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Brembo Racing M4 Radial Caliper Kit vs Nowaskey Six Piston Radial Caliper

The Brembo M4 is a race-derived four-piston monoblock pair built for sport bikes with 108mm radial mounts and 310–330mm discs. The Nowaskey is a single six-piston caliper made to convert a Harley front end from axial to radial mounting. Brembo has the deeper racing pedigree and a matched left/right set; Nowaskey offers more pistons and a direct Harley fitment path. Buy Brembo for track-grade feel and consistency, Nowaskey for a Harley radial conversion.

  • Choose the Brembo M4 if you ride a sport bike with 108mm radial fork mounts and want a matched left/right monoblock set with racing heat management.
  • Choose the Nowaskey if you have a Harley with axial front calipers and want a radial-mount six-piston upgrade with the hardware included.

Prices

  • Brembo Racing M4 Radial Caliper Kit: $562.43 at eBay (last seen Nov 9)
  • Nowaskey Six Piston Radial Caliper: $524.95 at Kruesi Originals (last seen Nov 2)
  • Difference: the Nowaskey Six Piston Radial Caliper is $37.48 cheaper than the Brembo Racing M4 Radial Caliper Kit at the latest prices (Nov 2 and Nov 9)
Brembo
Brembo Radial Monoblock Caliper Kit M4 34/34 108mm Left/Right Set

Brembo Racing M4 Radial Caliper Kit

Brembo Radial Monoblock Caliper Kit M4 34/34 108mm Left/Right Set

4(1 rating)
$562.43at eBayChecked Nov 9
See all prices and details
Visit eBay

Store links may earn us a commission.

Pros
  • Monoblock body gives high rigidity and consistent lever feel
  • Matched left/right set covers both front calipers
  • Racing-derived heat control for track use
  • Mounted pads included, ready to install
  • Brembo racing pedigree and parts support
Cons
  • Requires professional racing-level installation skill
  • Only fits 108mm radial mounts and 310–330mm discs
  • Four pistons versus six on the rival
Nowaskey
Nowaskey Six Piston Machined 108mm Radial Caliper for Harley

Nowaskey Six Piston Radial Caliper

Nowaskey Six Piston Machined 108mm Radial Caliper for Harley

$524.95at Kruesi OriginalsChecked Nov 2
See all prices and details
Visit Kruesi Originals
Pros
  • Six-piston differential bore for strong, progressive bite
  • Converts Harley axial front ends to radial mounting
  • Rigid dual-bridge billet body
  • Chrome Grade 8 hardware in the box
  • Direct Harley-Davidson fitment focus
Cons
  • Sold as a right-side caliper only
  • No disc size or pad compound details given
  • Less racing track record than Brembo

What separates them

Brembo Racing M4 Radial Caliper KitNowaskey Six Piston Radial Caliper
Piston countFour 34mm pistons per caliperSix pistons with differential bore sizing
ConstructionCNC-machined monoblock aluminum bodyCNC-machined 6061 billet aluminum dual-bridge body
Mounting108mm radial mount, left and right pair108mm radial mount, right side only
Fitment targetSport bikes with radial fork bottomsHarley-Davidson front ends converting from axial
Disc compatibilitySpecified for 310–330mm discs, 32–34mm heightNot specified in the listing
Included hardwareMounted pads includedCaliper plus chrome Grade 8 hardware
Heat managementRacing heat adhesives to control operating temperatureNot described
FinishBlack hard anodizedMachined billet finish

Price history

$877.49$524.95
Nov 2Nov 13
  • Brembo Racing M4 Radial Caliper Kit: lowest $750.95 on Nov 2 at Bobleisure; $752.95 on Nov 10.
  • Nowaskey Six Piston Radial Caliper: lowest $524.95 on Nov 2 at Kruesi Originals; $525.00 on Nov 13.

