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Brembo M4 P4 34 High Performance Front Brake Caliper

Cast Monobloc | 108mm Radial Mount | Titanium Grey | Right Side Caliper

Part Number: 120A39720

The Brembo M4 120A39720 is a premium MotoGP-derived right-side radial brake caliper engineered for riders demanding exceptional braking precision, outstanding rigidity, and race-inspired stopping power for aggressive street and track riding. Manufactured using Brembo’s advanced cast monobloc technology, the M4 combines lightweight construction, exceptional hydraulic consistency, and powerful 34mm piston braking performance in one of Brembo’s most iconic high-performance caliper designs.

Finished in Brembo’s signature titanium grey anodized coating with hand-painted red Brembo lettering, the M4 delivers authentic factory superbike aesthetics while incorporating advanced monobloc construction technology derived directly from MotoGP and World Superbike competition.

Item Summary

• Genuine Brembo M4 front brake caliper
• Brembo Part Number: 120A39720
• RIGHT side caliper
• Cast aluminum monobloc construction
• 108mm radial mount spacing
• 22.5mm offset
• 4 × 34mm aluminum pistons
• Titanium grey anodized finish
• Hand-painted red Brembo logo
• Brembo Upgrade Line product
• Brembo brake pads included
• Compatible with 32–34mm disc height
• Lightweight high-rigidity design
• Designed for aggressive street and track riding
• Manufactured in Italy

MotoGP-Derived Monobloc Technology

The Brembo M4 utilizes advanced monobloc technology directly inspired by Brembo’s MotoGP racing experience. The caliper body is manufactured from a single cast aluminum structure, dramatically increasing rigidity while minimizing flex during aggressive braking. Brembo specifically describes the M4.34 as delivering “absolute stiffness” with highly reactive braking performance.

Compared to conventional multi-piece calipers, the monobloc construction provides:

• Improved braking precision
• Sharper lever feel
• Better hydraulic consistency
• Enhanced rider feedback
• Greater resistance to flex under load

The result is exceptionally stable and predictable braking performance under both road and track conditions.

Cast Aluminum Monobloc Construction

The M4 caliper body is manufactured using Brembo’s advanced gravity-casting technology and machined as a single-piece monobloc structure. Brembo developed this technology to combine lightweight construction with exceptional rigidity and operating precision.

Construction Benefits

• Exceptional structural rigidity
• Reduced caliper flex
• Improved braking consistency
• Lightweight performance
• Enhanced modulation
• Race-inspired hydraulic precision

The M4 remains one of Brembo’s benchmark radial calipers due to its excellent balance of performance, reliability, and affordability.

Advanced 4 × 34mm Piston Layout

The Brembo M4 utilizes four 34mm aluminum pistons specifically engineered to deliver immediate braking response, strong stopping power, and exceptional modulation characteristics. Brembo designed the piston configuration to provide uniform braking force across the brake pad surface for optimal performance in all riding conditions.

Performance Benefits

• Strong braking power
• Immediate lever response
• Excellent modulation
• Progressive braking feel
• Improved rider confidence

The piston layout and hydraulic design make the M4 ideal for aggressive street riders, canyon riding, and trackday applications.

Triple Bridge Reinforcement Design

One of the defining visual and structural features of the Brembo M4 is its triple bridge architecture. This reinforced bridge design significantly increases caliper stiffness while reducing deformation under high braking loads.

Benefits Include

• Improved rigidity
• Enhanced braking stability
• Better lever consistency
• Increased rider feedback
• Reduced hydraulic flex

This design became one of the signature engineering elements of Brembo’s modern radial monobloc calipers.

Premium Titanium Grey Finish

The M4 120A39720 features Brembo’s signature titanium anodized finish with hand-painted red Brembo lettering. Brembo’s anodization treatment improves aesthetics and durability while helping protect the caliper body against corrosion and wear.

Finish Benefits

• Premium factory superbike appearance
• Improved corrosion resistance
• Enhanced surface durability
• Authentic Brembo racing aesthetics

Technical Specifications

Included In The Box

• Brembo M4 right-side caliper
• Brembo high-performance brake pads
• Pad anti-vibration spring
• Brembo stickers
• Brembo thermotape temperature strips
• Brembo installation instructions

Key Features

Cast Monobloc Construction

Single-piece monobloc design improves rigidity and braking precision.

4 × 34mm Pistons

Large aluminum pistons provide powerful and progressive braking response.

MotoGP-Derived Brembo Technology

Technology developed directly from Brembo racing experience.

Lightweight High-Performance Design

Advanced casting technology minimizes weight while maximizing rigidity.

Premium Titanium Finish

Titanium anodized coating with red Brembo lettering creates authentic factory superbike styling.

Compatible Brake Pads & Spare Parts

Genuine Brembo Compatible Pads

Replacement Components

Matching Caliper

The complete Brembo M4 left/right caliper kit is sold under part number 220A39710.

Recommended Supporting Components

Recommended Brembo Master Cylinders

For optimal braking feel and hydraulic performance, Brembo commonly recommends:

• Brembo 19RCS
• Brembo 19x18
• Brembo RCS Corsa Corta

These master cylinders maximize braking modulation and rider feedback.

Recommended Brake Rotors

Compatible with:

• Brembo Serie Oro rotors
• Brembo T-Drive rotors
• Brembo SuperSport rotors
• High-performance OEM rotors

Designed for approximately 5.5mm rotor thickness and 32–34mm disc height applications.

Popular Motorcycle Applications

The Brembo M4 120A39720 is commonly installed on:

• Yamaha YZF-R1
• Yamaha YZF-R6
• Ducati Panigale models
• Kawasaki ZX-10R
• Suzuki GSX-R1000
• Honda CBR1000RR
• BMW S1000RR
• Triumph Speed Triple
• Premium naked and superbike builds

Some applications may require spacers or mounting hardware depending on rotor size and fork configuration.

Important Fitment Notes

• Designed for motorcycles utilizing 108mm radial mount spacing
• RIGHT side caliper only
• Compatible with 32–34mm disc height
• Not compatible with ABS systems
• Not compatible with low-band discs
• Some motorcycles require spacers and longer mounting bolts
• Professional installation strongly recommended
• Brake system must be properly bled after installation

Why Choose the Brembo M4 120A39720?

The Brembo M4 remains one of the most respected high-performance radial brake calipers ever produced. Combining MotoGP-derived monobloc construction, powerful 34mm pistons, lightweight cast aluminum architecture, and exceptional braking modulation, the M4 delivers world-class braking performance for aggressive street and track riders alike.

Key Advantages

• MotoGP-derived monobloc technology
• Lightweight cast aluminum construction
• Exceptional braking rigidity
• Powerful 34mm piston design
• Outstanding modulation and rider feedback
• Premium titanium anodized finish
• Genuine Brembo racing pedigree
• Made in Italy craftsmanship

For riders upgrading to a proven high-performance Brembo braking system with authentic superbike styling and exceptional braking feel, the Brembo M4 120A39720 remains one of the finest radial caliper upgrades available today.