The facts.
| Part Number | XA3J7F1 |
|---|---|
| Piston Diameter | 2x 34 mm and 2x 38 mm |
| Number of Pistons | 4 |
| Piston Material | Titanium |
| Body Construction | CNC-machined monoblock |
| Pad Contact Width | 30 mm |
| Offset | 22.5 mm |
| Fork Bolt Spacing | 108 mm |
| Surface Finish | Nickel-plated |
| Side | Right only |
DescriptionThe whole story▼
The Brembo Racing CNC P4 34/38 Monoblock Brake Caliper Right 108mm (XA3J7F1) is the definitive race-bred braking solution for riders who demand absolute confidence at the limit. Machined from a single billet block and proven across Moto2, WorldSBK and BSB, it delivers a level of rigidity, modulation and heat management that no conventional caliper can match — putting the rider entirely in control, lap after lap.
Key Features
- CNC-machined monoblock body eliminates flex for direct, uncompromising braking force and immediate lever feedback on every braking zone
- Four titanium pistons (2x 34 mm and 2x 38 mm) manage heat transfer superbly, maintaining consistent pad contact and braking feel across extended track sessions
- Optimised hydraulic circuit with a 30 mm pad contact width delivers precise, linear modulation — exactly what is needed when braking from high speed into tight corners
- Central bridge design increases structural rigidity still further, translating greater braking stability and control on the most demanding circuits
- Nickel-plated finish resists corrosion and surface wear, preserving the caliper's integrity across seasons of intensive track use
- 22.5 mm offset ensures correct geometry and perfect pad-to-disc alignment when fitted to compatible forks
Race Pedigree and Performance
Every detail of the P4 34/38 has been shaped by Brembo's direct involvement in top-tier competition. This is the caliper specification trusted by professional riders in WorldSBK, the BSB championship and the Moto2 class — environments where braking performance is tested to its absolute limits every single session. The monoblock construction means there is no caliper-half interface to deflect under load; the entire structure responds as one, giving the rider a braking feel that is both precise and repeatable.
The titanium pistons are a key differentiator. Compared to aluminium equivalents, titanium conducts far less heat from the disc and pads into the hydraulic fluid, guarding against brake fade during sustained hard braking. Combined with the caliper's optimised internal fluid channels, the result is a system that performs as well on the final lap as it does on the first.
Build Quality and Finish
The nickel-plated surface treatment is not merely cosmetic. It provides a hard, corrosion-resistant barrier that protects the aluminium body from the combined assault of heat, brake fluid, and the environment typical of intense track use. The finish also simplifies cleaning and maintenance between sessions, keeping the caliper looking and performing as intended throughout its service life.
Fitment and Compatibility
This caliper is designed exclusively for forks with a 108 mm bolt spacing. It is a right-hand unit only. Please confirm your fork specification before ordering. This caliper is intended for racing and track use only — it is not approved for road use.
Compatible fitments include a wide range of performance and superbike platforms. The tags associated with this product list the following:
- Aprilia: RSV4, RSV4 R, RSV4 RF, RSV4 RR, RSV4 1100, RSV4 1100 Factory, RS 660, RS 457
- BMW: S1000RR, M1000RR, HP4, HP4R
- Bimota: KB998 Rimini
- CFMOTO / QJMotor: SKR 800 RR, V2 890, V2 955
- Ducati: 848, 899, 959, 1199, 1199 R, 1199 S, 1299, 1299 S, V4, V4 R, V4 S
- Honda: CBR 600 RR, CBR 1000 RR, CBR 1000 RR-R
- KTM: RC 390, RC8 1190, 990 RC R
- Kawasaki: Ninja 400, ZX-4 RR, ZX-6R, ZX-10 R, ZX-10 RR
- MV Agusta: F3, F4, 675 SR-R, 450 SR
- 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, R3, R6, R7, R9
Always verify the 108 mm fork bolt spacing on your specific machine and model year before fitting.
Important Notes
This caliper is for race and track use only. It is not homologated for road use. Brake pads are not included and must be ordered separately. This listing covers the right-hand caliper only.
Specifications
- Part number: XA3J7F1
- Piston diameter: 2x 34 mm and 2x 38 mm
- Number of pistons: 4
- Piston material: Titanium
- Body construction: CNC-machined monoblock
- Pad contact width: 30 mm
- Offset: 22.5 mm
- Fork bolt spacing: 108 mm
- Surface finish: Nickel-plated
- Side: Right only
- Intended use: Race and track only — not approved for road use
- Brake pads: Not included
What's includedEverything in the box▼
- 1x Brembo Racing CNC P4 34/38 Monoblock Brake Caliper Right
FitmentWhich bikes this fits▼
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