factory racing appearance.

Race-Level Modulation

Four 30mm pistons provide exceptional braking control and rider feedback.

Compatible Brake Pads & Spare Parts

Genuine Brembo Compatible Pads

Replacement Components

Matching Caliper

The complete GP4-MS left/right kit is sold under Brembo part number 220D60030.

Recommended Supporting Components

Recommended Brembo Master Cylinders

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

• Brembo 17RCS
• Brembo 19RCS
• Brembo RCS Corsa Corta

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

Recommended Brake Rotors

Compatible with:

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

Designed for motorcycles utilizing 34mm braking band height.

Important Fitment Notes

• Designed for motorcycles utilizing 108mm radial mount spacing
• LEFT side caliper only
• Compatible with 34mm braking band height
• Some applications may 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-MS 120D60030?

The Brembo GP4-MS represents one of the closest braking systems available to true MotoGP technology for road motorcycles. Combining billet monobloc construction, advanced cooling fin technology, premium nickel finish, and exceptional hydraulic precision, the GP4-MS delivers elite-level braking performance for riders demanding the very best.

Key Advantages

• MotoGP-derived Brembo technology
• CNC billet monobloc construction
• Integrated cooling fin system
• Exceptional braking precision
• Outstanding thermal stability
• Premium nickel racing finish
• Lightweight high-performance design
• Genuine Italian Brembo engineering

For riders building the ultimate superbike braking system or upgrading to one of Brembo’s most advanced MotoGP-inspired calipers, the Brembo GP4-MS 120D60030 delivers uncompromising braking performance with unmistakable factory racing pedigree.