About the Product
Brembo GP4-RX High Performance Front Brake Caliper
CNC Billet 2-Piece | 100mm Radial Mount | Nickel Finish | Left Side Caliper
Part Number: 120B01020
The Brembo GP4-RX 120B01020 is a premium MotoGP-derived left-side radial brake caliper engineered for riders demanding uncompromising braking precision, exceptional rigidity, and elite-level hydraulic performance for aggressive street and track riding. Manufactured entirely from CNC-machined billet aluminum and finished in Brembo’s signature nickel-plated MotoGP surface treatment, the GP4-RX combines race-proven technology with advanced braking modulation and factory superbike aesthetics.
Developed as part of Brembo’s prestigious Upgrade Line, the GP4-RX utilizes a lightweight 2-piece billet construction with four 32mm aluminum pistons and reinforcement ribs specifically engineered to maximize stiffness, braking consistency, and rider confidence under extreme braking conditions.
Item Summary
- Genuine Brembo GP4-RX front brake caliper
- Brembo Part Number: 120B01020
- LEFT side caliper
- CNC billet aluminum 2-piece construction
- 100mm radial mount spacing
- 4 × 32mm aluminum pistons
- Nickel-plated MotoGP-inspired finish
- Triple bridge reinforcement design
- Hand-painted Brembo logo
- Brembo Upgrade Line product
- Brembo sintered brake pads included
- Compatible with 32–34mm disc height
- Lightweight high-rigidity racing design
- Designed for aggressive street and track riding
- Manufactured in Italy
MotoGP-Derived Brembo Engineering
The Brembo GP4-RX was developed directly from Brembo’s extensive MotoGP and World Superbike racing experience. The caliper body is machined entirely from billet aluminum and constructed using two mechanically connected sections designed to maximize rigidity and braking precision.
Brembo engineers specifically focused on:
- Increasing caliper stiffness
- Improving braking power
- Enhancing modulation
- Improving thermal stability
- Maximizing rider feedback
The result is one of Brembo’s most respected high-performance billet radial calipers for modern sportbikes and premium custom builds.
CNC Billet Aluminum 2-Piece Construction
The GP4-RX is precision-machined from billet aluminum using advanced metalworking technology derived directly from racing competition. Compared to conventional cast calipers, the billet construction provides substantially improved rigidity and hydraulic consistency during aggressive braking.
The reinforced triple-bridge architecture helps minimize flex while improving braking precision and lever feel.
Construction Benefits
- Exceptional rigidity
- Reduced caliper flex
- Improved hydraulic precision
- Better rider feedback
- Enhanced braking consistency
- Lightweight racing performance
Advanced 4 × 32mm Piston Layout
The GP4-RX utilizes four lightweight 32mm aluminum pistons optimized to provide exceptional braking power with smooth and progressive modulation. Brembo specifically fine-tuned the hydraulics to maximize both stopping performance and rider controllability.
Performance Benefits
- Exceptional braking power
- Progressive lever feel
- Outstanding modulation
- Improved rider confidence
- Stable braking under high heat
The use of identical piston diameters also improves hydraulic consistency and braking predictability during aggressive riding conditions.
Premium Nickel MotoGP Finish
One of the defining features of the GP4-RX is its distinctive nickel-plated surface treatment derived directly from MotoGP racing applications. Brembo states the nickel coating refines already-tight machining tolerances while improving durability and operating precision.
Finish Benefits
- MotoGP-inspired appearance
- Enhanced corrosion resistance
- Improved durability
- Superior manufacturing precision
- Premium factory superbike aesthetics
The embossed Brembo logo is hand-painted in Brembo red for authentic factory racing styling.
Pinless Brake Pad Guide System
The GP4-RX incorporates integrated brake pad guides machined directly into the caliper body, eliminating traditional brake pad retaining pins. This advanced system improves pad stability while simplifying maintenance and enhancing aesthetics.
