The facts.
| 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 |
DescriptionThe whole story▼
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
What's includedEverything in the box▼
- 1x Brembo Racing CNC P4 34/38 Monoblock Brake Caliper Left (XA3J7F0)
FitmentWhich bikes this fits▼
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