Caliper, Left Side, P4 30/34mm, GP4-RB 2-Pin, Billet 2-Piece, 108mm Radial Mount, Hard-Anodized Black - 20C06090

Item Summary Old Part# XA5G632 Special order item only Pads included About the Product Brembo GP4-RB High Performance Front Brake Caliper Left Side 20C06090 P4 30/34mm | CNC Billet 2-Piece | 108mm Radial Mount | Hard Anodized Black Item Summary Genuine Brembo High Performance GP4-RB front brake caliper Brembo Part Number: 20C06090 Previous Part Number: XA5G632 Alternative/Newer Reference: 120B47340 Front LEFT side application CNC-machined billet aluminum, 2-piece construction Four-piston design with 30mm / 34mm differentiated pistons 108mm radial mounting configuration Hard anodized black finish Dual brake pad retaining pins HH sintered brake pads included Engineered for high-performance street and track applications About the Product Brembo GP4-RB High Performance Front Brake Caliper The Brembo GP4-RB 20C06090 is a premium, racing-derived front brake caliper designed for riders seeking exceptional braking performance, precise modulation, and consistent stopping power. Manufactured from CNC-machined billet aluminum, the GP4-RB features a rigid two-piece construction engineered to provide excellent structural integrity and responsive braking characteristics under demanding riding conditions. The caliper utilizes four differentiated pistons measuring 30mm and 34mm, providing controlled brake pad pressure distribution and progressive braking response. Finished in hard anodized black, the GP4-RB combines professional racing technology with an aggressive, premium appearance suitable for performance-oriented street motorcycles and dedicated track machines. Designed for motorcycles utilizing 108mm radial caliper mounting, this left-side caliper is an excellent upgrade for riders seeking Brembo's renowned braking performance and engineering quality. CNC Billet Aluminum Construction Unlike conventional cast brake calipers, the GP4-RB is precision-machined from high-quality aluminum billet. Its two-piece construction is engineered to maintain structural rigidity under heavy braking loads, helping minimize unwanted caliper flex and provide consistent braking feedback. Performance Benefits Improved caliper rigidity under braking loads Precise and responsive brake lever feel Consistent hydraulic pressure distribution Excellent braking modulation and rider feedback Durable construction for demanding applications Premium racing-derived design Differentiated 30mm / 34mm Piston Configuration The Brembo GP4-RB incorporates four pistons with differentiated diameters: 2 30mm pistons 2 34mm pistons This piston arrangement is designed to optimize brake pad pressure distribution and provide controlled, progressive braking performance. The aluminum piston construction contributes to the caliper's lightweight design while supporting consistent braking operation. Braking Characteristics Strong and predictable braking response Progressive braking modulation Precise lever feedback Controlled brake pad engagement Consistent performance during repeated braking Hard Anodized Black Finish The GP4-RB features a premium hard anodized black surface treatment designed to enhance durability and resistance to surface wear. The hard anodized finish also provides an aggressive factory racing appearance, making the caliper an excellent choice for custom superbike builds and high-performance motorcycle upgrades. Technical Specifications Specification Details Manufacturer Brembo Product Line Brembo High Performance Model GP4-RB Part Number 20C06090 Previous Part Number XA5G632 Position Front Left Construction CNC Billet Aluminum Caliper Design 2-Piece Number of Pistons 4 Piston Diameters 30mm / 34mm Mounting Type Radial Mounting Bolt Spacing 108mm Finish Hard Anodized Black Brake Pad Retention 2-Pin Brake Pads Included Yes HH Sintered Compatible Disc Thickness 5.05.5mm Friction Area 22.5cm Weight Approximately 1.03kg Recommended Master Cylinder Brembo 1918 or 1920 Brake Fluid DOT 4 High-Performance Braking Technology Developed using Brembo's extensive experience in professional motorcycle racing, the GP4-RB incorporates engineering principles intended to deliver precise braking control and excellent performance. The combination of billet aluminum construction, differentiated pistons, and high-performance brake pads makes this caliper an excellent option for riders seeking improved braking feel and consistency. Key Features Precision CNC-Machined Construction Billet aluminum construction provides excellent dimensional accuracy, rigidity, and durability. Four-Piston Braking System Differentiated 30mm and 34mm pistons help deliver controlled braking pressure and progressive modulation. 108mm Radial Mounting Designed for motorcycles utilizing 108mm radial caliper mounting configurations. High-Performance Brake Pads Supplied with HH sintered brake pads for strong friction performance and dependable braking response. Premium Hard Anodized Finish Durable black surface treatment provides enhanced protection and professional racing aesthetics. Compatible Brake Pads & Replacement Parts The GP4-RB is designed to accommodate compatible Brembo brake pads and service components. Replacement Components Brembo HH Sintered Brake Pads Brembo Brake Pad Retaining Pins Brembo Brake Pad Spring Brembo Pad Pin Kit Brembo Bleeder Components Replacement components should be verified against the specific caliper part number before ordering. Recommended Supporting Components For optimal braking system performance, the GP4-RB can be paired with compatible high-performance Brembo components. Recommended Brake Master Cylinders Brembo 1918 Radial Master Cylinder Brembo 1920 Radial Master Cylinder Compatible Brembo RCS Master Cylinders, subject to hydraulic configuration Recommended Brake Rotors Compatible OEM brake rotors Brembo High Performance Brake Rotors Brembo T-Drive Brake Rotors Brake rotor dimensions, offset, and thickness must be verified before installation. Motorcycle Compatibility Designed for motorcycles utilizing 108mm radial front brake caliper mounting. Potential applications include selected Honda, Kawasaki, Suzuki, Triumph, and Yamaha sport motorcycles. Important: A 108mm mounting configuration alone does not guarantee direct fitment. Brake rotor diameter, offset, caliper clearance, brake line connections, and mounting hardware must be verified for each motorcycle. Installation Notes This listing is for one LEFT-side front brake caliper. Brake pads are included. Confirm 108mm radial mounting compatibility before ordering. Verify brake rotor thickness, offset, and caliper positioning. Additional mounting hardware or spacers may be required. Use the manufacturer-specified brake fluid and installation procedures. Professional installation is strongly recommended. Why Choose Brembo? Brembo is a world leader in high-performance braking technology, supplying advanced braking systems for road motorcycles and professional motorsport applications. The GP4-RB represents a premium braking upgrade for riders demanding precise control, exceptional build quality, and a racing-inspired design. Whether upgrading a high-performance street motorcycle or preparing a dedicated track machine, the Brembo GP4-RB delivers the quality and engineering expected from one of the world's most respected braking manufacturers. Technical Information Piston Diameter: 30mm / 34mm Fixing: 108mm Material: Aluminium alloy - machined from billet Finishing: Hard anodised Weight: 1.03kg Disc Thickness: 5-5.5mm Friction Area: 22.5cm2 Brake Master Cylinder Size: 19x18 or 19x20 Brake Fluid: DOT4 Replacement Parts: HH Sinterd Pads Caliper Pin Pad Spring Pin Kit.