Advantages
- Cleaner racing appearance
- Improved pad stability
- Reduced hardware complexity
- Enhanced pad guidance
- Easier servicing
Technical Specifications
|
Specification |
Details |
|
Brand |
Brembo |
|
Model |
GP4-RX |
|
Part Number |
120B01020 |
|
Position |
Front Left |
|
Construction |
CNC Billet Aluminum 2-Piece |
|
Mount Type |
Radial Mount |
|
Mount Spacing |
100mm |
|
Offset |
30mm |
|
Pistons |
4 |
|
Piston Diameter |
32mm |
|
Piston Material |
Aluminum |
|
Disc Height Compatibility |
32–34mm |
|
Material |
Billet Aluminum |
|
Finish |
Nickel-Plated |
|
Hardware |
Steel |
|
Bridges |
Triple Bridge |
|
Brake Pads Included |
Yes |
|
Pad Shape |
C |
|
Weight Without Pads |
Approx. 1000g |
|
Brake Fluid |
DOT 4 |
|
Product Line |
Brembo Upgrade Line |
|
Made In |
Italy |
Included In The Box
- Brembo GP4-RX left-side caliper
- Brembo sintered brake pads
- Brembo banjo bolt
- Copper crush washers
- Brembo thermal temperature strips
- Brembo stickers
- Brembo installation manual
Key Features
CNC Billet Aluminum Construction
Precision-machined billet body provides exceptional rigidity and race-level braking precision.
MotoGP Nickel Finish
Nickel-plated surface treatment derived directly from MotoGP racing technology.
Triple Bridge Reinforcement Design
Advanced reinforcement ribs improve caliper stiffness and braking consistency.
4 × 32mm Pistons
Identical piston sizing improves braking power and modulation characteristics.
Race-Inspired Pad Guide System
Integrated brake pad guides eliminate traditional retaining pins.
Compatible Brake Pads & Spare Parts
Genuine Brembo Compatible Pads
|
Pad Compound |
Part Number |
Intended Use |
|
Brembo OE Sintered Pads |
107988210 |
Street / Track |
|
Brembo Z03 Endurance Pads |
107A48669 |
Endurance Racing |
|
Brembo Z04 Racing Pads |
107A48639 |
Professional Racing |
Replacement Components
|
Spare Part |
Description |
|
Bleed Screw Cover |
Brembo OEM replacement |
|
Bleeding Screw |
Brembo replacement bleed screw |
|
Spring Plate |
Brembo anti-vibration spring |
|
Pressure Seals |
Brembo seal kit |
|
Dust Seals |
Brembo dust seals |
|
Pistons |
Brembo replacement pistons |
|
Thermotapes 88–127°C |
Brembo thermal strips |
|
Thermotapes 132–171°C |
Brembo thermal strips |
Matching Caliper
|
Side |
Part Number |
|
Right Caliper |
120B01021 |
The complete GP4-RX left/right caliper kit is sold under Brembo part number 220B01020.
Recommended Supporting Components
Recommended Brembo Master Cylinders
For optimal hydraulic leverage and braking performance, Brembo commonly recommends:
- Brembo 19RCS
- Brembo 19x18
- Brembo RCS Corsa Corta
⚠️ Brembo specifically notes that OEM Ducati Panigale master cylinders should NOT be used with GP4-RX calipers.
Recommended Brake Rotors
Compatible with:
- OEM Brembo rotors
- Brembo SuperSport rotors
- Brembo T-Drive rotors
Designed for approximately 5.5mm rotor thickness and 32–34mm disc height.
Important Fitment Notes
- Designed for motorcycles utilizing 100mm radial mount spacing
- LEFT side caliper only
- Compatible with 32–34mm disc height
- Not compatible with low-profile brake discs
- Some motorcycles may require custom brake lines
- ABS compatibility varies by motorcycle application
- Professional installation strongly recommended
Why Choose the Brembo GP4-RX 120B01020?
The Brembo GP4-RX combines MotoGP-derived billet construction, advanced reinforcement technology, and elite-level braking precision into one of the finest radial brake calipers available for modern sportbikes. Designed for riders demanding exceptional braking feel, maximum rigidity, and factory racing aesthetics, the GP4-RX delivers uncompromising performance for both road and track use.
Key Advantages
- CNC billet aluminum construction
- MotoGP-derived nickel finish
- Triple bridge reinforcement design
- Exceptional braking precision
- Outstanding modulation and lever feel
- Lightweight racing architecture
- Premium factory superbike aesthetics
- Genuine Italian Brembo engineering
For riders upgrading to a true race-inspired braking system with elite-level performance and unmistakable Brembo pedigree, the Brembo GP4-RX 120B01020 delivers world-class braking technology engineered directly from MotoGP experience.
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