Brembo Radial GP4-RS Monoblock Brake Caliper Kit 108mm – Race-Ready Stopping Power

Unveiled at EICMA 2016, the Brembo GP4-RS Monoblock Brake Caliper Kit represents the direct transfer of MotoGP braking technology to a production racing package. Compared to the already-formidable M4 Monoblock, this 108mm radial kit cuts caliper weight by 10% through an advanced high-strength casting process while simultaneously stiffening the body — a combination that translates to sharper initial bite, more consistent feel under hard braking, and absolute resistance to fade deep into a braking zone.

Key Features

• 10% lighter than the M4 Monoblock thanks to a high-strength casting technique introduced at EICMA 2016 — stiffer body, less unsprung mass
• Winged piston surface technology delivers 30% more efficient heat dissipation, keeping brake fluid temperatures in check and eliminating fade on long race stints
• Four 30mm pistons in a monoblock aluminium body for uniform, progressive clamping force with no caliper flex under maximum load
• Compatible with DOT 4 and DOT 5.1 brake fluid for full flexibility in race preparation
• Supplied complete with high-performance sintered brake pads (07BB3793) — arrive at the paddock ready to bleed and go
• Fits a wide range of supersport and superbike platforms including CBR 600 RR, CBR 1000 RR, ZX-10R, GSX-R 1000/750/600, R1, R6 and more

MotoGP Engineering in a Race Kit

The GP4-RS is built around a single-piece monoblock caliper body machined to extremely tight tolerances. Where conventional calipers rely on bolted half-bodies, the monoblock construction eliminates the junction entirely, producing a torsionally rigid unit that transmits lever input directly to pad contact without deflection. The high-strength casting process Brembo developed for this caliper allows thinner walls at equivalent rigidity compared to the M4, which is precisely where the 10% weight saving is achieved.

The winged piston surface is the most visible departure from the M4 design. Each piston features circumferential fins that dramatically increase surface area inside the fluid bore, drawing heat away from the disc contact face 30% more effectively than a conventional flat-faced piston. On a race track where successive hard braking events can push caliper temperatures to extremes, this technology keeps the fluid sub-boiling and the pedal feel firm lap after lap.

Track Use and Fitment Notes

Part number 220C78310 is a race-use-only component. It is not road-legal and carries no type approval (ABE). It is designed for competitive track use, trackdays, and circuit racing exclusively. The 108mm radial mounting pattern and 22.5mm offset are engineered to work with the brake disc dimensions listed below.

Compatible Spare Parts and Accessories

• Pad retaining spring plate: part number 120225579
• Bleed screw: part number 05338752
• Bleed screw dust cap: part number 05150220

Fitment and Compatibility

The Brembo GP4-RS 108mm kit fits a broad range of current and recent supersport and superbike models using a 108mm radial caliper mount, including:

• Honda CBR 600 RR, CBR 1000 RR, CBR 1000 RR-R
• Kawasaki ZX-6R, ZX-10R, ZX-10RR
• Suzuki GSX-R 600, GSX-R 750, GSX-R 1000
• Yamaha R6, R1, R1M
• Ducati 848, 899, 959, 1199, 1199 S, 1199 R, 1299, 1299 S
• Aprilia RSV4, RSV4 R, RSV4 RF, RSV4 RR, RSV4 1100, RSV4 1100 Factory, RS 660, RS 457
• BMW S1000RR, HP4, HP4R, M1000RR
• Triumph Daytona 675, Daytona 675 R, Daytona 765, Street Triple 765 R, Street Triple 765 RS
• MV Agusta F3, F4
• KTM RC 390, RC8 1190
• Always verify the caliper offset, disc diameter and mounting pitch against your specific model year before fitting.

Specifications