Monoblock Forged Caliper
One-piece aluminum body for high rigidity and minimal flex under hard rear-axle load.
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Ships within 48 hours · Estimated delivery Jul 23 - Jul 28
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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
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.
Ready to spec your EMB4 build?
Need help confirming wheel clearance, rotor size, or bracket availability for your vehicle?
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
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★★★★★ 5
Great Sheets!
Size: Twin, Color: Oatmeal
Super soft, wash up beautifully, seem well made — very happy! It’s very hard to find 100% cotton t-shirt type sheets and these are really lovely.
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Reviewed in the United States on June 1, 2026
★★★★★ 3
Weirdly textured
Size: King, Color: Dark Gray
I have bought and loved jersey sheets in the past, that have all been as soft as a well worn cotton t-shirt. These arent soft. They have the stretch of jersey, but not the soft smooth texture that they should have. Even after washing a few times these are one of my least favorite sheets I've ever bought on Amazon.
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Soft, Breathable Sheets That Feel Great to Sleep On
Size: Twin, Color: White
This Amazon Basics jersey sheet set was a really good purchase. The cotton material is soft, stretchy, and breathable — it feels like sleeping in a comfortable T‑shirt. The fitted sheet has a nice snug fit that stays in place, and the flat sheet is lightweight without feeling flimsy.
The fabric washes well, doesn’t pill, and stays soft after multiple loads. It’s a great everyday sheet set for anyone who likes that cozy, relaxed jersey feel. Overall, comfortable, easy to care for, and great value for the price.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
The Perfect Sheets To Lie On While Writing Amazon Reviews
Size: Full, Color: Light Gray
As I write this, I am laying on an adjustable full sized bed by Hofish and a 10.5" comfort foam mattress by Classic Brands. I know I sound like I am an Amazon plant, but I swear I am not. I'm not even a stockholder anymore.
This is the most awesome bed stylings combination I have had in many, many years. In fact, it is the best I have ever owned and it is beat only by some ritzy resort I stayed at on vacation like 20 years ago, though I admit I was pretty drunk the entire time so my memory might not be the most accurate.
But getting back to today... these sheets are great. I washed them twice - I'm not a neat freak, I am just amazingly disorganized and easily distracted while doing laundry, so tonight they went though two wash cycles and one dry. And then I put them on the bed. While these sheets are not deep pocket sheets, they don't need to be with this mattress. There is enough room and border for them to tuck and wrap with the elastic to give a strong grip under the mattress, which is important as the adjustable frame continually put the sheets and mattress though its repeated adjustable calesthenics-type positioning. The other two sheet sets I have used since I got this bed have struggled poorly with this. In the day or so and at least a dozen position changes, these sheets stay in place with no popped corners to exposing the bowl as the head and feet rise. Of course, till will tell if it lasts, but so far they are the best of the batch of sheets in my closet.
As for texture, they are awesome. I'm a dude. I don't really know what thread count or knit or whatever really means. But these sheets feel like a well-washed favorite, quality rock & roll concert t-shirt. And not one of these glitter puff stupid new groups, like a real rock band from the 80s that now charges $250 for a concert ticket and $60 for a t-shirt...but that group you saw back then, paid $10 for the shirt and you STILL have it and love to wear it because it is perfectly molded to your body, soft and reliable. The kind of shirt you will wear under your suit at work and just grin not just for mental middle finger to corporate dress codes, but because the t-shirt is just that great of a feeling.
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In LA right now we are having a nasty heat wave, but these sheets don't seem to bake me even with my stuttering AC. The flannel sheets I love seem to trigger the butt sweats as soon as I lay down in this heat, but no such problem with these.
So really, I'm absolutely happy with these things. I am going to order more in other colors as soon as Amazon gets them back in stock. Great price, great quality, great comfort, great fit, great deal. It is that simple.
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Reviewed in the United States on September 3, 2017
★★★★★ 5
Soft smooth and wrinkle free!
Size: King, Color: White
The most comfortable sheets I’ve had in years! Soft and don’t wrinkle up in the bed. Some reviews said they are thin but I think they’re perfect! I don’t want super thick sheets as we are hot sleepers. These are the perfect feel. They also stretch very well to fit on my mattress all the way around and I have a thick mattress! My precious sheets were a struggle to get over the corners but these fit perfectly. Would buy 10 times over! Such a good value as well!
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Reviewed in the United States on April 14, 2026