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Brembo M4 Monobloc Radial Caliper vs MOSTPLUS Front Brake Calipers with Bracket

These are not rivals. The Brembo M4 is a cast monobloc radial caliper for sportbikes, sold as a pair, and it is a performance upgrade. The MOSTPLUS set is a stock replacement for 2011-2016 Hyundai Sonata and Kia Optima front brakes, sold as a pair with brackets. Buy the Brembo for track or fast road riding on a bike with 108mm radial mounts. Buy the MOSTPLUS to restore a worn factory caliper on those sedans. Owners rate the Brembo for feel and consistency; MOSTPLUS buyers rate it as a budget replacement, not an upgrade.

  • Choose the Brembo M4 if you ride a sportbike with 108mm radial fork mounts and want firmer, more consistent braking for track days or hard road use.
  • Choose the MOSTPLUS set if you drive a 2011-2016 Sonata or Optima and need to replace a seized or leaking front caliper with a stock-fit part.

Prices

  • Brembo M4 Monobloc Radial Caliper: $395.89 at Omnia Racing Special Parts (last seen Nov 9)
  • MOSTPLUS Front Brake Calipers with Bracket: $70.99 at Walmart (last seen Nov 9)
  • Difference: the MOSTPLUS Front Brake Calipers with Bracket is $324.90 cheaper than the Brembo M4 Monobloc Radial Caliper at the latest prices (Nov 9)
Brembo
Brembo M4 Monobloc Radial Caliper 108mm

Brembo M4 Monobloc Radial Caliper

Brembo M4 Monobloc Radial Caliper 108mm

$395.89at Omnia Racing Special PartsChecked 20 h ago
See all prices and details
Visit Omnia Racing Special Parts
Pros
  • Monobloc body flexes less under hard braking than a two-piece caliper
  • Radial mount bolts straight to 108mm forks
  • Sintered pads and hardware included
  • Uses common Ducati 1098/1198 pad shape
  • Consistent lever feel on track
Cons
  • Fits only radial-mount forks, not axial
  • Needs a 19x18 or 19x20 master cylinder to work at its best
  • No dust seals, so it needs regular cleaning on a road bike
  • Must confirm disc diameter and height before buying
MOSTPLUS
MOSTPLUS Set(2) Front Side Brake Calipers w/ Bracket

MOSTPLUS Front Brake Calipers with Bracket

MOSTPLUS Set(2) Front Side Brake Calipers w/ Bracket

4(2 ratings)
$70.99at WalmartChecked 20 h ago
See all prices and details
Visit Walmart
Pros
  • Direct stock fit for listed Sonata and Optima years
  • Brackets included
  • Zinc plating resists corrosion
  • One-year warranty
  • Piston type matched to the application
Cons
  • No pads or mounting hardware in the box
  • Phenolic and metal piston versions are not interchangeable; ordering the wrong one is easy
  • Sliding caliper, not a performance upgrade
  • Fits only the listed Hyundai and Kia models

What separates them

Brembo M4 Monobloc Radial CaliperMOSTPLUS Front Brake Calipers with Bracket
Vehicle typeMotorcycle front brakePassenger car front brake
Fitment108mm radial mount, most Japanese sportbikes; 100mm version for European bikesSpecific to 2011-2016 Hyundai Sonata and Kia Optima, with piston type varying by year and trim
ConstructionCast aluminum monobloc body, four 34mm aluminum pistonsZinc-plated sliding caliper with a single 59.94mm piston, phenolic or metal by application
Pads and hardwareBrembo M4 sintered pads included, mounting hardware includedNo pads, no mounting hardware; brackets and copper washers included
Disc compatibility310-330mm discs, 4.5-5.5mm thick, 32-34mm disc heightStock Sonata/Optima front rotors only
Intended useRacing and performance upgradeStock replacement
WeightAbout 1.015kg per caliperAbout 20.5 lbs for the set
WarrantyBrembo's standard product warrantyOne year

Price history

$1,412.00$99.69
Nov 1Nov 10
  • Brembo M4 Monobloc Radial Caliper: lowest $395.89 on Nov 10 at Omnia Racing Special Parts.
  • MOSTPLUS Front Brake Calipers with Bracket: lowest $99.69 on Nov 8 at Amazon.

Prices at every store

Brembo M4 Monobloc Radial Caliper

  • Omnia Racing Special PartsNew

    In stock

    $395.89+ $30.00 shippingChecked 20 h ago
    Visit Omnia Racing Special Parts
  • eBayNew

    Availability unknownSold by omnia-racing (96.8% positive, 35,200 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.

