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Brembo GP4-RX Radial Caliper vs MOSTPLUS Front Brake Calipers with Bracket

These are not rivals. The Brembo GP4-RX is a high-performance radial-mount caliper for supersport bikes, CNC-machined from billet aluminum in two bolted pieces, nickel-coated, with four 32mm pistons and sintered pads in the box. The MOSTPLUS set is a pair of stock-replacement front calipers for a 2011-2015 Hyundai Sonata or Kia Optima, zinc-plated with 59.94mm pistons and no pads. 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 Hyundais and Kias. Owners praise the Brembo's feel and consistency; MOSTPLUS buyers care about fit and a working brake, not performance.

  • Choose the Brembo GP4-RX if you ride a supersport with 108mm radial mounts and want stronger, more consistent braking with sintered pads included and TÜV/KBA approval for street use.
  • Choose the MOSTPLUS set if you drive a 2011-2015 Sonata or Optima and need a direct-fit replacement front caliper pair with brackets, not a performance upgrade.

Prices

  • Brembo GP4-RX Radial Caliper: $755.00 at NiceCycle.com (last seen Nov 2)
  • MOSTPLUS Front Brake Calipers with Bracket: $70.99 at Walmart (last seen Nov 9)
  • Difference: the MOSTPLUS Front Brake Calipers with Bracket is $684.01 cheaper than the Brembo GP4-RX Radial Caliper at the latest prices (Nov 2 and Nov 9)
Brembo
Brembo GP4-RX Radial Mount Caliper 108mm

Brembo GP4-RX Radial Caliper

Brembo GP4-RX Radial Mount Caliper 108mm

$755.00at NiceCycle.comChecked Nov 2
See all prices and details
Visit NiceCycle.com
Pros
  • Four-piston radial caliper with strong, linear feel
  • Two-piece CNC billet body resists flex under hard braking
  • Sintered pads included, ready to install
  • TÜV/KBA approval covers many street models
  • Nickel finish sheds heat and resists corrosion
Cons
  • Fits only 108mm radial-mount forks
  • Needs a matching master cylinder and lines to get the most from it
  • Not a bolt-on for older axial-mount bikes
  • Higher-end part demands correct bedding-in and fluid
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 19 h ago
See all prices and details
Visit Walmart
Pros
  • Direct fit for listed Sonata and Optima years and trims

What separates them

Brembo GP4-RX Radial CaliperMOSTPLUS Front Brake Calipers with Bracket
Vehicle typeMotorcycle front caliper, radial mountPassenger car front caliper pair
ConstructionTwo-piece CNC-machined billet aluminum, boltedCast body, zinc plated
Pistons4 x 32mm aluminum, double seal for road useSingle 59.94mm piston, phenolic or metal by application
Pads includedYes, sintered 07BB3793No
Mounting hardwareCaliper kit; brackets vary by bikeMounting brackets included, hardware not
Street legalityTÜV and KBA approval for many modelsNot applicable; OEM replacement fitment
FinishNickel coating for heat dissipation and looksZinc plating for corrosion resistance
Fitment scopeSupersport bikes with 108mm hole spacing (CBR, ZX-10R, GSX-R, R1, R6)Specific 2011-2015 Sonata and Optima engine/trim combinations

Price history

$1,799.95$99.69
Nov 1Nov 10
  • Brembo GP4-RX Radial Caliper: lowest $755.00 on Nov 2 at NiceCycle.com; $1,571.00 on Nov 10.
  • MOSTPLUS Front Brake Calipers with Bracket: lowest $99.69 on Nov 8 at Amazon.

Prices at every store

Brembo GP4-RX Radial Caliper

  • BobleisureNew

    In stock

    $1,798.95Free shippingChecked 37 min ago
    Visit Bobleisure
  • NiceCycle.comNew

    Availability unknown

    $755.00Checked Nov 2
    Visit NiceCycle.com
  • eBayNew

    Availability unknownSold by automech-qz (100% positive, 84 ratings)Ships from China · 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.

    $826.96Free shippingChecked Nov 9
    Visit eBay
  • TGP MotoRacingNew

    Availability unknown

    $1,571.50Checked Nov 2
    Visit TGP MotoRacing

Also available at

  • eBayCheck price at eBay

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All 18 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 19 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 GP4-RX Radial CaliperMOSTPLUS Front Brake Calipers with Bracket
Mounting pitch108mm / 100mm / 130mm—
Piston diameter32mm (same diameter 4-pot)—
Piston materialAluminum—
Body materialAluminum alloy (CNC machined, 2-piece)—
Surface treatmentNickel coating—
Mounting PositionFront—
Caliper Body2-Pieces—
Pistons Diameter4 x 32 mm—
Disc swept height32-34 mm—
MaterialBillet Aluminium—
Surface protectionNickel coating—
Weight without pads1000 g—
Show all 15 specsShow fewer specs
SpecBrembo GP4-RX Radial CaliperMOSTPLUS Front Brake Calipers with Bracket
Offset22.5 mm—
number_of_pieces—1
color—Silver

What reviewers say

Brembo GP4-RX Radial Caliper

Owners of race-derived Brembo radial calipers generally rate the build and braking feel highly, and the GP4-RX's street approval is a common reason to choose it. Fewer detailed long-term reports exist for this exact part than for the older GP4-RR.

What people mention
  • Braking powerPraisedRiders describe strong stopping power and easy modulation with the four-piston design.
  • Build qualityPraisedThe CNC two-piece body and nickel finish are called out as precise and durable.
  • Street legalityPraisedTÜV/KBA approval is a main draw for riders who want race hardware on the road.
  • WeightMixedAt about 1,000 g without pads it is not lighter than every stock caliper.

Questions and answers

Which is better for track riding?
The Brembo GP4-RX. Its rigid two-piece billet body, four 32mm pistons and sintered pads give firmer, more consistent braking under repeated hard use. The MOSTPLUS calipers are stock replacements for a family sedan.
Will the Brembo fit my bike?
Only if your forks have 108mm radial mounting spacing and the caliper's offset and disc swept height match your rotors. Check your model against the TÜV/KBA approval list before buying.
Will the MOSTPLUS calipers fit my car?
Only the specific 2011-2015 Sonata and Optima combinations listed, and the piston type must match your original (phenolic or metal). Confirm your year, engine and suspension before ordering.
Which lasts longer?
Both last with maintenance, but they wear differently. The Brembo's seals and nickel finish hold up well under heat; the MOSTPLUS zinc-plated cast calipers are fine for normal street duty but are not built for track heat cycles.
Is the Brembo worth stepping up to over a stock caliper?
If you ride a supersport hard, yes: better feel, less flex and consistent braking are real gains. If you just commute, a well-maintained stock caliper is enough.
Do I need extra parts with either?
The Brembo includes pads but may need new lines, fluid and a compatible master cylinder. The MOSTPLUS includes brackets but no pads or hardware, so budget for those.

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More comparisons

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

Buying guides that pick them

  • Best 108mm brake calipers
  • Pair of calipers with mounting brackets
  • Zinc plating resists rust
  • Phenolic or metal piston options match the original setup
    • Cons
    • No brake pads or mounting hardware in the box
    • Stock replacement performance only
    • Fitment is narrow and trim-specific; wrong piston type causes problems
    • Single-piston sliding design, not a performance upgrade