Prices at every store

Brembo Racing M4 Radial Caliper Kit

  • Motardinn.comNew

    In stockShips from abroad · duties may apply

    $888.49+ $16.99 shippingChecked Nov 10
    Visit Motardinn.com
  • Addiction MotorsportNew

    In stockShips from the UK · duties may apply

    $978.92+ $60.35 shippingChecked Nov 9
    Visit Addiction Motorsport
  • eBayNew

    Availability unknownSold by wrs_italy (99.5% positive, 21,400 ratings)Ships from Italy · duties may applyReturns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $562.43+ $86.81 shippingChecked Nov 9
    Visit eBay
  • BobleisureNew

    Availability unknownShips from abroad · duties may apply

    $752.95Free shippingChecked Nov 10
    Visit Bobleisure

Store links may earn us a commission.

All 13 stores and price history →

Nowaskey Six Piston Radial Caliper

  • Nowaskey Extreme PerformanceNew

    In stock

    $525.00Free shippingChecked Nov 13
    Visit Nowaskey Extreme Performance
  • Kruesi OriginalsNew

    Availability unknown

    $524.95Checked Nov 2
    Visit Kruesi Originals
All 2 stores and price history →

Specs compared

SpecBrembo Racing M4 Radial Caliper KitNowaskey Six Piston Radial Caliper
Vehicle CompatibilityStreet Motorcycle—
ApplicationSports driving, High-performance road use—
TypeCaliper—
Kit ContentsPads—
SubtypeBrake Caliper—
Quantity2 (Units per box)—
Braking PowerPerformance, High-performance—
Friction Material TypeNew brake pad compounds—
FunctionBraking—
DurabilityHard anodized (surface protection)—
Temperature RatingHeat adhesives used in racing to control calipe…—
SizeOne Size—
Show all 23 specsShow fewer specs
SpecBrembo Racing M4 Radial Caliper KitNowaskey Six Piston Radial Caliper
Diameter310 - 330 mm (suitable for disc diameter)—
Height32-34 mm (disc height)—
Piston Diameter34 mm—
Width32-34 mm (Surface)—
MaterialAluminium (piston), Aluminium (Caliper)—
ColorBlack—
Design Highlights4 pistons—
Mounting Hardware IncludedYes (Mounted pads included)—
Mounting TypeRadial Mount—
Skill Level

What reviewers say

Brembo Racing M4 Radial Caliper Kit

Owners describe these calipers as a transformative upgrade for motorcycle braking, offering MotoGP-level stopping power and exceptional feel. They are praised for their consistent deceleration and reliability during high-performance use.

What people mention
  • Stopping powerPraisedUsers report powerful, MotoGP-level deceleration that transforms the bike's braking capabilities.
  • Build qualityPraisedThe CNC-machined monoblock aluminum construction provides ultimate rigidity and precision.
  • Heat managementPraisedThe design and materials allow for excellent heat dissipation during aggressive track use.

Questions and answers

Which is better for track days?
The Brembo M4. It is a race-derived monoblock with matched left and right calipers and heat-control features aimed at sustained hard braking.
Will the Nowaskey fit my Harley?
It is built for Harley front ends converting from axial to 108mm radial mounts. Confirm your fork bottoms and disc offset before ordering, since it is a right-side caliper only.
Which lasts longer?
Both use machined aluminum bodies that hold up well. Brembo's hard anodizing adds surface protection; Nowaskey's longevity depends on pad choice and fluid maintenance.
Is the Brembo worth stepping up to over the Nowaskey?
For a sport bike on track, yes: matched calipers, racing heat management and proven consistency. For a Harley cruiser conversion, the Nowaskey is the more direct fit.
Do I need different master cylinders?
Piston count and bore change hydraulic ratio. A four-piston Brembo and a six-piston Nowaskey can both alter lever travel, so match the master cylinder to the caliper.
Can I run the Brembo on a Harley?
Only if the fork has 108mm radial mounts and the disc falls in the 310–330mm range. Most Harleys need the axial-to-radial conversion the Nowaskey is made for.

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More comparisons

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  • Brembo GP4-RS Caliper vs Nowaskey Six Piston Machined 108mm Radial Caliper for Harley
Highly qualified and competent professionals wo…
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