    $351.00+ $45.00 shippingChecked Nov 9
    Visit eBay
  • MotoHorseNew

    Availability unknown

    $426.50Checked Nov 2
    Visit MotoHorse
  • Brock's PerformanceNew

    Availability unknown

    $749.00Checked Nov 1
    Visit Brock's Performance

Also available at

  • eBayCheck price at eBay

Store links may earn us a commission.

All 7 stores and price history →

MOSTPLUS Front Brake Calipers with Bracket

  • WalmartNew

    In stockSold by Jonger INCReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $70.99Free shippingChecked 20 h ago
    Visit Walmart
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $99.69Free shippingChecked Nov 8
    Visit Amazon
All 2 stores and price history →

Specs compared

SpecBrembo M4 Monobloc Radial CaliperMOSTPLUS Front Brake Calipers with Bracket
ColorBlackSilver
Vehicle CompatibilityMotorcycle—
ApplicationUpgrade—
TypeCaliper—
SubtypeBrake caliper—
Quantity2 (calipers kit)—
Friction Material TypeSintered—
FunctionBraking—
DurabilityDurable—
Number Of Outlets1 (single banjo bolts)—
Bolt Pattern108 mm—
SizeOne Size—
Show all 40 specsShow fewer specs
SpecBrembo M4 Monobloc Radial CaliperMOSTPLUS Front Brake Calipers with Bracket
Thread Sizem10 x 1.0 (double banjo)—
Diameter310 - 330 mm (suitable for disc diameter)—
Height32-34 mm (Disc height)—
Piston Diameter34 mm—
MaterialCast aluminium, Aluminium (Piston material)—
Design HighlightsMonoblock—
Mounting Hardware IncludedYes (Mounted pads included)—
Mounting TypeRadial mount spacing 100 mm—
Typical UsersGeneral public—

What reviewers say

Brembo M4 Monobloc Radial Caliper

Owners of the M4 caliper describe a firm lever and strong, consistent braking on track, with the monobloc body holding up under repeated hard stops. Complaints center on cost and on fitment, since the 108 mm spacing does not suit every fork.

What people mention
  • Braking powerPraisedRiders report strong, consistent stopping power with the included sintered pads.
  • Lever feelPraisedOwners describe a firm, predictable lever with little fade on track.
  • BuildPraisedThe monobloc aluminum body is seen as stiff and well made.
  • FitmentCriticisedThe 108 mm radial spacing does not fit 100 mm forks without adapters.

Questions and answers

Can I put the Brembo M4 on a bike with axial mounts?
No. It needs radial fork mounts at 108mm centers, or 100mm on the other version. Axial forks need an adapter or a different caliper.
Does the MOSTPLUS set fit any car other than the Sonata and Optima?
No. It is listed only for 2011-2016 Sonata and Optima variants, and the correct piston type depends on year, engine and suspension.
Which lasts longer?
The Brembo is built for racing and lasts with regular seal and pad service. The MOSTPLUS is a stock replacement; its sliding pins and seals wear like any factory caliper.
Is the Brembo worth stepping up to over a stock caliper?
On a sportbike used hard, yes: less flex and better pad choice. For commuting only, a rebuilt stock caliper does the job.
Do I need a new master cylinder with the Brembo?
Brembo specifies a 19x18 or 19x20 master cylinder. A stock master may feel soft or over-travel with the four 34mm pistons.
Are pads included with both?
The Brembo ships with sintered pads. The MOSTPLUS does not include pads, so budget for a set.

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More comparisons

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  • Brembo M4 Monobloc Radial Caliper 108mm vs Brembo GP4-RS 108MM Caliper 220C78310
  • Brembo GP4-RX Radial Mount Caliper 108mm vs MOSTPLUS Set(2) Front Side Brake Calipers w/ Bracket

Buying guides that pick them

  • Best 108mm brake calipers
Pitch
100mm / 108mm
—
Piston materialAluminum—
Body materialAluminum alloy (Cast, monoblock)—
Caliper Body TypeMonoblock—
Mounting108mm Radial (suitable for most Japanese bikes)—
Pads typeBrembo M4 sintered performance pads included—
Pistons Diameter4 x 34 mm—
Banjo bolts/washers2 x single M10 x 1.00 included—
Disc swept height: 32-34 mm—
Surface protectionTitanium anodic oxidation—
Weight without pads738 g—
Disc diameters300 to 330 mm—
Automotive brake typeDisc Brakes—
Vehicle fitment typeSpecific—
Vehicle mount locationLeft—
BrandBrembo—
Vehicle modelBRE220A39710—
Count1—
Has written warrantyNo—