SKU: 89384370227

Mono EMB4 Rear Wheel 4-Piston Big Brake Kit

Name: Mono EMB4 Rear Wheel 4-Piston Big Brake Kit
Brand: watersyst.com
SKU: 89384370227
Price: 990.48 USD
Availability: InStock
Rating: 4.0756 (15 reviews)

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Description

Mono EMB4 Rear Wheel 4-Piston Big Brake KitMono Series Rear Axle Monoblock Forged BBK Mono EMB4 Rear 4 Piston Big Brake Kit The Mono EMB4 is a rear axle big brake kit engineered to balance a front upgrade with stable bias, clean pedal modulation, and repeatable stopping power. A 4 piston monoblock forged aluminum caliper drives 30 mm pistons against 28 mm two piece rotors sized 345, 355, or 380 mm with steel or carbon ceramic options to match your build. Why Builders Choose the EMB4 Monoblock

Mono Series · Rear Axle · Monoblock Forged BBK

Mono EMB4 Rear 4-Piston Big Brake Kit

The Mono EMB4 is a rear-axle big brake kit engineered to balance a front upgrade with stable bias, clean pedal modulation, and repeatable stopping power. A 4-piston monoblock forged aluminum caliper drives 30 mm pistons against 28 mm two-piece rotors sized 345, 355, or 380 mm — with steel or carbon-ceramic options to match your build.

Why Builders Choose the EMB4

Monoblock Forged Caliper

One-piece aluminum body for high rigidity and minimal flex under hard rear-axle load.

4-Piston Clamp

30 mm × 4 pistons, 28.3 cm² total piston area per caliper for even pad loading.

Heat-Insulated Pistons

Two-piece pistons reduce heat transfer from pad to fluid, helping pedal feel during repeated stops.

Rear-Bias Friendly

Sized to pair with a larger front BBK without overpowering the rear axle.

Wheel-Package Flexibility

Three rotor diameters and 18 in+ wheel clearance for a wide range of fitments.

Technical Specifications & Kit Options

Brake Caliper
Series	Mono Series
Model / Application	EMB4
Axle Position	Rear
Piston Count	4-piston
Piston Type	Two-piece heat-insulated pistons, no dust boots
Piston Diameter	30 mm × 4
Total Piston Area	28.3 cm² per caliper
Caliper Dimensions	L 268 × W 164 × H 68 mm
Manufacturing Process	Monoblock forged aluminum body
Net Weight	2.55 kg per caliper, without pads
Surface Finish	Nickel-plated
Recommended Wheel Size	18 in or larger
Recommended Rotor Size	Ø345–380 mm × 28 mm
Brake Rotor Options
Rotor Option	Steel (Option A)	Carbon-Ceramic (Option B)
Rotor Material	Heat-treated high-carbon cast iron	Carbon-ceramic composite
Axle Position	Rear	Rear
Rotor Dimensions	Ø345 / 355 / 380 mm × 28 mm	Ø380 mm × 28 mm
Construction	Two-piece assembly	Two-piece assembly
Ventilation	Internally vented	Internally vented
Rotor Mounting	Fixed or floating, by rotor size & application	Floating
Directional Design	Yes — left/right specific	Yes — left/right specific
Rotor Face Pattern	Curved slot / Grain slot / Wave slot / Drilled & slotted	Cross-drilled
Brake Pad Options
Pad Option	For Steel Rotors	For Carbon-Ceramic Rotors
Compatible Rotor Material	Iron / steel rotors only	Carbon-ceramic rotors only
Operating Temperature Range	0–600 °C	0–700 °C
Average Friction Coefficient	μ ≈ 0.38	μ ≈ 0.45
Lines
Brake Line Construction	Three-layer construction
Brake Line Material	PTFE inner liner / SUS304 stainless braid / PVC outer sheath
Brake Line Function	Reduces line expansion for a firmer pedal
Brake Line Fittings	Vehicle-specific on caliper and chassis sides
Brackets
Rotor Hat Manufacturing Process	CNC-machined
Rotor Hat Material	High-strength aluminum alloy
Caliper Bracket Manufacturing Process	CNC-machined
Caliper Bracket Material	Carbon steel
Caliper Mounting Type	Radial mount with vehicle-specific brackets
Fitment & Installation
Minimum Spoke Clearance	101 mm
Recommended Wheel Size	18 in or larger
Rotor Diameter Selection	345, 355, or 380 mm, selected according to vehicle application and wheel clearance
Bedding-In Procedure	Required before aggressive driving

Friction varies with temperature, line pressure, and rotor condition. Always match pads to rotor material.

Package List

Calipers ×2

Two EMB4 rear calipers.

Brake Pads

Matched pads for both rear calipers.

Brake Rotors ×2

Two-piece rotors in your selected size and material.

Caliper Brackets ×2

CNC carbon-steel vehicle-specific brackets.

Rotor Hats ×2

CNC aluminum hats.

Brake Hoses ×2

Stainless braided lines.

Will It Fit? Your 3-Step Check

Confirm wheel inner-barrel clearance, rotor diameter, and vehicle application before ordering. Use the included template or contact us with your wheel and vehicle details.

1. Wheel Diameter

18 in or larger wheels are required.

2. Spoke Clearance

The EMB4 requires at least 101 mm spoke clearance. Larger rotors and certain wheel designs may require more clearance.

3. Vehicle Model

Confirm rotor size, bracket availability, brake line fittings, and rear brake bias for your vehicle before ordering.

It is designed to balance a larger front BBK and deliver clean rear bias without overpowering the chassis.

Installation & Break-In

Caliper mounting: radial mount with vehicle-specific brackets.
Brake line fittings are vehicle-specific on caliper and chassis sides.
Bedding-in procedure is required before aggressive driving.
A proper bed-in transfers an even pad layer to the rotor face, which is critical for bite, modulation, and long-term rotor life.
Confirm wheel inner-barrel clearance, rotor diameter, and vehicle application before ordering.

Frequently Asked Questions

Is the EMB4 a front or rear kit?

Rear-axle only. It is designed to balance a larger front BBK and deliver clean rear bias without overpowering the chassis.

What rotor sizes are available?

Steel rotors come in Ø345, 355, or 380 mm × 28 mm. Carbon-ceramic is offered in Ø380 mm × 28 mm. All are two-piece, internally vented, and directional.

What wheel size do I need?

18 in or larger, with at least 101 mm spoke clearance. Larger rotors and certain wheel designs may require more clearance — verify with a fitment template.

Can I run carbon-ceramic pads on steel rotors?

No. Pads are compound-specific. Use iron/steel pads on steel rotors and CCB-spec pads on carbon-ceramic rotors only.

What's included in the kit?

Two EMB4 rear calipers, two-piece rotors in your selected size and material, matched pads, stainless braided lines, CNC aluminum hats, and CNC carbon-steel vehicle-specific brackets.

Is bedding-in required?

Yes. A proper bed-in transfers an even pad layer to the rotor face, which is critical for bite, modulation, and long-term rotor life.