Brembo Racing GP4-RR Monoblock Brake Caliper Kit 108mm XB9L2A1
02 · Data & docs

The facts.

Technical data
Part numberXB9L2A1
Caliper typeMonoblock, radial mount
Caliper body materialHard-anodised aluminium
Number of pistons4 (2x 32 mm, 2x 36 mm)
Piston materialTitanium
Offset30 mm
Fork mounting pitch108 mm
Maximum disc thickness7.25 mm
Brake fluid compatibilityDOT 4, DOT 5.1
Intended useRacing and trackday only — not road-legal
DescriptionThe whole story▼

For riders who demand absolute stopping authority on track, the Brembo GP4-RR Monoblock Brake Caliper Kit represents the pinnacle of racing brake technology. Engineered exclusively for circuit use, this 108mm kit combines a one-piece aluminium body with four titanium pistons and purpose-built thermal management — delivering the progressive, fade-resistant braking feel that separates podium finishes from also-rans. Important: this caliper kit carries no road-use homologation and is intended solely for racing and trackday applications.

Key Features

  • Monoblock aluminium construction — the one-piece body eliminates flex between bolt faces, providing a direct, consistent lever feel under repeated hard braking
  • Four titanium pistons (2x Ø32 mm, 2x Ø36 mm) — titanium's low thermal conductivity shields the brake fluid from heat soak, preserving pedal firmness deep into a braking zone
  • Hard-anodised caliper body — the hard-coat finish resists abrasion, corrosion and heat discolouration through the most demanding track sessions
  • Advanced cooling geometry — the caliper profile is designed to channel airflow and dissipate heat rapidly, reducing the risk of fluid vaporisation under racing conditions
  • Compatible with DOT 4 and DOT 5.1 brake fluid — gives the technician flexibility to select the fluid that best suits ambient and track temperatures
  • 30 mm offset and 7.25 mm maximum disc thickness — precise dimensional specification ensures correct disc clearance with matched Brembo racing discs

Purpose-Built Racing Performance

The GP4-RR sits at the top of Brembo's monoblock racing caliper range, developed directly from MotoGP and World Superbike programmes. Where multi-piece calipers rely on bolted halves, the monoblock design machines the entire body from a single billet of aluminium, removing any possibility of inter-body movement under peak clamping loads. The result is a brake that communicates crisply through the lever, allowing the rider to modulate braking pressure with surgical precision — lap after lap, session after session.

Thermal Control on Track

Heat is the enemy of braking performance. The GP4-RR addresses this through a combination of titanium pistons, which insulate the fluid from caliper body temperature, and a cooling-optimised body profile. Together these features allow consistent braking behaviour even at circuits with extended, high-speed braking zones. The hard-anodised surface treatment further protects the aluminium body against the thermal cycling that can degrade lesser calipers over a full race season.

Fitment and Compatibility

The Brembo GP4-RR Monoblock Brake Caliper Kit XB9L2A1 is designed for forks with a 108 mm axle-to-caliper mounting hole pitch. This specification is common to a wide range of supersport and superbike platforms, including but not limited to:

  • Honda CBR 600 RR, CBR 1000 RR, CBR 1000 RR-R
  • Kawasaki ZX-6R, ZX-10 R, ZX-10 RR
  • Yamaha R6, R1, R1M
  • Suzuki GSX-R 600, GSX-R 750, GSX-R 1000
  • Ducati 848, 899, 959, 1199, 1199 S, 1199 R, 1299, 1299 S
  • Aprilia RSV4, RSV4 R, RSV4 RR, RSV4 RF, 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 fork mounting pitch and disc thickness on your specific machine before fitting. For use on track only — not approved for road use.

Compatible Spare Parts

  • Bleed screw: part number 05281233
  • Brembo bleed screw protection cap: part number 05150220

Specifications

Attribute Detail
Part number XB9L2A1
Caliper type Monoblock, radial mount
Caliper body material Hard-anodised aluminium
Number of pistons 4 (2x 32 mm, 2x 36 mm)
Piston material Titanium
Offset 30 mm
Fork mounting pitch 108 mm
Maximum disc thickness 7.25 mm
Brake fluid compatibility DOT 4, DOT 5.1
Intended use Racing and trackday only — not road-legal
What's includedEverything in the box▼
  • 1x Brembo GP4-RR Brake Caliper Kit (brake pads not included)
FitmentWhich bikes this fits▼
07 · Support

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08 · Paddock

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