Brembo Racing CNC P4 34/38 Monoblock Brake Caliper Left 108mm XA3J7F0

Homologated for Moto2, WorldSBK and BSB competition, the Brembo Racing CNC P4 34/38 Monoblock Brake Caliper (XA3J7F0) represents the absolute ceiling of racing brake technology. Built for riders who refuse any compromise at the limit, this left-hand caliper delivers the combination of structural rigidity, titanium piston heat management and hydraulic precision that circuit racing demands.

Key Features

• CNC-machined monoblock construction eliminates flex for consistent, repeatable stopping power under sustained race loads
• Four titanium pistons — 2x 34 mm and 2x 38 mm — minimise heat transfer to the brake fluid for fade-free performance session after session
• 30 mm pad contact track maximises friction area and braking force at maximum deceleration
• 22.5 mm offset ensures precise disc alignment and correct pad presentation across a wide range of race machinery
• Nickel-plated exterior resists corrosion and the visual wear of track environments while preserving the caliper's structural integrity over a long service life
• Race-proven across the highest levels of international competition — the same specification trusted by WorldSBK and Moto2 teams worldwide

Race-Grade Construction

The monoblock design is not merely a marketing claim — it is the engineering foundation behind every elite Brembo Racing caliper. Machined from a single billet, the P4 34/38 has no join line across the bridge, which translates directly into a stiffer housing and a more direct pedal or lever feel. The central bridge provides an additional stiffening axis, ensuring that caliper body distortion under peak braking load remains negligible, a quality that becomes decisive when the difference between a safe late-braking point and a crash is measured in centimetres.

The titanium pistons are a safety-critical upgrade over steel alternatives. Titanium's low thermal conductivity keeps heat inside the disc and pad interface rather than migrating into the hydraulic circuit. Sustained high-temperature braking — precisely the condition found in long WorldSBK or BSB races — is where this caliper proves its safety credentials most clearly.

Performance on Circuit

Caliper stiffness is the primary determinant of modulation quality, and the CNC monoblock P4 34/38 delivers a lever feel that allows riders to place braking markers with confidence lap after lap. The nickel-plate finish protects the aluminium body without adding unnecessary mass, keeping unsprung weight as low as possible — a tangible benefit on the front axle where gyroscopic and inertial forces are most significant.

Important Safety Notice

This caliper is manufactured exclusively for closed-circuit competition use. It is not approved or intended for road use. Fitment requires a fork with a 108 mm mounting hole spacing — verify your fork specification before ordering. Brake pads are not included and must be ordered separately.

Fitment and Compatibility

The XA3J7F0 is compatible with a wide range of race and road-homologated motorcycles equipped with forks carrying a 108 mm caliper mount spacing, including models from Aprilia, BMW, Ducati, Honda, Kawasaki, KTM, MV Agusta, Suzuki, Triumph and Yamaha. Representative fitments include:

• Aprilia RSV4 / RSV4 R / RSV4 RR / RSV4 RF / RSV4 1100 / RSV4 1100 Factory / RS 660 / RS 457
• BMW S1000RR / M1000RR / HP4 / HP4R
• Ducati 848 / 899 / 959 / 1199 / 1199 S / 1199 R / 1299 / 1299 S / V4 / V4 S / V4 R
• Honda CBR 600 RR / CBR 1000 RR / CBR 1000 RR-R
• Kawasaki ZX-6R / ZX-10 R / ZX-10 RR / ZX-4 RR / Ninja 400
• KTM RC 390 / RC8 1190 / 990 RC R
• MV Agusta F3 / F4
• Suzuki GSX-R 600 / GSX-R 750 / GSX-R 1000
• Triumph Daytona 675 / Daytona 675 R / Daytona 765 / Daytona 765 Moto 2 / Street Triple 765 R / Street Triple 765 RS
• Yamaha R1 / R1M / R6 / R7 / R9 / R3

Always confirm the caliper mount pitch of your specific fork before installation. Year range coverage spans 2003 to 2026 across supported platforms.

Specifications

• Part number: XA3J7F0
• Piston configuration: 4 pistons — 2x 34 mm and 2x 38 mm
• Piston material: titanium
• Caliper body: CNC-machined monoblock aluminium
• Surface finish: nickel-plated
• Pad contact track: 30 mm
• Offset: 22.5 mm
• Fork mount spacing: 108 mm
• Side: left only
• Intended use: closed-circuit racing only — not for road use
• Brake pads: not included